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I notice it too on my vintage black and white sets. Fine tuning helps minimize it but it can still be seen sometimes. It is not a signal source problem as I don't have cable in my house, just rabbit ears on all sets.
I suspect it is coming from the horizontal curcuit, some kind of ringing maybe? I think it is just a design characteristic of b&w sets since the horizontal sections don't need to be as sophisticated as in a color set.
It's like an allergy. You just have to learn to live with it.
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Just look at those channels whiz on by. - Fred Sanford
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