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RE: The lm317 is a constant voltage source

Hi, JKt, yes, in its cathode bias w/resistor, the amp was running 70ma at the cathodes. I thought that was too high so i dialed it back a little. The amp is running UL mode but there are no grid stoppers on the suppressor grids. There are 1K resistors on the input grids. As soon as the amp received a signal, it started motorboating.

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