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PRNDL · December 22nd, 2007, 04:18 PM

It could be any of the tubes, or the power supply circuit.

The easiest test is to tap on each tube and listen. Bad ones will usually make some sound.

Usually an amp tech begins by measuring all of the voltages, including power section and tubes.

December 22nd, 2007, 04:18 PM	#4 (permalink)
PRNDL Tele-Meister Join Date: Jun 2007 Location: SW Florida Age: 46 Posts: 132	It could be any of the tubes, or the power supply circuit. The easiest test is to tap on each tube and listen. Bad ones will usually make some sound. Usually an amp tech begins by measuring all of the voltages, including power section and tubes.