A21 Pure Class A

The A21 was the worlds’ first production pure class A transistor amplifier and a great success.

The partnership with Richard Allan was short lived and within a year the amplifier was renamed the SUGDEN A21. Shortly afterwards, manufacturing was moved to larger premises in Cleckheaton, West Yorkshire

A21 Pure Class A Amplifier
A21 Pure Class A Amplifier
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© 2020 J E Sugden & Co Ltd.