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RobtWB is exactly right. Even in the day, under warranty, flyback failures were NOT an uncommon thing. It is impossible to know if Toms operation of his 21CT55 chassis at 420VDC B+ and 27KV HV hastened the demise of his flyback. But EVERY time I turn on one of my "" ancient " TVs, I fear for my flyback transformer. I certainly would NOT recommend operating a vintage color TV at the outside design maximum limits as Tom did, but these old flybacks WILL fail, even at nominal operating conditions. Just the way it is.
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John Folsom
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