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Peak HiFi is a well established business and was formed in 2004 as audio consultants specialising in high quality audio equipment, with a particular fondness for stereo and analogue equipment, we are particularly enthusiastic for classic turntables such as the Garrard 301 and the Garrard 401. Peak HiFi offers a select range of new and approved used equipment, accessories and services. Reconditioned Garrard 301 and 401 units are available as well as beautifully engineered plinths for these decks. We welcome you to visit us at our premises in the Peak District and to take advantage of our relaxed surroundings and two demonstration rooms where we can demonstrate all of the equipment and assist you with your selection. Please call us to fix an appointment.

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Home > Products > Amplifiers > Sugden Audio A21 Signature Series > Sugden Signature A21I

Sugden Signature A21I

Sugden Signature A21I
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A21I  Signature Series 2 Amplifier

Sugden's first commercial amplifier was the A21 in the mid-1960s. It is generally recognised as the first commercial, solid state Pure Class A amplifier to be available for audio enthusists. It was a very special amplifier with a single-ended Class A output configuration and current feedback. This design concept did not appear generally in commercial audio amplifiers until over a decade later. Capable of recreating a musical performance well in advance of its peers, it made the name of Sugden synonymous with musical performance. The true potential of the output configuration was realised in the 1980s when it was coupled to modern components, reduced internal filtering and multi emitter solid state output devices.

The result was an amplifier of extended and more controlled bass and treble but still retaining the wonderfully detailed mid range of the original design. The amplifier became the A21a, a reference amplifier on many continents. Further improvements have achieved significant enhancement of performance and the amplifier has been rebranded as the Sugden A21a Series 2.


This product is available to order only and delivery is approximately 4 weeks. Payment can be made in full at time of order by selecting Add to Basket and Buy alternatively contact us and we can take a deposit with the balance due 7 days before despatch.


Inputs: Four line level, mm/mc phono

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

Remote control: Volume up/down, Earth terminal



Line Input sensitivity: 170mV for max out

Phono input sensitivity : 3mV/mm, 0.2mV/mc for max. output

Phono Loading : MM 47K MC 100 Ohm

Power output : 23 Watts into 8 Ohms both channels working

Frequency response: +/-dB 10Hz-20kHz

Bandwidth: +/- 3dB 6Hz-200kHz

Signal to noise: >83dB

Gross weight (packed): 11kgs

Dimensions: 92 x 430 x 350mm


Product Code: SAA21I

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