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Wayne may have it. The house connected items are visually stable. No flickers, sudden bright bulbs, window AC's choking, etc. I only noticed it after my 21CT55 was acting up on the line connection. On a variac it calmed down but I diagnosed a faulty RF modulator for that problem. A variac analog meter did show some excess on the line side. On the regulated side it was fine at 115vac. But what causes peak voltage to float up and down? Beyond my basic AC knowledge.
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“Once you eliminate the impossible...whatever remains, no matter how improbable, must be the truth." Sherlock Holmes.
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