#TD-150 Modification Series
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Building the AAP12, Thorens TD-150 Modification Part Three
Herein we continue the tale of two turntables as introduced in Part One. When you haven’t seen the collection introduction, you could wish to do so now. In Part Two we constructed a TD-150 in a Maple wood plinth utilizing principally inventory elements. And now, finally, it’s time to build our LP12 clone, hereafter the AAP12, and mod it to the max.
<img data-attachment-id="1519" data-permalink="https://www.audioappraisal.com/thorens-td-150-rebuild-modification-part-one/aap12-original-top-view-with-platter/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?fit=3024%2C4032&ssl=1" data-orig-size="3024,4032" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1550758051","copyright":"","focal_length":"three.99","iso":"100","shutter_speed":"zero.058823529411765","title":"","orientation":"1"" data-image-title="Aap12 Original Top View With Platter" data-image-description="
Aap12 Unique Prime View With Platter
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?fit=225%2C300&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?fit=768%2C1024&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?resize=225%2C300&ssl=1″ alt=”Aap12 Unique Prime View With Platter” width=”225″ peak=”300″ class=”aligncenter size-medium wp-image-1519″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3377362314″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
As earlier than, stripping the donor deck was the first port of name. This deck was in significantly higher situation with the unique wooden plinth. I’m not a fan of the plinth. I feel it’s unnecessarily bulky and I’m not eager on the dust cowl design. I also don’t look after the method the prime plate sits pleased with the prime plinth frame. We will definitely do better.
<img data-attachment-id="1513" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-original-close-up-of-top-plate/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1550757987","copyright":"","focal_length":"three.99","iso":"40","shutter_speed":"zero.04","title":"","orientation":"1"" data-image-title="Aap12 Original Close Up Of Top Plate" data-image-description="
Aap12 Unique Close Up Of Prime Plate
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Unique Shut Up Of Prime Plate” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1513″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3809853746″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
Throughout disassembly I was interested to notice the design of the bearing. As an alternative of a captive ball as on the majority of TD-150 MK II fashions, this bearing ends in a machined conical level. I mentioned this to mark of Vinyl Ardour, who informed me that this superior bearing was used in the unique MK I model. After a little bit of digging I discovered a number of other MK II house owners with the similar bearing, which makes me ponder whether Thorens briefly carried the design over, or used up some surplus element inventory during the initial run of the updated models.
Further analysis means that this design was actually adopted after the captive ball design, and was introduced for the TD-125 MK II and TD-160 to enable the bearing shaft and housing to be shared between fashions. Incidentally it’s in all probability no coincidence that Linn’s single-point LP12 bearing just isn’t dissimilar in design, albeit bigger.
<img data-attachment-id="1499" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-glued-together/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1555691823","copyright":"","focal_length":"three.99","iso":"40","shutter_speed":"zero.041666666666667","title":"","orientation":"6"" data-image-title="Aap12 Glued Together" data-image-description="
Aap12 Glued Together
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Glued Together” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1499″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3494875605″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
A new plinth was then assembled from 23 mm thick Cherry. As with the Maple plinth partially two, the corners are mitred and glued and the braces are glued in place, with a 10 mm rebate for the baseboard and the prime plate inset by 3 mm. The thickness of the board necessitated some rebated battens be machined to help the prime plate whereas making the plinth giant sufficient to carry a standard-sized hinged dust cover. This was a distinction of a Meer two millimetres, however I might attempt to use thicker wooden in future.
<img data-attachment-id="1496" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-cut-outs-and-holes-drilled-in-plinth/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1555953184","copyright":"","focal_length":"3.99","iso":"50","shutter_speed":"0.066666666666667","title":"","orientation":"1"" data-image-title="Aap12 Cut Outs And Holes Drilled In Plinth" data-image-description="
Aap12 Reduce Outs And Holes Drilled In Plinth
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Minimize Outs And Holes Drilled In Plinth” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1496″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1582759720″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
As earlier than, the outward-facing edges of the triangular braces have been machined with clearance slots for the arm, motor and energy change cables utilizing a gap noticed mounted in a pillar drill, which allows a half circle to be cleanly minimize without utilizing the centre information bit.
<img data-attachment-id="1489" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-base-on/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557671212","copyright":"","focal_length":"3.99","iso":"40","shutter_speed":"0.058823529411765","title":"","orientation":"1"" data-image-title="Aap12 Base On" data-image-description="
Aap12 Base On
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Base On” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1489″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1449033498″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The baseboard is similar to that of the Maple plinth, constructed from a laminated plywood shower panel at a fraction over 10 mm in thickness. 24 mm Recesses allowed the ft to knock in tightly, and 24 mm access holes have been drilled for the suspension bolts and chassis bolts.
<img data-attachment-id="1493" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-metal-support-t-bar/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557568766","copyright":"","focal_length":"3.99","iso":"40","shutter_speed":"0.033333333333333","title":"","orientation":"6"" data-image-title="Aap12 Close Up Of Metallic Help ‘t’ Bar" data-image-description="
Aap12 Close Up Of Metallic Help ‘t’ Bar
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?fit=1024%2C768&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Close Up Of Metallic Help ‘t’ Bar” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1493″ data-recalc-dims=”1″ data-pagespeed-url-hash=”249940617″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The LP12 has a cross member spanning the depth of the plinth between the two prime plate mounting blocks. That is used to carry the power provide and wiring, but I needed to take the design one step additional. A T-shaped construction was constructed from aluminium and bolted into place, spanning the depth of the plinth and persevering with throughout to its right-hand aspect.
A standard drawback with the LP12 prime plate is that it has a tendency to sag in the center at the right-hand aspect, closest to the arm board because of the weight of the hanging sub-chassis. The Vinyl Passion prime plates have a mounting gap on this position which is used to mount their ‘Apollo’ help between the prime plate and base. This has the added impact of serving to to transfer any vibrational power from the prime plate, into the base and out by way of the ft. This requires a hole be drilled in the normal TD-150 sub-chassis, as this supporting pillar should move via the sub-chassis however nonetheless permit it to maneuver freely to realize the desired bounce.
VP’s answer is a excessive tech carbon fibre pillar (the Apollo). Mine was a bit of more simplified. I bolted a 70 mm M5 bolt tightly to the prime plate, and bolted this securely to the T construction. A hole was then drilled in the baseboard to accommodate this bolt, and a nut and washer used beneath to tug both the prime plate and T construction in the direction of the baseboard once put in.
<img data-attachment-id="1511" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-top-view-platter-removed/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557864792","copyright":"","focal_length":"3.99","iso":"100","shutter_speed":"zero.25","title":"","orientation":"1"" data-image-title="Aap12 Top View Platter Removed" data-image-description="
Aap12 Prime View Platter Eliminated
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Prime View Platter Eliminated” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1511″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3000831396″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
During setup I experienced quite a little bit of the dreaded LP12 prime plate rattle. That is quite a standard situation the place the prime plate will rattle towards the plinth when tapped at the corners, often near the motor or energy change. This often requires ‘dressing’ of the prime plate, which includes bending it into form to type an arch over the two central mounting blocks. The chassis bolts then pull the prime plate down flat, and in concept stop it rattling at the corners.
Extra lately Linn has fitted a bolt to the underside of their prime plate in the motor corner, which bolts by way of considered one of the triangular braces in the plinth and is tightened just enough to remove the rattle. This is an area where a nook has been reduce and a quick fix utilized to overcome a problem brought on by poor design. Which may help the motor corner, however what about rattling around the change or on the corners close to the arm board?
Attempt as I’d, I couldn’t ‘dress’ the prime plate to a passable degree. I subsequently determined to enhance the mounting system by drilling a pair of mounting holes on the left-side, by means of which M5 bolts handed into the triangular braces beneath. This cured the drawback immediately, and didn’t affect the aesthetics in a unfavorable approach. Most aftermarket LP12 prime plates have a much better technique of mounting than the unique. I query why the unique engineers thought-about that two bolts (and a pair of self-tapping screws) in the centre of a versatile metallic plate was enough, however it is a drawback that’s simply solved. I additionally ditched those self-tapping screws in favour of one other pair of bolts which cross straight by way of the mounting blocks and bolt tightly towards the T construction, adding additional power to the prime plate mounting.
<img data-attachment-id="1490" data-permalink="https://www.audioappraisal.com/thorens-td-150-rebuild-part-two-project-maple/aap12-both-arm-boards-oiled/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1555953162","copyright":"","focal_length":"three.99","iso":"50","shutter_speed":"0.066666666666667","title":"","orientation":"6"" data-image-title="Aap12 Both Arm Boards Oiled" data-image-description="
Aap12 Each Arm Boards Oiled
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Both Arm Boards Oiled” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1490″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1498779631″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The arm board was minimize from a bit of Cherry and drilled for a Rega arm. It is mounted to the sub-chassis utilizing M3 bolts somewhat than the traditional small self-tapping screws. I favour the rigidity of this strategy, though it’s claimed that as the self-tapping screws are a ‘lossy’ type of mounting, they assist forestall any ringing of the sub-chassis from impeding the performance of the arm. In concept the rubber suspension grommets, bearing dampening and indeed the arm board itself will go some solution to dampen the sub-chassis, and bolting the arm board to the sub-chassis turns into far much less of a compromise if it is a compromise in any respect. A TD-150 truly has 5 predrilled holes for arm board mounting – four alongside the rebate, one proper centre – of which three are generally used. I found that the mounts at both finish of the rebate and the two holes central of the board gave the most safe fit whereas sustaining a constant aesthetic.
