u/Electronic-Spring150

I’m troubleshooting a Sony TA-AX650 integrated amplifier with a persistent buzzing issue.

Symptoms:

Loud rough/raspy buzzing starts immediately when I switch the speakers ON (no input connected). The Buzz is independent of volume and input selection

Audio signal does play, but buzz is always present in the background. Both channels are affected equally

Interesting behavior:

Selecting Speaker A or B → buzz present

Selecting A + B together → buzz disappears completely and the speakers stop working

What I’ve already done:

Replaced main power supply filter capacitors

Replaced bridge rectifier

I want to post a video of the issue but apperntally I cant?