If a specific set seems to bloom with the loss of hv then I'm sure when they were new they didn't have that problem, maybe because a cap that was not sized right for the hv section back in the day maybe failed after maybe 2 years and then after 50 years for sure it probably won't work so then why not find the problem or design defect and then that would be the end of that. Being both you guys seem to have the same problem and does look like a mistake was made in the design.
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