<img data-attachment-id="1501" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-underside-view-with-all-metal-parts-in-place/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557568757","copyright":"","focal_length":"three.99","iso":"32","shutter_speed":"zero.033333333333333","title":"","orientation":"1"" data-image-title="Aap12 Underside View With All Metal Parts In Place" data-image-description="
Aap12 Underside View With All Metallic Elements In Place
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Underside View With All Metallic Elements In Place” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1501″ data-recalc-dims=”1″ data-pagespeed-url-hash=”4126144248″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The suspension springs are one other product from Vinyl Ardour. They’re Linn spec springs, but with an anti-harmonic coating utilized in aircraft engines to assist minimise vibration. This cures the 10kHz resonance peak in the springs, which should go some method to eradicating some of the typical LP12 tonal colour. The spring set, priced at £55, is provided with current specification rubber grommets and the mandatory M5 flanged bolts, nuts and washers.
The standard TD-150 motor was lubricated with Mobil DTE medium, which is an ISO VG68 turbine oil and is an ideal substitute for the unique Thorens oil. A couple of drops have been utilized at the prime and backside of the motor shaft and allowed to work their method in. The SRM/Tech Thrust Bearing was then put in. This can be a tiny machined half which is adhered to the underside of the motor using the provided superglue. As soon as in place, a 4 mm ball bearing is lubricated with Moly grease (additionally provided) and dropped into place and held by a grub screw.
<img data-attachment-id="1494" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-motor-unwired/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557568762","copyright":"","focal_length":"three.99","iso":"40","shutter_speed":"zero.041666666666667","title":"","orientation":"6"" data-image-title="Aap12 Close Up Of Motor Unwired" data-image-description="
Aap12 Close Up Of Motor Unwired
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?fit=1024%2C768&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Shut Up Of Motor Unwired” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1494″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3344037201″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
Sometimes the shafts of those motors experience on the bearing sleeve, fairly than on a correct bearing. Some years ago it was found that supporting the shaft with a thrust plate beneath would significantly lessen vibration and motor noise, resulting in a smoother-running motor. Tightening the grub screw achieves this. As soon as tightened such that the shaft raises barely, the reverse end of the motor shaft rides on the ball bearing and thus is correctly supported. The distinction in the free motion of the motor is sort of shocking, and the enchancment in performance is critical. This can be a very elegant and nicely engineered mod.
So too are SRM’s damping merchandise. Constructed from a thick rubber polymer, they match tightly around the given elements. The MVA (motor vibration absorber) was completely sized to suit snugly round the motor casing with clearance for the cable exit. The BDR (bearing dampening rings) are provided as a set of two. I installed one at either finish of the housing, lining them up approximately with the places of the two inside bushings. Finally the platter damping ring (PDR) matches tightly around the outer rim of the platter and dampens it to a shocking diploma. This permits the use of a felt mat instead of the normal rubber mat, without worry of a ringing platter imparting any character of its personal.
The motor was wired to Vinyl Ardour’s Wave power supply. This can be a neat PCB containing an analogous circuit to that provided as commonplace with a TD-150, together with part and spark suppression capacitors and a voltage dropping resistor. There isn’t any fancy circuitry here and it might definitely be argued that at £55 the Wave is sort of expensive for what it is. Nevertheless it does make for a very neat set up with screw terminal connections and adhesive mounting standoffs, and additionally it is security fused which a regular TD-150 circuit just isn’t.
<img data-attachment-id="1504" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-sub-platter-and-switch/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557864805","copyright":"","focal_length":"3.99","iso":"125","shutter_speed":"zero.25","title":"","orientation":"1"" data-image-title="Aap12 Close Up Of Sub Platter And Switch" data-image-description="
Aap12 Shut Up Of Sub Platter And Change
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Shut Up Of Sub Platter And Change” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1504″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1605412308″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
I’m trying to implement a more refined energy provide, which can hopefully be coming in the close to future. This upgrade may also incorporate electronic velocity switching, as that is presently achieved by manually shifting the belt across the pulley.
With the deck principally assembled I mounted up the arm. The arm in query is a Rega RB202, extensively modified by Johnnie at Audio Origami. What Johnnie doesn’t find out about tonearm constructing, if there’s anything, isn’t value figuring out. The person is a fountain of data which he is all the time completely happy to impart, and his work and a spotlight to detail are prime notch.
<img data-attachment-id="1503" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-arm/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?fit=3024%2C4032&ssl=1" data-orig-size="3024,4032" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557864477","copyright":"","focal_length":"3.99","iso":"160","shutter_speed":"zero.25","title":"","orientation":"1"" data-image-title="Aap12 Close Up Of Arm" data-image-description="
Aap12 Shut Up Of Arm
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?fit=225%2C300&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?fit=768%2C1024&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?resize=225%2C300&ssl=1″ alt=”Aap12 Shut Up Of Arm” width=”225″ peak=”300″ class=”aligncenter size-medium wp-image-1503″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3008038859″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
I opted for an RB202 with a Cardas 33AWG OFC inner rewire and an excellent OFC external cable. Once I asked Johnnie about the use of the well-liked Cardas incognito wire, he identified that given the number of connections made within the supporting electronics, a single connection adjoining the inner wire to the external is of no significance. And apart from, the inner cable is comprised of hair-thin stranded cable which isn’t solely greater in resistance than a thicker wire, but can also be significantly extra fragile, more prone to RF interference hum than a correctly shielded exterior lead, and the wire can act as a microphone, transmitting airborne suggestions into the arm. The SOFC external cable has an RF defend and non microphonic layer and is coated in a gentle, versatile silicon cowl which makes it notably good for use in a suspended turntable.
<img data-attachment-id="1507" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-right-side-cover-down/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit score":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557864456","copyright":"","focal_length":"three.99","iso":"125","shutter_speed":"0.25","title":"","orientation":"1"" data-image-title="Aap12 Right Side Cover Down" data-image-description="
Aap12 Proper Aspect Cover Down
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Proper Aspect Cowl Down” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1507″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1974239250″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
Also specified have been upgraded horizontal and vertical bearings. These precision bearings are hand chosen from a batch of 100 to fit the particular person bearing shafts and bearing housing. The modifications have been topped off with a new chrome steel rear weight and end stub, and a foam fill to assist dampen the 600Hz ringing in the arm tube.
The arm was bolted to the arm board using 30 mm M3 Allen bolts, which can facilitate the addition of VTA shims should they ever grow to be crucial. I personally consider that Linn’s use of a P clip has extra to do with utilizing the arm cable to stop lateral motion of the sub-chassis than it does to cease the cable interfering with the ‘bounce’ of the suspension. I subsequently drilled a 40 mm gap beneath the arm and dropped the cable straight by means of.
<img data-attachment-id="1512" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-top-view-with-s-of-s-record-on/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557864709","copyright":"","focal_length":"3.99","iso":"320","shutter_speed":"0.25","title":"","orientation":"1"" data-image-title="Aap12 Top View With S Of S Record On" data-image-description="
Aap12 Prime View With S Of S Report On
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?fit=1024%2C768&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Prime View With S Of S Report On” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1512″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3039958624″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
With the deck assembled I balanced the suspension. I discovered that when utilizing a thick but light-weight felt mat, the platter barely had adequate mass to compress the springs given the size of the bolts. A Linn platter is a kilogram heavier so this comes as no surprise. Fortuitously bonding a plate of chrome steel to the prime of the Thorens platter will deliver it to virtually precisely the similar mass as a Linn platter and is a mod I’ll make quickly. In the meantime it is nonetheless attainable to realize a wonderfully good bounce when the weight of a report is in place.
<img data-attachment-id="1502" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-angled-top-view-with-s-of-s-record-on/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557864721","copyright":"","focal_length":"3.99","iso":"160","shutter_speed":"0.25","title":"","orientation":"1"" data-image-title="Aap12 Angled Top View With S Of S Record On" data-image-description="
Aap12 Angled Prime View With S Of S Document On
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Angled Prime View With S Of S Document On” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1502″ data-recalc-dims=”1″ data-pagespeed-url-hash=”2306319227″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
This concludes Part Three. In Part 4 I’ll cowl some basic notes accrued over the build of each turntables and sum up with some listening impressions. It’s also highly probably that we’ll carry out future modifications to the AAP12 in future postings, links to which could be present in the Collection Overview.
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Building the AAP12, Thorens TD-150 Modification Part Three
Herein we continue the tale of two turntables as introduced in Part One. When you haven’t seen the collection introduction, you could wish to do so now. In Part Two we constructed a TD-150 in a Maple wood plinth utilizing principally inventory elements. And now, finally, it’s time to build our LP12 clone, hereafter the AAP12, and mod it to the max.
