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After sleeping on it, it occurred to me that the plate lead is in series with that 68 ohm resistor so there's no potential difference to cause any arcing between them.
What I think is more likely is that the wire is stressing the phenolic board and flyback.
The CRT isn't quite as bright as I expected considering it tests like new and is aluminized. Perhaps that's because the HV is only 12kV for the original 17AP4 while a 17BP4 typically sees 14kV.
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