I grew up with TVs and still can hear most of the CRT sets. It's because, IIRC, the horizontal sync frequency is around 15KHz which is higher than what most people hear. The sound gets significantly louder when the TV loses signal. The same happens with NTSC/PAL frequency computer monitors (I restore and collect vintage computers, so I have a healthy collection of those).

Oddly, some higher resolution screens (XGA and above) also emit a high pitch noise. Unless there is some frequency multiplication going on, they shouldn't.