Loquah · 12246
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Did the high voltage switch to the other large PC board? If you rotated the middle board and the high voltage went from IA to IB on the small PC board, then you would swap the large PC boards to see if the offending voltage follows one of the high current C4S boards.
OK, so the high OA voltage on the big PC board stayed put when you switched the big boards around. Did this big board OA voltage also stay the same when you flipped the small board 180 degrees?
Does the 6AQ5 glow in that socket?
Can you verify that the resistance of the little blue resistor between 5 and 6 on that 7 pin socket still measures appropriately?