The output heatsink heating up is due to either bad output transistors, too much D.C. at the outputs, or bad bias heatsink transistor. Usually, there is a transistor mounted to the heatsink that adjusts the bias up or down depending on the temp. of the heatsink. That might have failed. It's also possible the bias trim adjustment may have fail or is improperly set. Find a good repair facility in your area and have it serviced. It's probably due for new capacitors as well given it's age.
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- 15 posts total
- 15 posts total