Hello all,
The situation is a bit different than I originally stated - I skipped two sections regards the diode on the PS board, and the 2.49K resistors on the shunt regulator board. So my prior readings are meaningless.
I installed the missed parts and had a bad reading on A of 171.5V, and a good reading on B of 219.0V. I detached the shunt board and revisited each solder, and each step around the D tube socket and board. I found a suspect attachment for a ground wire at 31U, cleaned up a few connections I didn't like, and removed excessive solder. I didn't find any additional errors. I double-checked that the correct wires were going to and from the right locations. I checked all the jumpers on the back of the board.
Reassembled everything and similar result. That's disheartening, but leads me to think I have a bad part or attachment on the A side of the shunt regulator board. Tube is glowing, four LED glow. I also swapped out the 12AU7 to make sure that wasn't the culprit.
Relevant voltages, below. Any help is appreciated, as I'm not sure of the best way forward.
A side:
MJE5731A tab = 171.7V
Kreg = 0.361V
Breg = 171.7V
B side:
MJE5731A tab = 219.0V
Kreg = 2.480V
Breg = 219.0V
Voltage off the PS board at +275 = 284.0V
Regards,
Ed