I have heard about single ended power stages in certainly models from the A21 series. Who know, which newer models and where I can get schematics?
Here some common information about Sugden, that I have found:
Sugden Audio: A21SE
Richard Allan Class A amplifiers
The Original Sugden A21
The J. E. Sugden A51 Power Amplifier and C51 Control Unit
6moons audio reviews: Sugden A21SE
http://www.precide.ch/test/sugden_A21 SE Image Hifi_2006.pdf
Here some common information about Sugden, that I have found:
Sugden Audio: A21SE
Richard Allan Class A amplifiers
The Original Sugden A21
The J. E. Sugden A51 Power Amplifier and C51 Control Unit
6moons audio reviews: Sugden A21SE
http://www.precide.ch/test/sugden_A21 SE Image Hifi_2006.pdf
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