<img data-attachment-id="1519" data-permalink="https://www.audioappraisal.com/thorens-td-150-rebuild-modification-part-one/aap12-original-top-view-with-platter/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?fit=3024%2C4032&ssl=1" data-orig-size="3024,4032" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1550758051","copyright":"","focal_length":"three.99","iso":"100","shutter_speed":"zero.058823529411765","title":"","orientation":"1"" data-image-title="Aap12 Original Top View With Platter" data-image-description="
Aap12 Unique Prime View With Platter
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?fit=225%2C300&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?fit=768%2C1024&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?resize=225%2C300&ssl=1″ alt=”Aap12 Unique Prime View With Platter” width=”225″ peak=”300″ class=”aligncenter size-medium wp-image-1519″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3377362314″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
As earlier than, stripping the donor deck was the first port of name. This deck was in significantly higher situation with the unique wooden plinth. I’m not a fan of the plinth. I feel it’s unnecessarily bulky and I’m not eager on the dust cowl design. I also don’t look after the method the prime plate sits pleased with the prime plinth frame. We will definitely do better.
<img data-attachment-id="1513" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-original-close-up-of-top-plate/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1550757987","copyright":"","focal_length":"three.99","iso":"40","shutter_speed":"zero.04","title":"","orientation":"1"" data-image-title="Aap12 Original Close Up Of Top Plate" data-image-description="
Aap12 Unique Close Up Of Prime Plate
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Unique Shut Up Of Prime Plate” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1513″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3809853746″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
Throughout disassembly I was interested to notice the design of the bearing. As an alternative of a captive ball as on the majority of TD-150 MK II fashions, this bearing ends in a machined conical level. I mentioned this to mark of Vinyl Ardour, who informed me that this superior bearing was used in the unique MK I model. After a little bit of digging I discovered a number of other MK II house owners with the similar bearing, which makes me ponder whether Thorens briefly carried the design over, or used up some surplus element inventory during the initial run of the updated models.
Further analysis means that this design was actually adopted after the captive ball design, and was introduced for the TD-125 MK II and TD-160 to enable the bearing shaft and housing to be shared between fashions. Incidentally it’s in all probability no coincidence that Linn’s single-point LP12 bearing just isn’t dissimilar in design, albeit bigger.
<img data-attachment-id="1499" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-glued-together/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1555691823","copyright":"","focal_length":"three.99","iso":"40","shutter_speed":"zero.041666666666667","title":"","orientation":"6"" data-image-title="Aap12 Glued Together" data-image-description="
Aap12 Glued Together
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Glued Together” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1499″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3494875605″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
A new plinth was then assembled from 23 mm thick Cherry. As with the Maple plinth partially two, the corners are mitred and glued and the braces are glued in place, with a 10 mm rebate for the baseboard and the prime plate inset by 3 mm. The thickness of the board necessitated some rebated battens be machined to help the prime plate whereas making the plinth giant sufficient to carry a standard-sized hinged dust cover. This was a distinction of a Meer two millimetres, however I might attempt to use thicker wooden in future.
<img data-attachment-id="1496" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-cut-outs-and-holes-drilled-in-plinth/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1555953184","copyright":"","focal_length":"3.99","iso":"50","shutter_speed":"0.066666666666667","title":"","orientation":"1"" data-image-title="Aap12 Cut Outs And Holes Drilled In Plinth" data-image-description="
Aap12 Reduce Outs And Holes Drilled In Plinth
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Minimize Outs And Holes Drilled In Plinth” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1496″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1582759720″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
As earlier than, the outward-facing edges of the triangular braces have been machined with clearance slots for the arm, motor and energy change cables utilizing a gap noticed mounted in a pillar drill, which allows a half circle to be cleanly minimize without utilizing the centre information bit.
<img data-attachment-id="1489" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-base-on/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557671212","copyright":"","focal_length":"3.99","iso":"40","shutter_speed":"0.058823529411765","title":"","orientation":"1"" data-image-title="Aap12 Base On" data-image-description="
Aap12 Base On
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Base On” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1489″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1449033498″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The baseboard is similar to that of the Maple plinth, constructed from a laminated plywood shower panel at a fraction over 10 mm in thickness. 24 mm Recesses allowed the ft to knock in tightly, and 24 mm access holes have been drilled for the suspension bolts and chassis bolts.
<img data-attachment-id="1493" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-metal-support-t-bar/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557568766","copyright":"","focal_length":"3.99","iso":"40","shutter_speed":"0.033333333333333","title":"","orientation":"6"" data-image-title="Aap12 Close Up Of Metallic Help ‘t’ Bar" data-image-description="
Aap12 Close Up Of Metallic Help ‘t’ Bar
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?fit=1024%2C768&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Close Up Of Metallic Help ‘t’ Bar” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1493″ data-recalc-dims=”1″ data-pagespeed-url-hash=”249940617″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The LP12 has a cross member spanning the depth of the plinth between the two prime plate mounting blocks. That is used to carry the power provide and wiring, but I needed to take the design one step additional. A T-shaped construction was constructed from aluminium and bolted into place, spanning the depth of the plinth and persevering with throughout to its right-hand aspect.
A standard drawback with the LP12 prime plate is that it has a tendency to sag in the center at the right-hand aspect, closest to the arm board because of the weight of the hanging sub-chassis. The Vinyl Passion prime plates have a mounting gap on this position which is used to mount their ‘Apollo’ help between the prime plate and base. This has the added impact of serving to to transfer any vibrational power from the prime plate, into the base and out by way of the ft. This requires a hole be drilled in the normal TD-150 sub-chassis, as this supporting pillar should move via the sub-chassis however nonetheless permit it to maneuver freely to realize the desired bounce.
VP’s answer is a excessive tech carbon fibre pillar (the Apollo). Mine was a bit of more simplified. I bolted a 70 mm M5 bolt tightly to the prime plate, and bolted this securely to the T construction. A hole was then drilled in the baseboard to accommodate this bolt, and a nut and washer used beneath to tug both the prime plate and T construction in the direction of the baseboard once put in.
<img data-attachment-id="1511" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-top-view-platter-removed/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557864792","copyright":"","focal_length":"3.99","iso":"100","shutter_speed":"zero.25","title":"","orientation":"1"" data-image-title="Aap12 Top View Platter Removed" data-image-description="
Aap12 Prime View Platter Eliminated
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Prime View Platter Eliminated” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1511″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3000831396″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
During setup I experienced quite a little bit of the dreaded LP12 prime plate rattle. That is quite a standard situation the place the prime plate will rattle towards the plinth when tapped at the corners, often near the motor or energy change. This often requires ‘dressing’ of the prime plate, which includes bending it into form to type an arch over the two central mounting blocks. The chassis bolts then pull the prime plate down flat, and in concept stop it rattling at the corners.
Extra lately Linn has fitted a bolt to the underside of their prime plate in the motor corner, which bolts by way of considered one of the triangular braces in the plinth and is tightened just enough to remove the rattle. This is an area where a nook has been reduce and a quick fix utilized to overcome a problem brought on by poor design. Which may help the motor corner, however what about rattling around the change or on the corners close to the arm board?
Attempt as I’d, I couldn’t ‘dress’ the prime plate to a passable degree. I subsequently determined to enhance the mounting system by drilling a pair of mounting holes on the left-side, by means of which M5 bolts handed into the triangular braces beneath. This cured the drawback immediately, and didn’t affect the aesthetics in a unfavorable approach. Most aftermarket LP12 prime plates have a much better technique of mounting than the unique. I query why the unique engineers thought-about that two bolts (and a pair of self-tapping screws) in the centre of a versatile metallic plate was enough, however it is a drawback that’s simply solved. I additionally ditched those self-tapping screws in favour of one other pair of bolts which cross straight by way of the mounting blocks and bolt tightly towards the T construction, adding additional power to the prime plate mounting.
<img data-attachment-id="1490" data-permalink="https://www.audioappraisal.com/thorens-td-150-rebuild-part-two-project-maple/aap12-both-arm-boards-oiled/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1555953162","copyright":"","focal_length":"three.99","iso":"50","shutter_speed":"0.066666666666667","title":"","orientation":"6"" data-image-title="Aap12 Both Arm Boards Oiled" data-image-description="
Aap12 Each Arm Boards Oiled
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Both Arm Boards Oiled” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1490″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1498779631″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The arm board was minimize from a bit of Cherry and drilled for a Rega arm. It is mounted to the sub-chassis utilizing M3 bolts somewhat than the traditional small self-tapping screws. I favour the rigidity of this strategy, though it’s claimed that as the self-tapping screws are a ‘lossy’ type of mounting, they assist forestall any ringing of the sub-chassis from impeding the performance of the arm. In concept the rubber suspension grommets, bearing dampening and indeed the arm board itself will go some solution to dampen the sub-chassis, and bolting the arm board to the sub-chassis turns into far much less of a compromise if it is a compromise in any respect. A TD-150 truly has 5 predrilled holes for arm board mounting – four alongside the rebate, one proper centre – of which three are generally used. I found that the mounts at both finish of the rebate and the two holes central of the board gave the most safe fit whereas sustaining a constant aesthetic.
