No sooner do I get one thing fixed, than another thing starts to go bad. Lately my fisher 800c has developed an intermitant hum in the right channel. I have replaced all caps, I mean all electrolytics. I was told that plate resistors that are going bad can cause this?
Where would I look to fix this issue? The driver phase inverter tubes or the 7591 outputs.
Am I right concerning the plate resistors.? I swapped the output tubes around as well as the drivers and no change, so I don't think its the tubes. I checked the grounds and they appear ok.
Steve
Where would I look to fix this issue? The driver phase inverter tubes or the 7591 outputs.
Am I right concerning the plate resistors.? I swapped the output tubes around as well as the drivers and no change, so I don't think its the tubes. I checked the grounds and they appear ok.
Steve
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