I recently noticed one channel on my amp's heat sink is extremely hot while the other channel is slightly warm; I don't know if its always been that way or something has happened. Any ideas on what can cause this and what I can do to correct? The amp is vintage 1988. Thanks.
If it is still playing music without distortion or hum, then it could be:
1) Abnormal load on one side.. shorted coils? Remove the speakers to see if condition persists.
2) Bias needs setting... check the bias on both channels ensure they are within 1-2 mVdc across the TP or across the emitter resistors for both channels. I forget the exact setting but 10mVdc across the tp seems fine as reference.
3) If Bias is ok, then One channel has some oscillation that would require a more indepth check up...
1) Abnormal load on one side.. shorted coils? Remove the speakers to see if condition persists.
2) Bias needs setting... check the bias on both channels ensure they are within 1-2 mVdc across the TP or across the emitter resistors for both channels. I forget the exact setting but 10mVdc across the tp seems fine as reference.
3) If Bias is ok, then One channel has some oscillation that would require a more indepth check up...
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