<img data-attachment-id="1501" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-underside-view-with-all-metal-parts-in-place/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557568757","copyright":"","focal_length":"three.99","iso":"32","shutter_speed":"zero.033333333333333","title":"","orientation":"1"" data-image-title="Aap12 Underside View With All Metal Parts In Place" data-image-description="
Aap12 Underside View With All Metallic Elements In Place
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Underside View With All Metallic Elements In Place” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1501″ data-recalc-dims=”1″ data-pagespeed-url-hash=”4126144248″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The suspension springs are one other product from Vinyl Ardour. They’re Linn spec springs, but with an anti-harmonic coating utilized in aircraft engines to assist minimise vibration. This cures the 10kHz resonance peak in the springs, which should go some method to eradicating some of the typical LP12 tonal colour. The spring set, priced at £55, is provided with current specification rubber grommets and the mandatory M5 flanged bolts, nuts and washers.
The standard TD-150 motor was lubricated with Mobil DTE medium, which is an ISO VG68 turbine oil and is an ideal substitute for the unique Thorens oil. A couple of drops have been utilized at the prime and backside of the motor shaft and allowed to work their method in. The SRM/Tech Thrust Bearing was then put in. This can be a tiny machined half which is adhered to the underside of the motor using the provided superglue. As soon as in place, a 4 mm ball bearing is lubricated with Moly grease (additionally provided) and dropped into place and held by a grub screw.
<img data-attachment-id="1494" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-motor-unwired/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557568762","copyright":"","focal_length":"three.99","iso":"40","shutter_speed":"zero.041666666666667","title":"","orientation":"6"" data-image-title="Aap12 Close Up Of Motor Unwired" data-image-description="
Aap12 Close Up Of Motor Unwired
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?fit=1024%2C768&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Shut Up Of Motor Unwired” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1494″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3344037201″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
Sometimes the shafts of those motors experience on the bearing sleeve, fairly than on a correct bearing. Some years ago it was found that supporting the shaft with a thrust plate beneath would significantly lessen vibration and motor noise, resulting in a smoother-running motor. Tightening the grub screw achieves this. As soon as tightened such that the shaft raises barely, the reverse end of the motor shaft rides on the ball bearing and thus is correctly supported. The distinction in the free motion of the motor is sort of shocking, and the enchancment in performance is critical. This can be a very elegant and nicely engineered mod.
So too are SRM’s damping merchandise. Constructed from a thick rubber polymer, they match tightly around the given elements. The MVA (motor vibration absorber) was completely sized to suit snugly round the motor casing with clearance for the cable exit. The BDR (bearing dampening rings) are provided as a set of two. I installed one at either finish of the housing, lining them up approximately with the places of the two inside bushings. Finally the platter damping ring (PDR) matches tightly around the outer rim of the platter and dampens it to a shocking diploma. This permits the use of a felt mat instead of the normal rubber mat, without worry of a ringing platter imparting any character of its personal.
The motor was wired to Vinyl Ardour’s Wave power supply. This can be a neat PCB containing an analogous circuit to that provided as commonplace with a TD-150, together with part and spark suppression capacitors and a voltage dropping resistor. There isn’t any fancy circuitry here and it might definitely be argued that at £55 the Wave is sort of expensive for what it is. Nevertheless it does make for a very neat set up with screw terminal connections and adhesive mounting standoffs, and additionally it is security fused which a regular TD-150 circuit just isn’t.
<img data-attachment-id="1504" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-sub-platter-and-switch/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557864805","copyright":"","focal_length":"3.99","iso":"125","shutter_speed":"zero.25","title":"","orientation":"1"" data-image-title="Aap12 Close Up Of Sub Platter And Switch" data-image-description="
Aap12 Shut Up Of Sub Platter And Change
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Shut Up Of Sub Platter And Change” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1504″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1605412308″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
I’m trying to implement a more refined energy provide, which can hopefully be coming in the close to future. This upgrade may also incorporate electronic velocity switching, as that is presently achieved by manually shifting the belt across the pulley.
With the deck principally assembled I mounted up the arm. The arm in query is a Rega RB202, extensively modified by Johnnie at Audio Origami. What Johnnie doesn’t find out about tonearm constructing, if there’s anything, isn’t value figuring out. The person is a fountain of data which he is all the time completely happy to impart, and his work and a spotlight to detail are prime notch.
<img data-attachment-id="1503" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-arm/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?fit=3024%2C4032&ssl=1" data-orig-size="3024,4032" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557864477","copyright":"","focal_length":"3.99","iso":"160","shutter_speed":"zero.25","title":"","orientation":"1"" data-image-title="Aap12 Close Up Of Arm" data-image-description="
Aap12 Shut Up Of Arm
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?fit=225%2C300&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?fit=768%2C1024&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?resize=225%2C300&ssl=1″ alt=”Aap12 Shut Up Of Arm” width=”225″ peak=”300″ class=”aligncenter size-medium wp-image-1503″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3008038859″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
I opted for an RB202 with a Cardas 33AWG OFC inner rewire and an excellent OFC external cable. Once I asked Johnnie about the use of the well-liked Cardas incognito wire, he identified that given the number of connections made within the supporting electronics, a single connection adjoining the inner wire to the external is of no significance. And apart from, the inner cable is comprised of hair-thin stranded cable which isn’t solely greater in resistance than a thicker wire, but can also be significantly extra fragile, more prone to RF interference hum than a correctly shielded exterior lead, and the wire can act as a microphone, transmitting airborne suggestions into the arm. The SOFC external cable has an RF defend and non microphonic layer and is coated in a gentle, versatile silicon cowl which makes it notably good for use in a suspended turntable.
<img data-attachment-id="1507" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-right-side-cover-down/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit score":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557864456","copyright":"","focal_length":"three.99","iso":"125","shutter_speed":"0.25","title":"","orientation":"1"" data-image-title="Aap12 Right Side Cover Down" data-image-description="
Aap12 Proper Aspect Cover Down
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Proper Aspect Cowl Down” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1507″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1974239250″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
Also specified have been upgraded horizontal and vertical bearings. These precision bearings are hand chosen from a batch of 100 to fit the particular person bearing shafts and bearing housing. The modifications have been topped off with a new chrome steel rear weight and end stub, and a foam fill to assist dampen the 600Hz ringing in the arm tube.
The arm was bolted to the arm board using 30 mm M3 Allen bolts, which can facilitate the addition of VTA shims should they ever grow to be crucial. I personally consider that Linn’s use of a P clip has extra to do with utilizing the arm cable to stop lateral motion of the sub-chassis than it does to cease the cable interfering with the ‘bounce’ of the suspension. I subsequently drilled a 40 mm gap beneath the arm and dropped the cable straight by means of.
<img data-attachment-id="1512" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-top-view-with-s-of-s-record-on/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557864709","copyright":"","focal_length":"3.99","iso":"320","shutter_speed":"0.25","title":"","orientation":"1"" data-image-title="Aap12 Top View With S Of S Record On" data-image-description="
Aap12 Prime View With S Of S Report On
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?fit=1024%2C768&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Prime View With S Of S Report On” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1512″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3039958624″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
With the deck assembled I balanced the suspension. I discovered that when utilizing a thick but light-weight felt mat, the platter barely had adequate mass to compress the springs given the size of the bolts. A Linn platter is a kilogram heavier so this comes as no surprise. Fortuitously bonding a plate of chrome steel to the prime of the Thorens platter will deliver it to virtually precisely the similar mass as a Linn platter and is a mod I’ll make quickly. In the meantime it is nonetheless attainable to realize a wonderfully good bounce when the weight of a report is in place.
<img data-attachment-id="1502" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-angled-top-view-with-s-of-s-record-on/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557864721","copyright":"","focal_length":"3.99","iso":"160","shutter_speed":"0.25","title":"","orientation":"1"" data-image-title="Aap12 Angled Top View With S Of S Record On" data-image-description="
Aap12 Angled Prime View With S Of S Document On
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Angled Prime View With S Of S Document On” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1502″ data-recalc-dims=”1″ data-pagespeed-url-hash=”2306319227″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
This concludes Part Three. In Part 4 I’ll cowl some basic notes accrued over the build of each turntables and sum up with some listening impressions. It’s also highly probably that we’ll carry out future modifications to the AAP12 in future postings, links to which could be present in the Collection Overview.
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Building the AAP12, Thorens TD-150 Modification Part Three
Herein we continue the tale of two turntables as introduced in Part One. When you haven’t seen the collection introduction, you could wish to do so now. In Part Two we constructed a TD-150 in a Maple wood plinth utilizing principally inventory elements. And now, finally, it’s time to build our LP12 clone, hereafter the AAP12, and mod it to the max.
