A tube failed (I measured it with my Sencore TC136 Tube Tester and it had 2 shorts, and everything was out of spec), and had completely desoldered one of the screen grid resistors right off the PCB, leaving it rattling around in the amp!
I replaced both, and to be easier for future service if it is needed, I mounted them on the other side, so that these are easily desoldered (not needing to take out the whole PCB)
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