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As you point out, Zeniths buzz. They always have buzzed, even when new and on a roof antenna in a perfect environment. Add to that CATV and closed caption subcarriers, and you gotta granddaddy of a buzz! Even Chromacolor II sets buzzed sometimes.
As far as trying to combat it, I never found any total success other than VERY CAREFULLY adjusting the audio detector slug, and fooling with the buzz pot. Then you get it perfect on most channels, and one channel will buzz you out of the room.
My advice to anyone with a vintage Zenith as a daily watcher, is to pick the sound from a cable box or VCR, to a stereo. My flat chassis 25DC56 buzzes on anything with a text crawl at the bottom, but I've been used to it since I got the set at the Salvation Army store in '81.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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