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Cool!!! It's a "good day" when you can find a set that's 1) small 2) cheap 3) a Zenith! Those sets are pretty durable and it sounds like your problems are mostly tube related. It's sounds like your horizontal output tube needs changed. But that tube is expensive so I'd check it first. If it's bad, that could cause your HV Regulation, foldover, AND focus problems. The on-off again color problem is most likely a tube. I don't think Zenith used 6GH8's in that set, but it's been years since I've seen one of those so I can't remember the tube layout. The "buzz" has got to be a sync/agc tube, which would cause the "buzz" and could cause the "on-off" again color as well. As for the "hue", the set probably needs the control cleaned and possibly the set needs "re-tracked" As in example of how much testing all the tubes can make a HUGE difference, I just got a 1967 RCA B&W portable off eBay. The set "worked" but the contrast and focus seemed a tad crappy AND you had to fine-tune it all the time. I took the back off and discovered the set had never been worked on, and fully expected many bad tubes. I checked em all, and lucked out and only had 4 bad ones. Both "IF" tubes and both tuner tubes. Got the tubes yesterday, popped em in, and man.... I didn't expect that huge of an improvement. Now I've got great contrast and focus and I can pull in tons of stations! In your case I'm sure tube replacement will solve most, if not ALL of your problems. Again, what a great find!!!!!!
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