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I had several customers with those Space Screen sets. All of them ate lots of those resistors on the screen/focus board (330k 1/2watt if I remember correctly). I had one where the blue CRT shattered. Luckily, they didn't have liquid cooling, so no coolant to clean up, just glass. I was always afraid one of those things was going to slam down on my head. (I know, screw drive doesn't do that without power but still....). The convergence circuit on those SUCKED! Hardly any adjustments, IIRC it was all passive, unlike some sets of the day which had several dozen convergence adjustments allowing pretty decent convergence if you spent a little time working on it. I never did think those Zeniths had a decent picture. But, it was BIG....HUGE for those days so I guess people were willing to put up with the other issues.
Last time I saw one was about 3 or 4 years ago, and it looked awful. I finally convinced the guy it was time to get something better.
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