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On my 1971 Zenith hybrid I think I added 10-20M in series with the ground as it drifted over a couple of years in the early part of using it as a daily driver over a decade ago. Interestingly it stopped drifting and has been stable for years now.
If the focus divider is off the HV and has a path to ground then it will automatically discharge the HV after a few seconds...A splendid feature of that circuit.
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