>> There was a time when I could hear a particular frequency of about 23 kHz associated with the cathode tube of a TV, but I have not heard it since I was 13 or so??
Flat screen TVs don't use a CRT. :-)
The system used in the US specified a line rate of 15.75 KHz. The flyback transformer operated at this rate to create the voltage that drew each horizontal line on the screen. This xformer is what created the noise you heard.
I used to fix TVs and I lost the ability to hear the flyback when I was about 40.
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