Quote:
Originally Posted by miniman82
Electron bombardment, totally harmless. Audio output tubes do the same thing, just watch them with the lights off. If it were even remotely gassy, it would arc over. I wouldn't worry.
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I agree with miniman, but on B&W sets of that era, HV rectifiers glowing excessively on startup was sometimes caused by excessive high voltage until the CRT started pulling it down.
You might monitor the HV during startup to see if this is happening, and if it is, check the HV regulator.
It probably is not the cause, but this check can be cheap insurance.
Jas.