Crown Audio PB1 460CSL Amp

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I replaced all the electrolytics on the main board.. same problem Channel 2 works perfect Swapped out U104 & U204 same problem Seems to be a -bias issue If I turn down the input on channel 1 input the hum is tolerable but has to turn up the gain to it to balence it out... any help would be great! I failed to mension that it hums even with no inputs hooked up

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