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Does your friend has a schematic for this set??
Somewhere, I have one of those "rca fix-it manuals", the little one with the "fold-out" style. I seem to recall it talking about this problem. Likely, something in the commutating ckt of the flyback or such. That cap that is "between the trace and commutating ckts" of the HV ckt was known to fail sometimes. (it is NOT an electrolytic, a polyester--film type or such.)Also--the yoke--return cap fails sometimes too. This is some type of "special foil-type", 1.5UF or such. Perhaps leaky SCR's too. Screwed--up H. drive will cause"latch-up" on the SCR's and trip the breaker too. Also--have you unloaded the HV quadrupler?? This would trip the breaker if bad--and kill the HV.
I'll see if I can find one of my manuals tomorrow. I have TWO of these sets...one in a VERY nice cabinet, and one with a not-so-nice cabinet. Both work--to some degree.
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