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RE: The lm317 is a constant voltage source

OK, that sounds like you have it wired as a current source. The problem is, 1.25/19.6 is only 64 mA. You need more than that to center the EL34s in Class A. Does it motorboat even at low levels (without the cap), or just above a certain threshold? How much voltage is on the cathodes at idle? What mode is this amp - pentode, UL or triode? Are there grid stoppers on the output tubes?

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