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In this situation, I usually check the voltages at the audio output tube socket. This will usually reveal a problem in the power supply or audio stage. For starters, locate the primary winding of the audio output transformer. Check the voltage on both leads of the primary winding. You should have between 90 and 120 volts there. If there is no voltage on either lead, you have a power supply problem. If there is voltage on one lead but not the other, you have an open primary winding and a new output transformer is in order.
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