How to Stop High-Pitched Humming from 70s TV's?

[NoPegs]

Originally Posted by idiotbox

I've got a couple B&W TV's from the 1970s that as soon as I turn them on, emit a painfully high pitched and loud hum. They are a 1975 Quasar and a JVC Model 3240 Videosphere. Is this normal and is there anything I can do to stop/reduce the hum? I have the ears of a dog so maybe others haven't noticed this. It's gotten to the point where I can't be in the same room as the TVs because it is so uncomfortable (which really takes the fun out of putting them to use). I have no clue what exactly causes the hum, but even with the volume all the way down the hum doesn't change. Thanks in advance.

It is the 15.734 kHz horizontal sweep rate inherent in NTSC displays. I share your pain. In grade school I could hear a TV left on from 3 rooms down the hall with the doors open. Even as an adult my hearing still goes up around 17kHz according to the last occupational hearing evaluation I had in 2012.

Or are you experiencing a low frequency hum in the audio circuit? That can usually be fixed, unlike the 15.734 kHz whine.