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I hope I'm not drifting too far off topic. I'm posting some info on the Sylvania RF HV supply, it's possible problems and solutions. Maybe there's some similarity to the Hallicrafter.
When you adjust the HV they have you tune to the high capacity side of the HV curve. It seems to help compensate for whatever changes happen as it warms up. I haven't been able to come up with any convincing ideas about why this works.
They started with a 6SN7 and switch to a 6Y6. I do know that trying various 6Y6's is important. Ones that test the same perform quite differently.
John
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