Sugden A21 Signature - Audiophile Integrated Amplifier

by Sugden
Rs. 296,000.00

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 circuit provides impressive dynamics and incredible bass.

James Sugden, widely accredited with producing the world's first Class "A" amplifier under the name of Richard Allen, a most famous brand of English loudspeakers in the 1960's, went on to bring his own name to his amplifiers after 3 years of production for Richard Allen.SUGDEN were established in 1967 founded by James Edward Sugden who designed and manufactured the worlds first pure class A solid state commercial amplifier. Since then they have been exporting their products to many countries around the world and winning prestigious awards.

In the vinyl analogue tradition Sugden Audio is truly a founder and icon of what has made analogue technology famous for it's natural and atmospheric sound that envelops the music listener in a three dimensional holographic experience.It is an extension of the analogue renaissance that continues to reintroduce us to what was engineered but for vaying circumstances not introduced to the wider music-loving audience.The fact that they have transcended several decades to be here to compliment the resurgence in the atmospheric sound of analogue and vinyl is a testament to their truth and depth of their passion and technology.

The natural question here is what is a Class "A" amplifier? In simple terms a Class "A" amplifier has all output devices conducting at all times as against a Class A/B design which switches the conducting devices on and off as required.For the music listener this results in the Class "A" amplifier being available to reproduce the dynamics and nuances of the music more readily resulting in a more realistic musical performance.

This is only the beginning of the Sugden story.They have been creating Sugden amplifiers in the same Yorkshire factory for a long time, and their operation is reportedly so self sufficient that they still manufacture their own casework and solder their own circuit other words.....they are hand made. Sugden employees are well described as craftsmen and craftswomen.

The Sugden A21with phono was the first commercially produced Pure Class "A" solid state amplifier launched in 1967 and is still offered today.The A 21 has changed a lot over the last 50 years due to the improvement of electronic components but the simplicity of the Class "A" circuit has remained.

A worthwhile benefit of the Sugden A21a Signature Pure Class ‘A’ Integrated Amplifier is the optional Moving Magnet/Moving Coil phono stage. The A21a MM/MC is fully discreet which means no IC’s (Integrated Circuits) are used thus the components are individual transistors, resisters, etc. Left and right channel are also fully separated. It has facilities for both moving magnet and low output moving coil cartridges. The design also has automatic impedance matching so no load adjustment is necessary.

In 2011 The Absolute Sound and Hi-Fi+ included the Sugden A21 in its list of the ten most significant European Amplifiers of all time. In the prelude it said: “Europe has a rich heritage of audio, and picking ten of the most significant products is always going to be an exercise in omission…. But arguably – and such things are argued in perpetuity – these 10 amplifiers have changed the face of audio significantly in their own right”.


  • Inputs – Five line level with MM/MC phono board
  • Outputs – Pre-Amplifier Out (Variable), tape out (fixed) and one pair stereo multi-way binding posts
  • Remote Control – Volume up/down
  • Earth terminal


  • Line Level Sensitivity – 170mV for maximum output.
  • Phono Input Sensitivity – 3mV/Moving Magnet, 0.2V/Moving Coil for maximum output.
  • Phono Loading – Moving Magnet 47K, Moving Coil 100 ohm.
  • Power Output – 23 watts per channel into 8 ohms both channels working.
  • Frequency Response – 10Hz to 20kHz +/- 0.5dB.
  • Bandwidth – 6Hz to 200kHz +/- 3db.
  • Signal to Noise – >83db.
  • Nett Weight – 11kg.
  • Dimensions – 92mm x 430mm x 350mm (HWD)

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