#Amplifier_Speaker.

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Sugden Masterclass SPA4

Power Amplifier

Masterclass SPA-4 Stereo Power Amplifier & MPA-4 Balanced Mono Power Amplifier

The popularity of the Masterclass series has resulted in over seventeen years of continuous production. Offering an excellent price/performance ratio it is easy to see why it remains so successful. With an abundance of headroom, the MPA-4 mono power amplifiers deal easily with heavy complex music, allowing the low level detail to be heard clearly and accurately. Boasting a fully balanced circuit design, it can be the engine room of a fully balanced hi fi system.

The SPA-4 is a stereo version of the MPA-4 and uses the same class A circuit. The only differences are power output and the additional flexibility of both single ended and balanced inputs. Not every music lover can accommodate two substantial power amplifiers in their listen space, so a single SPA-4 could be the solution. One of the noticeable abilities of the SPA-4 is how well it works with smaller loudspeaker designs as well as large ones. Control and soundstage are two key elements of the SPA-4 making it a fine power amplifier.

SPA-4

Facilities

Inputs ​                                    Stereo line level, stereo balanced

Outputs                                  Stereo pair multi-way locking binding posts

Specifications

Input Sensitivity                      1Volt for full output

Power Output                         75 Watts into 4 Ohms both channels working

Frequency Response             +/-0dB 15Hz-30kHz

Bandwidth                             -3dB points 2Hz-200kHz

Signal to Noise                       >85dB

Gross Weight  (packed)         25kgs

Dimensions                           250 x 430 x 350mm (hwd)

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Sugden Masterclass SPA4.

Contact: 9433001006, 9831163529.

email: info@skstraders.net.

Website: https://skstraders.net/

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Sugden ANV 50 Master Class

Contact: 9433001006, 9831163529.

email: info@skstraders.net.

Website: https://skstraders.net/

The Masterclass ANV-50 is a new integrated amplifier released to celebrate Sugden Audio’s fiftieth anniversary.

It is a unique design with many innovative features and specially developed audio circuits.

In 1967 Sugden released the world’s first solid state pure class A amplifier, the A21.  The ANV-50 promises to revisit this golden age of British audio engineering, with a design focused on the demands and preferences of today’s audio enthusiast and music lover.

The ANV-50 has at its heart, a pure class A amplifier and this is coupled to an advanced ‘ideal’ final output stage.  This unique two stage amplification system guarantees our signature pure class A sound, with the ability to drive the vast majority of loudspeaker systems.

The sophisticated final output stage features a comparator and correction circuit so that errors which could occur in the power output section due to varying loads and distortion, are corrected to match the output of the high impedance input amplifier.  Whilst maintaining the signal authenticity, it also increases the load stability and forces the output impedance to zero.  This special output stage with Sugden Error Correction has extremely low open loop output impedance with a resultant high damping factor at quite high frequencies. It also benefits from overall Current-Feedback.  

The power amplifier and pre-amplifier are fully DC coupled so there are no capacitors in the signal path to interfere with or deteriorate the sound quality. One of the key features of Sugden Class A amplifiers is the power supply.  Because they have a high standing current and power reserves, the output is always ready to act instantly to any signal.  This is unlike a conventional Class AB amplifier that waits to receive power through a transformer and a bridge rectifier.  The ANV-50 takes this one step further by using a 1 MHz switching power supply which acts instantly to deliver the power as the Pure Class A amplifier section is always on.

The power supplies are high current, fast and incredibly stable.  With a MTBF (Mean Time Before Failure) of 100 years they are designed for longevity and reliability.

ANV-50

Facilities

Inputs                                     Five line level operated by relays

Outputs                                  One pre-out (variable), one tape out

                                               One pair of stereo multi-way binding posts

Volume Control                      Remote control (RC5 handset included)

Specifications

Line Input Sensitivity              110mV @ zero attenuation for full output

Power Output                         50 Watts into 8 Ohms both channels working

                                               100 Watts into 4 Ohms both channels working

Frequency Response            +/-1dB 12Hz-45kHz

Bandwidth                              8Hz-86kHz

Signal to Noise                       >85dB

Gross Weight  (packed)        11kgs

Dimensions                           143 x 430 x 370mm (hwd)

J E Sugden & Co Ltd, Heckmondwike,

The manufacturer reserves the right to change specifications without notice.

As the ANV-50 is an integrated amplifier it has an internal pre-amplifier, developed specifically for this               amplifier.  The circuit is a line drive design and uses the minimum number of components, all of which are high quality.  This provides a very open and natural sound and demonstrates that when carefully engineered, less can be more.

When the ANV-50 does not receive an input signal it has a very low power consumption of only 20 Watts, making it extremely efficient.  As the heatsinks are mounted internally with minimum contact to the outer case it only runs slightly warm to the touch.  

Loudspeaker matching with the ANV-50 should never be a problem.  With an output of 50 Watts into 8 Ohms that can double in to lower impedances, room size and loudspeaker sensitivity becomes less of an issue so a much larger range of loudspeakers can be enjoyed.

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Sugden A21 SE Signature Integrated Amplifier.

Contact: 9433001006, 9831163529.

email: info@skstraders.net.

