Old tube TV's had a power transformer, and a hard on/off switch in there either in the remote receiver or on the front panel, and that power transformer was your surge protector, I use the 1:1 ratio of the same thing/size as they used to be, for a surge protector on my L/Rm TV and my computer in the LRm also.....
take a HELL of a shot/surge to knock out an old set.....but reliable?? hardly....I used to fix them in the 60's-70's by '80 they all gave up, Zenith being the last company to give up after a class action suit against Japan Inc......for dumping....I got outta the trade and went to engineering tech work.....that lasted 5 years...and at that point it was all sold south, so I GTFO on electronics for a living.....
I brought an old Zenith vertical/modular chassis with me 20 years ago, my own custom build, just like my cars....cabinet and all.....finally the CRT went out, and off to Shirk it shitty for a newer model.....then to Wallyworld for the first large flat screen now in the BRm......it runs fine with the back off as it's much cooler, the one in the LR is about 2 years old now ~48" only paid like 400 bux for it..... but I know full well these PWM/chopper power supplies are highly fragile to any electrickery coming down the line....
