Sorry if this has come up before I've been searching and haven't found much. I have collected a few Crown Series II D-150a amps (all above SN 61000) and it seems channel 1 is usually where a failure has occurred. I don't know the history of the units and I hope to repair them if practicable. I've got one amp that sounds pretty good I use as a reference but on it I find R3/R8/R!0 get notably hot even on light duty. The PCB has heat marks on it as do the other units. How normal is this? I've recessed the resistors from the board increasing wattage, checked output bias/diodes, updated capacitors,, and have the D-150A II service manual to assist. Should these get that hot. Any other tips out there what to check?
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