How picky are CRTs about the 'cleanliness' of the mains power?
Cleanliness referring to electrical noise from thing like ac motors in fridges, powerline ethernet, etc. Cleanliness is also referring to the squareness or 'sine-ess' of the ac waveform, when powering from UPSs.
Pickiness refers to the CRT (my case being a 1985 JVC TV set) acting abnormally in anyway, from minor picture/sound distortions to hardware damage (lowered power efficiency by itself isn't abnormal behavior for the purpose of this question), as a result of say, a square mains wave (from a UPS).
So are CRTs fine with the dirty power most home UPSs provide?