Originally posted by Drummer4gc
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Because it seems to be ok with no load, I think the output transistors are more likely the issue.
The 4 power transistors furthest to the right are the outputs. The other 2 of the same type are the drivers. Not sure if they are socketed or soldered in. For test purposes you could remove a pair at a time and apply the load to try and isolate if any of them are bad.
So you would remove 1 output from the positive side and one from the negative. If no change, put them back and remove the other pair.
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