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Yamaha M-80 natural sound power amp.

My repair man has determined a few transisters to be defective, has replaced them, and when he fired it up, they blew out again. So he has asked me for a manual or schematic for it, but do not have either. So my question is a acquire them somewhere to help aid him with the repair. Can you help me, please?

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Have you resolved this issue wit with M80 Amp? This amp has a unique DC path and if it is several years old, some caps and diodes go bad. In most case the power transistors are not bad when the protection light comes on. I bought my M80 in Germany back in the mid eighties and had to do some repairs in the last 5 years but it still works hard.

Posted on Sep 01, 2008

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