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I've seen that on many older sets, not just Zeniths. They weren't designed to have the captions and boxes displayed as we have today, and they don't filter that "noise" out of the sound so well. You can try swapping out the IF module, or even VERY SLIGHTLY turning the sound discriminator transformer slug (located on the IF board, if that set has one that's adjustable). Be sure to count and mark exactly where the slug was set, and frankly, I'd want a spare IF module lying around in case you get the alignment all screwed up accidentally.
All of my 70s Zeniths have buzzed somewhat when displaying boxed text and sharp white objects.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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