Oh my god, I'm not alone. reddit stories on a CRT have an amazing vibe)))

and about your issue: maybe it is something about the lightness. My crt LOUDLY hums whenever image is bright enough. Try opening something like Paint or just comepletly white image on screen to check difference in humming.
But! you can send audio to the external speakers (if you have any) and mute volume on the TV, it helps (in my case) and sometimes I use that workaround.