Sugden A21 Series 3

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bwg

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Joined 2009
I have just discovered that Sugden in the early 70's produced a series 3 A21. It looked exactly like the usual A21 series 2 even had 'Class A Amplifier' on the front panel but it was actually a high bias 25 watt a/b amplifier. Way to tell was the power transistors on the rear heatsinks had a cover over them. Any one got any info on this series 3?
 
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