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Correction: I misread the schematic. The 560ohm resistor that is pulling the voltage down on V105 is R113. It goes to pin 8 in parallel with a 20uf electrolytic.
With R113 connected, and R178 disconnected, I have about 80V.
With both R113 and R178 connected, I have about 25V B+.
With both R113 and R178 disconnected, I have the required 260V B+.
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