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Electrolytic caps can suddenly go crappy on you. I just had it happen to a '64 Zenith AM-FM H845, I tested the 4-section electrolytic OK, but it just started humming a bit more each day and I knew.....I was not done even though I replaced the wax-papers and put a silicon rectifier/series resistor in place of the selenium. should have been first on the list.
I bet the new 5U4 was putting out a bit more EMF..was there a phfffft sound first?
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