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I've never bothered to research the full story. The only hot chassis TV sets I've ever seen have always been imported European models that carried numerous warning labels on the back cover stating they were hot chassis (and usually a lamp holder with a small bulb mounted on the cover, not sure why).
I remember that many repair shops would not take these sets, and if you had one you had to find the nearest "European specialist". I don't think this part was required in any way, it was just that most shops were unfamiliar with them and didn't like working on them.
I've seen some off brand cheap color sets from the 80s that were obviously a 120V hot chassis that had been fitted with an internal stepdown transformer.
I remember finding an mid 90s US model Sanyo that ended up here somehow (probably brought over by someone who didn't realize it wouldn't work here). Compared to every other set it was just so weird - though I think the lack of AV inputs on such a recent set and use of those hex head screws that I didn't have a tool for weirded me out more than the hot chassis.
Going back further I remember an article in an old magazines decrying the evils of series string sets (unsafe, inefficient, something about power factor) when one manufacturer tried to introduce them. I've never seen such a set or even a picture of one, so I guess the campaign was successful.
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