Mine is like the old fly back transformer whine in tube TVs.
That's just what mine sounds like. And having sensitive hearing I've always been able to hear that high pitch from a CRT TV immediately if one is in the vicinity. Like, as soon as I'd walk in to someone's house, or in to a store, even if the sound was off that transformer whine was blazingly obvious to me.
BTW, there was a good thread we did when another member complained of hearing sensitivity, likely hyperacusis.
I had a wicked flair-up of my hyperacusis due to having an air-show - various jets - flying low overhead, and I've been treated for over a year now. I was given tiny hearing-aid type devices that don't amplify sound but instead push a carefully modulated type of white noise in to my ears all day long to re-orient my auditory system. Seems to have worked pretty well so far as most of my hyperacusis is gone. (And of course I take them out to listen to music. With the devices out my hearing is as good as ever).