Took the amp out of the cab. Shorted the input, and hooked up a 16ohm dummy load resistor. Scope shows 120Hz on the output. Bad solder joint somewhere? Maybe a bad filter cap. Amp is only a 2018. Got to pull the board to work on them, will just order new electrolytics for the power supply before I do that. Tightened the ground screw and transformer mounts while it was out.

Stay tuned for the cap change and board teardown.

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