<img data-attachment-id="1519" data-permalink="https://www.audioappraisal.com/thorens-td-150-rebuild-modification-part-one/aap12-original-top-view-with-platter/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?fit=3024%2C4032&ssl=1" data-orig-size="3024,4032" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1550758051","copyright":"","focal_length":"three.99","iso":"100","shutter_speed":"zero.058823529411765","title":"","orientation":"1"" data-image-title="Aap12 Original Top View With Platter" data-image-description="
Aap12 Unique Prime View With Platter
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?fit=225%2C300&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?fit=768%2C1024&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?resize=225%2C300&ssl=1″ alt=”Aap12 Unique Prime View With Platter” width=”225″ peak=”300″ class=”aligncenter size-medium wp-image-1519″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3377362314″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
As earlier than, stripping the donor deck was the first port of name. This deck was in significantly higher situation with the unique wooden plinth. I’m not a fan of the plinth. I feel it’s unnecessarily bulky and I’m not eager on the dust cowl design. I also don’t look after the method the prime plate sits pleased with the prime plinth frame. We will definitely do better.
<img data-attachment-id="1513" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-original-close-up-of-top-plate/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1550757987","copyright":"","focal_length":"three.99","iso":"40","shutter_speed":"zero.04","title":"","orientation":"1"" data-image-title="Aap12 Original Close Up Of Top Plate" data-image-description="
Aap12 Unique Close Up Of Prime Plate
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Unique Shut Up Of Prime Plate” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1513″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3809853746″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
Throughout disassembly I was interested to notice the design of the bearing. As an alternative of a captive ball as on the majority of TD-150 MK II fashions, this bearing ends in a machined conical level. I mentioned this to mark of Vinyl Ardour, who informed me that this superior bearing was used in the unique MK I model. After a little bit of digging I discovered a number of other MK II house owners with the similar bearing, which makes me ponder whether Thorens briefly carried the design over, or used up some surplus element inventory during the initial run of the updated models.
Further analysis means that this design was actually adopted after the captive ball design, and was introduced for the TD-125 MK II and TD-160 to enable the bearing shaft and housing to be shared between fashions. Incidentally it’s in all probability no coincidence that Linn’s single-point LP12 bearing just isn’t dissimilar in design, albeit bigger.
<img data-attachment-id="1499" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-glued-together/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1555691823","copyright":"","focal_length":"three.99","iso":"40","shutter_speed":"zero.041666666666667","title":"","orientation":"6"" data-image-title="Aap12 Glued Together" data-image-description="
Aap12 Glued Together
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Glued Together” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1499″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3494875605″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
A new plinth was then assembled from 23 mm thick Cherry. As with the Maple plinth partially two, the corners are mitred and glued and the braces are glued in place, with a 10 mm rebate for the baseboard and the prime plate inset by 3 mm. The thickness of the board necessitated some rebated battens be machined to help the prime plate whereas making the plinth giant sufficient to carry a standard-sized hinged dust cover. This was a distinction of a Meer two millimetres, however I might attempt to use thicker wooden in future.
<img data-attachment-id="1496" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-cut-outs-and-holes-drilled-in-plinth/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1555953184","copyright":"","focal_length":"3.99","iso":"50","shutter_speed":"0.066666666666667","title":"","orientation":"1"" data-image-title="Aap12 Cut Outs And Holes Drilled In Plinth" data-image-description="
Aap12 Reduce Outs And Holes Drilled In Plinth
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Minimize Outs And Holes Drilled In Plinth” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1496″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1582759720″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
As earlier than, the outward-facing edges of the triangular braces have been machined with clearance slots for the arm, motor and energy change cables utilizing a gap noticed mounted in a pillar drill, which allows a half circle to be cleanly minimize without utilizing the centre information bit.
<img data-attachment-id="1489" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-base-on/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557671212","copyright":"","focal_length":"3.99","iso":"40","shutter_speed":"0.058823529411765","title":"","orientation":"1"" data-image-title="Aap12 Base On" data-image-description="
Aap12 Base On
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Base On” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1489″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1449033498″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The baseboard is similar to that of the Maple plinth, constructed from a laminated plywood shower panel at a fraction over 10 mm in thickness. 24 mm Recesses allowed the ft to knock in tightly, and 24 mm access holes have been drilled for the suspension bolts and chassis bolts.
<img data-attachment-id="1493" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-metal-support-t-bar/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557568766","copyright":"","focal_length":"3.99","iso":"40","shutter_speed":"0.033333333333333","title":"","orientation":"6"" data-image-title="Aap12 Close Up Of Metallic Help ‘t’ Bar" data-image-description="
Aap12 Close Up Of Metallic Help ‘t’ Bar
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?fit=1024%2C768&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Close Up Of Metallic Help ‘t’ Bar” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1493″ data-recalc-dims=”1″ data-pagespeed-url-hash=”249940617″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The LP12 has a cross member spanning the depth of the plinth between the two prime plate mounting blocks. That is used to carry the power provide and wiring, but I needed to take the design one step additional. A T-shaped construction was constructed from aluminium and bolted into place, spanning the depth of the plinth and persevering with throughout to its right-hand aspect.
A standard drawback with the LP12 prime plate is that it has a tendency to sag in the center at the right-hand aspect, closest to the arm board because of the weight of the hanging sub-chassis. The Vinyl Passion prime plates have a mounting gap on this position which is used to mount their ‘Apollo’ help between the prime plate and base. This has the added impact of serving to to transfer any vibrational power from the prime plate, into the base and out by way of the ft. This requires a hole be drilled in the normal TD-150 sub-chassis, as this supporting pillar should move via the sub-chassis however nonetheless permit it to maneuver freely to realize the desired bounce.
VP’s answer is a excessive tech carbon fibre pillar (the Apollo). Mine was a bit of more simplified. I bolted a 70 mm M5 bolt tightly to the prime plate, and bolted this securely to the T construction. A hole was then drilled in the baseboard to accommodate this bolt, and a nut and washer used beneath to tug both the prime plate and T construction in the direction of the baseboard once put in.
<img data-attachment-id="1511" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-top-view-platter-removed/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557864792","copyright":"","focal_length":"3.99","iso":"100","shutter_speed":"zero.25","title":"","orientation":"1"" data-image-title="Aap12 Top View Platter Removed" data-image-description="
Aap12 Prime View Platter Eliminated
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Prime View Platter Eliminated” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1511″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3000831396″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
During setup I experienced quite a little bit of the dreaded LP12 prime plate rattle. That is quite a standard situation the place the prime plate will rattle towards the plinth when tapped at the corners, often near the motor or energy change. This often requires ‘dressing’ of the prime plate, which includes bending it into form to type an arch over the two central mounting blocks. The chassis bolts then pull the prime plate down flat, and in concept stop it rattling at the corners.
Extra lately Linn has fitted a bolt to the underside of their prime plate in the motor corner, which bolts by way of considered one of the triangular braces in the plinth and is tightened just enough to remove the rattle. This is an area where a nook has been reduce and a quick fix utilized to overcome a problem brought on by poor design. Which may help the motor corner, however what about rattling around the change or on the corners close to the arm board?
Attempt as I’d, I couldn’t ‘dress’ the prime plate to a passable degree. I subsequently determined to enhance the mounting system by drilling a pair of mounting holes on the left-side, by means of which M5 bolts handed into the triangular braces beneath. This cured the drawback immediately, and didn’t affect the aesthetics in a unfavorable approach. Most aftermarket LP12 prime plates have a much better technique of mounting than the unique. I query why the unique engineers thought-about that two bolts (and a pair of self-tapping screws) in the centre of a versatile metallic plate was enough, however it is a drawback that’s simply solved. I additionally ditched those self-tapping screws in favour of one other pair of bolts which cross straight by way of the mounting blocks and bolt tightly towards the T construction, adding additional power to the prime plate mounting.
<img data-attachment-id="1490" data-permalink="https://www.audioappraisal.com/thorens-td-150-rebuild-part-two-project-maple/aap12-both-arm-boards-oiled/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1555953162","copyright":"","focal_length":"three.99","iso":"50","shutter_speed":"0.066666666666667","title":"","orientation":"6"" data-image-title="Aap12 Both Arm Boards Oiled" data-image-description="
Aap12 Each Arm Boards Oiled
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Both Arm Boards Oiled” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1490″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1498779631″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The arm board was minimize from a bit of Cherry and drilled for a Rega arm. It is mounted to the sub-chassis utilizing M3 bolts somewhat than the traditional small self-tapping screws. I favour the rigidity of this strategy, though it’s claimed that as the self-tapping screws are a ‘lossy’ type of mounting, they assist forestall any ringing of the sub-chassis from impeding the performance of the arm. In concept the rubber suspension grommets, bearing dampening and indeed the arm board itself will go some solution to dampen the sub-chassis, and bolting the arm board to the sub-chassis turns into far much less of a compromise if it is a compromise in any respect. A TD-150 truly has 5 predrilled holes for arm board mounting – four alongside the rebate, one proper centre – of which three are generally used. I found that the mounts at both finish of the rebate and the two holes central of the board gave the most safe fit whereas sustaining a constant aesthetic.
<img data-attachment-id="1501" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-underside-view-with-all-metal-parts-in-place/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557568757","copyright":"","focal_length":"three.99","iso":"32","shutter_speed":"zero.033333333333333","title":"","orientation":"1"" data-image-title="Aap12 Underside View With All Metal Parts In Place" data-image-description="
Aap12 Underside View With All Metallic Elements In Place
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Underside View With All Metallic Elements In Place” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1501″ data-recalc-dims=”1″ data-pagespeed-url-hash=”4126144248″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The suspension springs are one other product from Vinyl Ardour. They’re Linn spec springs, but with an anti-harmonic coating utilized in aircraft engines to assist minimise vibration. This cures the 10kHz resonance peak in the springs, which should go some method to eradicating some of the typical LP12 tonal colour. The spring set, priced at £55, is provided with current specification rubber grommets and the mandatory M5 flanged bolts, nuts and washers.