Website: https://skstraders.net/

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Sugden Master Class IA4

The  IA-4 is our flagship and most popular integrated amplifier.  Weighing a substantial 20 kilos the IA-4 has a purposeful look and impressive build quality. Plenty of input and output facilities are on offer including a high quality phono stage. The class A power output circuit has been upgraded from the A21 series with a larger power supply and improved soothing and output capacitors. Gold plated circuit boards, full relay switching and a precision input selector switch offer further detailing. The pre-amplifier section of the IA-4 is a bespoke design, with surprising clarity and detail.  The most noticeable feature is the ability to create a large performance with depth and height on any type of music.

Facilities

Inputs ​                                  Three line level, tape, MM phono, balanced

Outputs                                Variable pre-out, fixed out, loudspeaker out

Volume Control                    Remote control RC5 compatible

Tape                                     Monitor and record off

​

​Specifications

Line Input sensitivity            125mV

Phono Input Sensitivity        2mV (MM)

Power Output                       33 Watts per channel

Frequency Response           +/-1dB 14Hz-200kHz

Bandwidth                            6Hz-300kHz

Signal to Noise                     >84dB

Gross Weight  (packed)        20kgs

Dimensions                         165 x 430 x 440mm (hwd)

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Sugden Master Class IA4.

Contact: 9433001006, 9831163529.

email: info@skstraders.net.

[skstraders]

Sugden A21 SE Signature Integrated Amplifier.

Contact: 9433001006, 9831163529.

email: info@skstraders.net.

Website: https://skstraders.net/

Design：2.5-way vented-box

Frequency Response：35Hz-30kHz

Sensitivity (2.83V/1m)：89dB

Impedance：4 ohms (minimum 3.2 ohms)

Power Requirement：50-200W recommended

Tweeter：Model: APR2.2. Sandwich aluminum ribbon tweeter, the size of aluminum ribbon(LWT):60mm×8.5mm×0.015mm. High power handling, shielded design, easily field-replaceable for the ribbon.

Midwoofer: Model: AC165/DC35F1, 1×165mm (6.5″). Aluminum frame, the compositecone(PP, carbon and mica), 35mm (1.38″) copper clad aluminum voice coil with flat wire, the special magnet system, 120mm×20mm Y30 Ferrite magnet.

Woofer: Model: AC165/DC35F1, 1×165mm (6.5″). Aluminum frame, the compositecone(PP, carbon and mica), 35mm (1.38″) copper clad aluminum voice coil with flat wire, the special magnet system, 120mm×20mm Y30 Ferrite magnet.

Crossover Frequency：1200Hz and 3200Hz

Crossover’s Attenuation Slope：Woofer -12dB, Midwoofer -12dB, Tweeter -18dB

Crossover Components：High quality MKP capacitors and non-polarized electrolyticcapacitors. Also, high purified OFC inductors and the metal oxide film resistors with military industrial standard.

Connective Cable：OFC cable

Damping Material：The polyester fiber and the PU foam

Connections：4 pcs gold-plated copper connectors, Bi-wiring

Cabinet Material：High quality MDF

Finish:The standard finish is Cherry PU matt paint and Rosewood PU matt paint.

Dimensions (HWD)：1070mm×254mm×317mm (42.1″×10″×12.48″).

Net Weight：24.5kgs/pc (54lb/pc)

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Sugden A21 SE Signature Integrated Amplifier.

Contact: 9433001006, 9831163529.

email: info@skstraders.net.

Website: https://skstraders.net/

[skstraders]

Sugden A21 Signature Integrated Amplifier.

Sugden A21 Signature Integrated Amplifier.

Class A Integrated Amplifier.

Contact: 9433001006, 9831163529.

email: info@skstraders.net.

Website: https://skstraders.net/

The Sugden pure class A design provides affordable high-end performance from a beautifully engineered single box integrated amplifier.  Compact in size with a simple but stylish design, the A21 is possibly the only amplifier you will ever need. With many of the original A21’s still in daily use after fifty years, it could also last a life time. Providing a large soundstage and depth to all types of music, the A21 is an amplifier you can listen to for hours without fatigue.  The single ended voltage rail circuit provides impressive dynamics and incredible bass.

The A21 Signature integrated amplifier is available with or without a MM/MC phono input. Without a phono input it is designated the A21L (line input only). A21aL models can be fitted with a phono input at a later date.

​Facilities

Inputs ​                                   Five line level (four on A21 Integrated)

Optional mm/mc phono

Outputs                                 One pair of stereo multi-way binding post  Pre-out (variable), tape out (fixed)

Remote Control                     Volume up/down

  Earth terminal Specifications

Line Input Sensitivity             170mV for max. out

Phono Input Sensitivity          3mV/mm, 0.2mV/mc for max. output

Phono Loading                      MM 47K MC 470 Ohm

Power Output                       23 Watts into 8 Ohms

Frequency Response           +/-1dB 10Hz-20kHz

Bandwidth                             6Hz-200kHz

Signal to Noise                      >83dB

Gross Weight  (packed)       11kgs

Dimensions                           92 x 430 x 350mm (hwd)

[skstraders]

Sugden A21 Signature Integrated Amplifier.

Class A Integrated Amplifier.

Contact: 9433001006, 9831163529.

email: info@skstraders.net.

Website: https://skstraders.net/