Yamaha Amplifier Repair

This amplifier has returned to my desk four years after my first repair. I have found a link between the operation switch and the fault, which i explore in this video.

[@Theoobovril]

Nice work, David.

[@DavidHallettProjects]

Thanks

[@frankowalker4662]

I'm puzzled as to why they would make it switchable from Class AB to Class A in the first place. (esp from the front panel). Those micro-switches look to be pretty standard, they should be easy to replace. (you could play your intro/outro music through the stereo to demo it)

[@DavidHallettProjects]

Yes I agree, it is a weird set up and a weakness, maybe added as a gimmick. Maybe listening to quite classical music may benefit from lack of crossover, who knows. Thank you for your comments Dave

[@andrewlittleboy8532]

Class A sounds better but obviously less absolute power

[@DavidHallettProjects]

@andrewlittleboy8532 Yes, but you need good kit to appreciate it. Maybe the type of music benefits. Thank you for your comment.