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Guide :Music : Electric Guitar

On power up there is a loud humming even with volume at 0

I have a Yamaha G100-212Guitar Amplifier. It didnt work when I first got it. I replaced both of the power output transisters.Powered up and played the guitar for about 5 minutes. Then I turned it off and I turned it on again there is this loud humming noise. I have the schematics. Any suggestions whats causing the noise?

Research, Knowledge and Information :



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