The standard TD-150 motor was lubricated with Mobil DTE medium, which is an ISO VG68 turbine oil and is an ideal substitute for the unique Thorens oil. A couple of drops have been utilized at the prime and backside of the motor shaft and allowed to work their method in. The SRM/Tech Thrust Bearing was then put in. This can be a tiny machined half which is adhered to the underside of the motor using the provided superglue. As soon as in place, a 4 mm ball bearing is lubricated with Moly grease (additionally provided) and dropped into place and held by a grub screw.
<img data-attachment-id="1494" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-motor-unwired/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557568762","copyright":"","focal_length":"three.99","iso":"40","shutter_speed":"zero.041666666666667","title":"","orientation":"6"" data-image-title="Aap12 Close Up Of Motor Unwired" data-image-description="
Aap12 Close Up Of Motor Unwired
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?fit=1024%2C768&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Shut Up Of Motor Unwired” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1494″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3344037201″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
Sometimes the shafts of those motors experience on the bearing sleeve, fairly than on a correct bearing. Some years ago it was found that supporting the shaft with a thrust plate beneath would significantly lessen vibration and motor noise, resulting in a smoother-running motor. Tightening the grub screw achieves this. As soon as tightened such that the shaft raises barely, the reverse end of the motor shaft rides on the ball bearing and thus is correctly supported. The distinction in the free motion of the motor is sort of shocking, and the enchancment in performance is critical. This can be a very elegant and nicely engineered mod.
So too are SRM’s damping merchandise. Constructed from a thick rubber polymer, they match tightly around the given elements. The MVA (motor vibration absorber) was completely sized to suit snugly round the motor casing with clearance for the cable exit. The BDR (bearing dampening rings) are provided as a set of two. I installed one at either finish of the housing, lining them up approximately with the places of the two inside bushings. Finally the platter damping ring (PDR) matches tightly around the outer rim of the platter and dampens it to a shocking diploma. This permits the use of a felt mat instead of the normal rubber mat, without worry of a ringing platter imparting any character of its personal.
The motor was wired to Vinyl Ardour’s Wave power supply. This can be a neat PCB containing an analogous circuit to that provided as commonplace with a TD-150, together with part and spark suppression capacitors and a voltage dropping resistor. There isn’t any fancy circuitry here and it might definitely be argued that at £55 the Wave is sort of expensive for what it is. Nevertheless it does make for a very neat set up with screw terminal connections and adhesive mounting standoffs, and additionally it is security fused which a regular TD-150 circuit just isn’t.
<img data-attachment-id="1504" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-sub-platter-and-switch/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557864805","copyright":"","focal_length":"3.99","iso":"125","shutter_speed":"zero.25","title":"","orientation":"1"" data-image-title="Aap12 Close Up Of Sub Platter And Switch" data-image-description="
Aap12 Shut Up Of Sub Platter And Change
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Shut Up Of Sub Platter And Change” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1504″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1605412308″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
I’m trying to implement a more refined energy provide, which can hopefully be coming in the close to future. This upgrade may also incorporate electronic velocity switching, as that is presently achieved by manually shifting the belt across the pulley.
With the deck principally assembled I mounted up the arm. The arm in query is a Rega RB202, extensively modified by Johnnie at Audio Origami. What Johnnie doesn’t find out about tonearm constructing, if there’s anything, isn’t value figuring out. The person is a fountain of data which he is all the time completely happy to impart, and his work and a spotlight to detail are prime notch.
<img data-attachment-id="1503" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-arm/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?fit=3024%2C4032&ssl=1" data-orig-size="3024,4032" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557864477","copyright":"","focal_length":"3.99","iso":"160","shutter_speed":"zero.25","title":"","orientation":"1"" data-image-title="Aap12 Close Up Of Arm" data-image-description="
Aap12 Shut Up Of Arm
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?fit=225%2C300&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?fit=768%2C1024&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?resize=225%2C300&ssl=1″ alt=”Aap12 Shut Up Of Arm” width=”225″ peak=”300″ class=”aligncenter size-medium wp-image-1503″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3008038859″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
I opted for an RB202 with a Cardas 33AWG OFC inner rewire and an excellent OFC external cable. Once I asked Johnnie about the use of the well-liked Cardas incognito wire, he identified that given the number of connections made within the supporting electronics, a single connection adjoining the inner wire to the external is of no significance. And apart from, the inner cable is comprised of hair-thin stranded cable which isn’t solely greater in resistance than a thicker wire, but can also be significantly extra fragile, more prone to RF interference hum than a correctly shielded exterior lead, and the wire can act as a microphone, transmitting airborne suggestions into the arm. The SOFC external cable has an RF defend and non microphonic layer and is coated in a gentle, versatile silicon cowl which makes it notably good for use in a suspended turntable.
<img data-attachment-id="1507" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-right-side-cover-down/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit score":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557864456","copyright":"","focal_length":"three.99","iso":"125","shutter_speed":"0.25","title":"","orientation":"1"" data-image-title="Aap12 Right Side Cover Down" data-image-description="
Aap12 Proper Aspect Cover Down
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Proper Aspect Cowl Down” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1507″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1974239250″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
Also specified have been upgraded horizontal and vertical bearings. These precision bearings are hand chosen from a batch of 100 to fit the particular person bearing shafts and bearing housing. The modifications have been topped off with a new chrome steel rear weight and end stub, and a foam fill to assist dampen the 600Hz ringing in the arm tube.
The arm was bolted to the arm board using 30 mm M3 Allen bolts, which can facilitate the addition of VTA shims should they ever grow to be crucial. I personally consider that Linn’s use of a P clip has extra to do with utilizing the arm cable to stop lateral motion of the sub-chassis than it does to cease the cable interfering with the ‘bounce’ of the suspension. I subsequently drilled a 40 mm gap beneath the arm and dropped the cable straight by means of.
<img data-attachment-id="1512" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-top-view-with-s-of-s-record-on/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557864709","copyright":"","focal_length":"3.99","iso":"320","shutter_speed":"0.25","title":"","orientation":"1"" data-image-title="Aap12 Top View With S Of S Record On" data-image-description="
Aap12 Prime View With S Of S Report On
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?fit=1024%2C768&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Prime View With S Of S Report On” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1512″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3039958624″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
With the deck assembled I balanced the suspension. I discovered that when utilizing a thick but light-weight felt mat, the platter barely had adequate mass to compress the springs given the size of the bolts. A Linn platter is a kilogram heavier so this comes as no surprise. Fortuitously bonding a plate of chrome steel to the prime of the Thorens platter will deliver it to virtually precisely the similar mass as a Linn platter and is a mod I’ll make quickly. In the meantime it is nonetheless attainable to realize a wonderfully good bounce when the weight of a report is in place.
<img data-attachment-id="1502" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-angled-top-view-with-s-of-s-record-on/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557864721","copyright":"","focal_length":"3.99","iso":"160","shutter_speed":"0.25","title":"","orientation":"1"" data-image-title="Aap12 Angled Top View With S Of S Record On" data-image-description="
Aap12 Angled Prime View With S Of S Document On
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Angled Prime View With S Of S Document On” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1502″ data-recalc-dims=”1″ data-pagespeed-url-hash=”2306319227″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
This concludes Part Three. In Part 4 I’ll cowl some basic notes accrued over the build of each turntables and sum up with some listening impressions. It’s also highly probably that we’ll carry out future modifications to the AAP12 in future postings, links to which could be present in the Collection Overview.
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Building the AAP12, Thorens TD-150 Modification Part Three
Herein we continue the tale of two turntables as introduced in Part One. When you haven’t seen the collection introduction, you could wish to do so now. In Part Two we constructed a TD-150 in a Maple wood plinth utilizing principally inventory elements. And now, finally, it’s time to build our LP12 clone, hereafter the AAP12, and mod it to the max.
<img data-attachment-id="1519" data-permalink="https://www.audioappraisal.com/thorens-td-150-rebuild-modification-part-one/aap12-original-top-view-with-platter/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?fit=3024%2C4032&ssl=1" data-orig-size="3024,4032" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1550758051","copyright":"","focal_length":"three.99","iso":"100","shutter_speed":"zero.058823529411765","title":"","orientation":"1"" data-image-title="Aap12 Original Top View With Platter" data-image-description="
Aap12 Unique Prime View With Platter
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?fit=225%2C300&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?fit=768%2C1024&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Top-view-with-platter-.jpg?resize=225%2C300&ssl=1″ alt=”Aap12 Unique Prime View With Platter” width=”225″ peak=”300″ class=”aligncenter size-medium wp-image-1519″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3377362314″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
As earlier than, stripping the donor deck was the first port of name. This deck was in significantly higher situation with the unique wooden plinth. I’m not a fan of the plinth. I feel it’s unnecessarily bulky and I’m not eager on the dust cowl design. I also don’t look after the method the prime plate sits pleased with the prime plinth frame. We will definitely do better.
