Zenith H2447R 19" Porthole TV

[Electronic M]

Some sets like to make more horizontal stage noise than others. Some of my tube sets I can't hear the whine, others when audio is muted I can tell they are on from the next room. I had a ~2007 Sharp that was the worst I've ever heard....I could hear the high pitched whine from that clear across the house I lived in back then (distances you'd have to shout at your loudest to be heard across)....That set ran for at least 5 years like that before being donated or sold in working condition.

I'd keep an eye on Horizontal cathode current and grid drive as well as boost voltage. As long as those are within tolerance may as well run it as is...It may get better. If something genuinely is wrong with the fly worst case scenario it will let go eventually. If it stays as is it is long term then it is probably just fine (perhaps a bit annoying, but fine).