this post was submitted on 16 Jun 2024
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Not sure you follow: even if the primary frequency is out of range, a harmonic (half the frequency, quarter the frequency, etc) can simultaneously exist with the primary.
I suppose its possible with a low quality CRT that has poor construction, leaving loose parts or thin plastic fins that can vibrate at harmonics of a lower frequency, but high quality CRTs don't have this issue.
Extra or louder noise does not occur in normal operation of a correctly functioning flyback transformer circuit. Any frequency or harmonic (vibration) that occurs that is not the specified frequency of operation of the flyback transformer is caused by a problem in the circuit. A brand new CRT with known good parts will not have any kind of extra harmonic.
I had to replace a flyback transformer because it was too loud, and it was a pretty simple job. Hardest part was finding a new flyback transformer. After replacement, the noise volume was reduced to normal levels.
Look, I know what I heard. And that was every old school screen I’ve ever encountered. What I don’t know is harmonic or flyback transformers.
Maybe maybe it’s a ntsc vs pal thing? I’ll restate, I don’t know anything about the tech but I could tell if a screen was on.
And before you restate that they were low quality: maybe every screen I’ve ever encountered was shit, yea. But then shit was the default apparently.