Originally posted by AL78
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Black lead to sleeve of input jack - I don't trust using the chassis in solid state amps as there any many different grounding schemes. I forgot there isn't a speaker jack on this model - use the red speaker lead - take extreme care not to accidentally short the speaker leads together at any time.
Look up a datasheet for a J111 and then the pinout you'll see see which pin is the gate.
HINT: It might be easier to measure the gate voltage at the junction of R34 & R33.
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