I have tinnitus. I don't recommend it

I can hear the high frequencies of cathode ray tubes, and generally feel like I hear much higher frequencies than others.

That’s just normal, but when I’m tired or stressed, my blood pressure is up, or I’m sick, it’s what most people probably classify as tinnitus and is at a much lower frequency, more of a high pitched tone.

I also used to be able to hear CRTs. I didn't know what it was for a long time, and then I figured out I could "hear when the TV is on".

Oh, yeah. 15 kHz whine from NTSC CRTs did used to be a thing for me. Eventually I lost that range of my hearing.

A few years ago I fired-up a 15 kHz monitor for my Apple II and my then 5 y/o daughter held her ears and complained that there was a terrible screeching sound that hurt her ears. Between losing the top-end of my hearing with age and the end of CRTs being mainstream display technology I'd forgotten about tube whine.

The whine you hear is not actually from the tube itself, but generated by the flyback transformer.

https://en.wikipedia.org/wiki/Flyback_transformer