<img data-attachment-id="1513" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-original-close-up-of-top-plate/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1550757987","copyright":"","focal_length":"three.99","iso":"40","shutter_speed":"zero.04","title":"","orientation":"1"" data-image-title="Aap12 Original Close Up Of Top Plate" data-image-description="
Aap12 Unique Close Up Of Prime Plate
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Original-Close-up-of-top-plate-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Unique Shut Up Of Prime Plate” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1513″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3809853746″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
Throughout disassembly I was interested to notice the design of the bearing. As an alternative of a captive ball as on the majority of TD-150 MK II fashions, this bearing ends in a machined conical level. I mentioned this to mark of Vinyl Ardour, who informed me that this superior bearing was used in the unique MK I model. After a little bit of digging I discovered a number of other MK II house owners with the similar bearing, which makes me ponder whether Thorens briefly carried the design over, or used up some surplus element inventory during the initial run of the updated models.
Further analysis means that this design was actually adopted after the captive ball design, and was introduced for the TD-125 MK II and TD-160 to enable the bearing shaft and housing to be shared between fashions. Incidentally it’s in all probability no coincidence that Linn’s single-point LP12 bearing just isn’t dissimilar in design, albeit bigger.
<img data-attachment-id="1499" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-glued-together/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1555691823","copyright":"","focal_length":"three.99","iso":"40","shutter_speed":"zero.041666666666667","title":"","orientation":"6"" data-image-title="Aap12 Glued Together" data-image-description="
Aap12 Glued Together
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Glued-together-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Glued Together” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1499″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3494875605″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
A new plinth was then assembled from 23 mm thick Cherry. As with the Maple plinth partially two, the corners are mitred and glued and the braces are glued in place, with a 10 mm rebate for the baseboard and the prime plate inset by 3 mm. The thickness of the board necessitated some rebated battens be machined to help the prime plate whereas making the plinth giant sufficient to carry a standard-sized hinged dust cover. This was a distinction of a Meer two millimetres, however I might attempt to use thicker wooden in future.
<img data-attachment-id="1496" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-cut-outs-and-holes-drilled-in-plinth/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1555953184","copyright":"","focal_length":"3.99","iso":"50","shutter_speed":"0.066666666666667","title":"","orientation":"1"" data-image-title="Aap12 Cut Outs And Holes Drilled In Plinth" data-image-description="
Aap12 Reduce Outs And Holes Drilled In Plinth
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Cut-outs-and-holes-drilled-in-plinth-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Minimize Outs And Holes Drilled In Plinth” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1496″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1582759720″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
As earlier than, the outward-facing edges of the triangular braces have been machined with clearance slots for the arm, motor and energy change cables utilizing a gap noticed mounted in a pillar drill, which allows a half circle to be cleanly minimize without utilizing the centre information bit.
<img data-attachment-id="1489" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-base-on/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557671212","copyright":"","focal_length":"3.99","iso":"40","shutter_speed":"0.058823529411765","title":"","orientation":"1"" data-image-title="Aap12 Base On" data-image-description="
Aap12 Base On
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-base-on-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Base On” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1489″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1449033498″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The baseboard is similar to that of the Maple plinth, constructed from a laminated plywood shower panel at a fraction over 10 mm in thickness. 24 mm Recesses allowed the ft to knock in tightly, and 24 mm access holes have been drilled for the suspension bolts and chassis bolts.
<img data-attachment-id="1493" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-metal-support-t-bar/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557568766","copyright":"","focal_length":"3.99","iso":"40","shutter_speed":"0.033333333333333","title":"","orientation":"6"" data-image-title="Aap12 Close Up Of Metallic Help ‘t’ Bar" data-image-description="
Aap12 Close Up Of Metallic Help ‘t’ Bar
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?fit=1024%2C768&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-close-up-of-metal-support-t-bar-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Close Up Of Metallic Help ‘t’ Bar” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1493″ data-recalc-dims=”1″ data-pagespeed-url-hash=”249940617″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The LP12 has a cross member spanning the depth of the plinth between the two prime plate mounting blocks. That is used to carry the power provide and wiring, but I needed to take the design one step additional. A T-shaped construction was constructed from aluminium and bolted into place, spanning the depth of the plinth and persevering with throughout to its right-hand aspect.
A standard drawback with the LP12 prime plate is that it has a tendency to sag in the center at the right-hand aspect, closest to the arm board because of the weight of the hanging sub-chassis. The Vinyl Passion prime plates have a mounting gap on this position which is used to mount their ‘Apollo’ help between the prime plate and base. This has the added impact of serving to to transfer any vibrational power from the prime plate, into the base and out by way of the ft. This requires a hole be drilled in the normal TD-150 sub-chassis, as this supporting pillar should move via the sub-chassis however nonetheless permit it to maneuver freely to realize the desired bounce.
VP’s answer is a excessive tech carbon fibre pillar (the Apollo). Mine was a bit of more simplified. I bolted a 70 mm M5 bolt tightly to the prime plate, and bolted this securely to the T construction. A hole was then drilled in the baseboard to accommodate this bolt, and a nut and washer used beneath to tug both the prime plate and T construction in the direction of the baseboard once put in.
<img data-attachment-id="1511" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-top-view-platter-removed/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557864792","copyright":"","focal_length":"3.99","iso":"100","shutter_speed":"zero.25","title":"","orientation":"1"" data-image-title="Aap12 Top View Platter Removed" data-image-description="
Aap12 Prime View Platter Eliminated
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Top-view-platter-removed-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Prime View Platter Eliminated” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1511″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3000831396″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
During setup I experienced quite a little bit of the dreaded LP12 prime plate rattle. That is quite a standard situation the place the prime plate will rattle towards the plinth when tapped at the corners, often near the motor or energy change. This often requires ‘dressing’ of the prime plate, which includes bending it into form to type an arch over the two central mounting blocks. The chassis bolts then pull the prime plate down flat, and in concept stop it rattling at the corners.
Extra lately Linn has fitted a bolt to the underside of their prime plate in the motor corner, which bolts by way of considered one of the triangular braces in the plinth and is tightened just enough to remove the rattle. This is an area where a nook has been reduce and a quick fix utilized to overcome a problem brought on by poor design. Which may help the motor corner, however what about rattling around the change or on the corners close to the arm board?
Attempt as I’d, I couldn’t ‘dress’ the prime plate to a passable degree. I subsequently determined to enhance the mounting system by drilling a pair of mounting holes on the left-side, by means of which M5 bolts handed into the triangular braces beneath. This cured the drawback immediately, and didn’t affect the aesthetics in a unfavorable approach. Most aftermarket LP12 prime plates have a much better technique of mounting than the unique. I query why the unique engineers thought-about that two bolts (and a pair of self-tapping screws) in the centre of a versatile metallic plate was enough, however it is a drawback that’s simply solved. I additionally ditched those self-tapping screws in favour of one other pair of bolts which cross straight by way of the mounting blocks and bolt tightly towards the T construction, adding additional power to the prime plate mounting.
<img data-attachment-id="1490" data-permalink="https://www.audioappraisal.com/thorens-td-150-rebuild-part-two-project-maple/aap12-both-arm-boards-oiled/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1555953162","copyright":"","focal_length":"three.99","iso":"50","shutter_speed":"0.066666666666667","title":"","orientation":"6"" data-image-title="Aap12 Both Arm Boards Oiled" data-image-description="
Aap12 Each Arm Boards Oiled
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Both-arm-boards-oiled-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Both Arm Boards Oiled” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1490″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1498779631″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The arm board was minimize from a bit of Cherry and drilled for a Rega arm. It is mounted to the sub-chassis utilizing M3 bolts somewhat than the traditional small self-tapping screws. I favour the rigidity of this strategy, though it’s claimed that as the self-tapping screws are a ‘lossy’ type of mounting, they assist forestall any ringing of the sub-chassis from impeding the performance of the arm. In concept the rubber suspension grommets, bearing dampening and indeed the arm board itself will go some solution to dampen the sub-chassis, and bolting the arm board to the sub-chassis turns into far much less of a compromise if it is a compromise in any respect. A TD-150 truly has 5 predrilled holes for arm board mounting – four alongside the rebate, one proper centre – of which three are generally used. I found that the mounts at both finish of the rebate and the two holes central of the board gave the most safe fit whereas sustaining a constant aesthetic.
<img data-attachment-id="1501" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-underside-view-with-all-metal-parts-in-place/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557568757","copyright":"","focal_length":"three.99","iso":"32","shutter_speed":"zero.033333333333333","title":"","orientation":"1"" data-image-title="Aap12 Underside View With All Metal Parts In Place" data-image-description="
Aap12 Underside View With All Metallic Elements In Place
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Underside-view-with-all-metal-parts-in-place-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Underside View With All Metallic Elements In Place” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1501″ data-recalc-dims=”1″ data-pagespeed-url-hash=”4126144248″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
The suspension springs are one other product from Vinyl Ardour. They’re Linn spec springs, but with an anti-harmonic coating utilized in aircraft engines to assist minimise vibration. This cures the 10kHz resonance peak in the springs, which should go some method to eradicating some of the typical LP12 tonal colour. The spring set, priced at £55, is provided with current specification rubber grommets and the mandatory M5 flanged bolts, nuts and washers.
