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Does this set have seleniums, if so there could be one going bad as I had low b++ in one of my 7 inch sets because of a bad selenium rectifier. I replaced the 2 with 1n4007 diodes and cured the voltage problem. I had noticed one selenium was much hotter then the other so befor it shorted and and smelled up my house I changed them. Could be power supply caps too but I see your going over the whole chassis so I'm sure you will find the culprit. Does that set have an adjustable ring on the hv rectifier tube, if it has one that will affect the hv output.
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