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Good advice all: output tube going bad, bad caps in the audio circuit. Easiest is to try another tube. Another thing to look for is the cathode resistor on the output tube. It may have changed value and thus changed the bias on the tube. Measure ohms cold and compare to the color code on the resistor, should be within 20% if resistor is good.
Reece
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Reece
Perfection is hard to reach with a screwdriver.
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