I will definitely keep this in mind next time I have to re-degauss my last analog CRT TV. last time I did this I did it by hand with a somewhat strong microwave ring magnet. but because of the "quality" of the construction just about any magnet will either add or subtract gausses.

including ye refrigerator magnets!!

the last one we bought was.. how should I put this... cheaply made but somehow survived the lightning strike nearby my old house shortly before we moved. well 3 or 4 power strip/ surge protectors fried, breakers tripped and the DTV converter box power adapter died. the excuse that we would get a new LCD TV when this one died went out the window quite shortly after moving. in the meantime our CRT is the basement tv now and if you look at it strongly it will get weird rainboie colors and need to be re-degaussed.

it certainly didn't help that we lived near strong magnetic fields for 4 or 5 years next to an old-fashioned Hydro dam still in use. ( the clock on my iBookG4 which I used as a TV recording server had a significant!!!!!!!!!! amount of drift, I don't know whether it was from magnetic fields or vibrations affecting the time Crystal. what I do know is it went away after we moved and I ceased needing to constantly re-sync with an NTP server every day. )

the house before that wasn't too bad and I don't know what was up with the basement apartment before that. so yes it's 2018 and we have a 10+ year old TV, one of the last manufacturing batches as I'm sure; that continues to work and we can't kill non-purposefully.