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I wonder if the squealing you're speaking of is the flyback transformer? Aren't they sometimes known for making a squeally-ringing sound... some more than others? I have '72 Zenith black & white set that makes an more than obvious high-pitch noise... moreso than others. It's done that ever since I got the set several years ago. It does, however, remain constant. I think you mentioned that yours comes and goes.
Seems I recall reading somewhere that shoving a piece of sturdy paper in the middle of the flyback can dampen the squeal. Anyone else hear of this? Am I on the right track here?
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Charlie Trahan
He who dies with the most toys still dies.
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