A21 AI S2

Compact in size with a simple but stylish design, the A21 is possibly the only amplifier you will ever need.


5 year warranty
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Finance example

£428.00 initial 20% deposit then £142.67 per month for 12 months. Other finance terms available. Finance subject to status

A21 AI S2


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.

The Sugden A21 Signature is is a modern update of Sugden's classic A21 and A21a amplifiers that became a reference standard on many continents, further improved to offer enhanced performance and available in black or silver. 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.

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.

Tech spec

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

Frequency Response

+/-1dB 10Hz-20kHz

Gross Weight (packed)



92 x 430 x 350mm (hwd)

For more information click here to visit the Sugden website


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