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Interesting albeit simple thing to note on this TV--For years I used a zenith 19cc19 as a daily watcher. That is a 4 tube hybrid chassis. Anyway one day I switched it on and it came up with a huge picture like you noted. Also bad focus etc. Upon measuring anode volts and checking the horiz ckt, I noticed the HV adjustment pot. It was as simple as that...the thing had dead spots in one part of its rotation. I didn't dare clean it, but replaced it with a Coilcraft part and it has been rock solid ever since
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