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Old 27th May 2007, 10:59 PM   #1
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Angry fisher 800c intermitant hum

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
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Old 28th May 2007, 04:16 PM   #2
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Join Date: Mar 2007
Smile problem fixed

Found loose coupling cap at output stage. Sorry for hastle and unnecessary thread.


Steve
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