The standard TD-150 motor was lubricated with Mobil DTE medium, which is an ISO VG68 turbine oil and is an ideal substitute for the unique Thorens oil. A couple of drops have been utilized at the prime and backside of the motor shaft and allowed to work their method in. The SRM/Tech Thrust Bearing was then put in. This can be a tiny machined half which is adhered to the underside of the motor using the provided superglue. As soon as in place, a 4 mm ball bearing is lubricated with Moly grease (additionally provided) and dropped into place and held by a grub screw.
<img data-attachment-id="1494" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-motor-unwired/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557568762","copyright":"","focal_length":"three.99","iso":"40","shutter_speed":"zero.041666666666667","title":"","orientation":"6"" data-image-title="Aap12 Close Up Of Motor Unwired" data-image-description="
Aap12 Close Up Of Motor Unwired
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?fit=1024%2C768&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-motor-unwired-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Shut Up Of Motor Unwired” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1494″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3344037201″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
Sometimes the shafts of those motors experience on the bearing sleeve, fairly than on a correct bearing. Some years ago it was found that supporting the shaft with a thrust plate beneath would significantly lessen vibration and motor noise, resulting in a smoother-running motor. Tightening the grub screw achieves this. As soon as tightened such that the shaft raises barely, the reverse end of the motor shaft rides on the ball bearing and thus is correctly supported. The distinction in the free motion of the motor is sort of shocking, and the enchancment in performance is critical. This can be a very elegant and nicely engineered mod.
So too are SRM’s damping merchandise. Constructed from a thick rubber polymer, they match tightly around the given elements. The MVA (motor vibration absorber) was completely sized to suit snugly round the motor casing with clearance for the cable exit. The BDR (bearing dampening rings) are provided as a set of two. I installed one at either finish of the housing, lining them up approximately with the places of the two inside bushings. Finally the platter damping ring (PDR) matches tightly around the outer rim of the platter and dampens it to a shocking diploma. This permits the use of a felt mat instead of the normal rubber mat, without worry of a ringing platter imparting any character of its personal.
The motor was wired to Vinyl Ardour’s Wave power supply. This can be a neat PCB containing an analogous circuit to that provided as commonplace with a TD-150, together with part and spark suppression capacitors and a voltage dropping resistor. There isn’t any fancy circuitry here and it might definitely be argued that at £55 the Wave is sort of expensive for what it is. Nevertheless it does make for a very neat set up with screw terminal connections and adhesive mounting standoffs, and additionally it is security fused which a regular TD-150 circuit just isn’t.
<img data-attachment-id="1504" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-sub-platter-and-switch/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.eight","credit score":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557864805","copyright":"","focal_length":"3.99","iso":"125","shutter_speed":"zero.25","title":"","orientation":"1"" data-image-title="Aap12 Close Up Of Sub Platter And Switch" data-image-description="
Aap12 Shut Up Of Sub Platter And Change
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-sub-platter-and-switch-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Shut Up Of Sub Platter And Change” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1504″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1605412308″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
I’m trying to implement a more refined energy provide, which can hopefully be coming in the close to future. This upgrade may also incorporate electronic velocity switching, as that is presently achieved by manually shifting the belt across the pulley.
With the deck principally assembled I mounted up the arm. The arm in query is a Rega RB202, extensively modified by Johnnie at Audio Origami. What Johnnie doesn’t find out about tonearm constructing, if there’s anything, isn’t value figuring out. The person is a fountain of data which he is all the time completely happy to impart, and his work and a spotlight to detail are prime notch.
<img data-attachment-id="1503" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-close-up-of-arm/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?fit=3024%2C4032&ssl=1" data-orig-size="3024,4032" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557864477","copyright":"","focal_length":"3.99","iso":"160","shutter_speed":"zero.25","title":"","orientation":"1"" data-image-title="Aap12 Close Up Of Arm" data-image-description="
Aap12 Shut Up Of Arm
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?fit=225%2C300&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?fit=768%2C1024&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Close-up-of-arm-.jpg?resize=225%2C300&ssl=1″ alt=”Aap12 Shut Up Of Arm” width=”225″ peak=”300″ class=”aligncenter size-medium wp-image-1503″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3008038859″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
I opted for an RB202 with a Cardas 33AWG OFC inner rewire and an excellent OFC external cable. Once I asked Johnnie about the use of the well-liked Cardas incognito wire, he identified that given the number of connections made within the supporting electronics, a single connection adjoining the inner wire to the external is of no significance. And apart from, the inner cable is comprised of hair-thin stranded cable which isn’t solely greater in resistance than a thicker wire, but can also be significantly extra fragile, more prone to RF interference hum than a correctly shielded exterior lead, and the wire can act as a microphone, transmitting airborne suggestions into the arm. The SOFC external cable has an RF defend and non microphonic layer and is coated in a gentle, versatile silicon cowl which makes it notably good for use in a suspended turntable.
<img data-attachment-id="1507" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-right-side-cover-down/" data-orig-file="https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit score":"","digital camera":"iPhone eight Plus","caption":"","created_timestamp":"1557864456","copyright":"","focal_length":"three.99","iso":"125","shutter_speed":"0.25","title":"","orientation":"1"" data-image-title="Aap12 Right Side Cover Down" data-image-description="
Aap12 Proper Aspect Cover Down
” data-medium-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?fit=1024%2C768&ssl=1″ src=”https://i0.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Right-side-cover-down-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Proper Aspect Cowl Down” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1507″ data-recalc-dims=”1″ data-pagespeed-url-hash=”1974239250″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
Also specified have been upgraded horizontal and vertical bearings. These precision bearings are hand chosen from a batch of 100 to fit the particular person bearing shafts and bearing housing. The modifications have been topped off with a new chrome steel rear weight and end stub, and a foam fill to assist dampen the 600Hz ringing in the arm tube.
The arm was bolted to the arm board using 30 mm M3 Allen bolts, which can facilitate the addition of VTA shims should they ever grow to be crucial. I personally consider that Linn’s use of a P clip has extra to do with utilizing the arm cable to stop lateral motion of the sub-chassis than it does to cease the cable interfering with the ‘bounce’ of the suspension. I subsequently drilled a 40 mm gap beneath the arm and dropped the cable straight by means of.
<img data-attachment-id="1512" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-top-view-with-s-of-s-record-on/" data-orig-file="https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557864709","copyright":"","focal_length":"3.99","iso":"320","shutter_speed":"0.25","title":"","orientation":"1"" data-image-title="Aap12 Top View With S Of S Record On" data-image-description="
Aap12 Prime View With S Of S Report On
” data-medium-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?fit=1024%2C768&ssl=1″ src=”https://i1.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAp12-Top-view-with-S-of-S-record-on-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Prime View With S Of S Report On” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1512″ data-recalc-dims=”1″ data-pagespeed-url-hash=”3039958624″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
With the deck assembled I balanced the suspension. I discovered that when utilizing a thick but light-weight felt mat, the platter barely had adequate mass to compress the springs given the size of the bolts. A Linn platter is a kilogram heavier so this comes as no surprise. Fortuitously bonding a plate of chrome steel to the prime of the Thorens platter will deliver it to virtually precisely the similar mass as a Linn platter and is a mod I’ll make quickly. In the meantime it is nonetheless attainable to realize a wonderfully good bounce when the weight of a report is in place.
<img data-attachment-id="1502" data-permalink="https://www.audioappraisal.com/building-the-aap12-thorens-td-150-modification-part-three/aap12-angled-top-view-with-s-of-s-record-on/" data-orig-file="https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?fit=4032%2C3024&ssl=1" data-orig-size="4032,3024" data-comments-opened="1" data-image-meta=""aperture":"1.8","credit":"","digital camera":"iPhone 8 Plus","caption":"","created_timestamp":"1557864721","copyright":"","focal_length":"3.99","iso":"160","shutter_speed":"0.25","title":"","orientation":"1"" data-image-title="Aap12 Angled Top View With S Of S Record On" data-image-description="
Aap12 Angled Prime View With S Of S Document On
” data-medium-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?fit=300%2C225&ssl=1″ data-large-file=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?fit=1024%2C768&ssl=1″ src=”https://i2.wp.com/www.audioappraisal.com/wp-content/uploads/2019/05/AAP12-Angled-top-view-with-S-of-S-record-on-.jpg?resize=300%2C225&ssl=1″ alt=”Aap12 Angled Prime View With S Of S Document On” width=”300″ peak=”225″ class=”aligncenter size-medium wp-image-1502″ data-recalc-dims=”1″ data-pagespeed-url-hash=”2306319227″ onload=”pagespeed.CriticalImages.checkImageForCriticality(this);”/>
This concludes Part Three. In Part 4 I’ll cowl some basic notes accrued over the build of each turntables and sum up with some listening impressions. It’s also highly probably that we’ll carry out future modifications to the AAP12 in future postings, links to which could be present in the Collection Overview.
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