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I own one of those,in the same cabinet.
I happen to own one of those 29jc20 zenith sets, in the exact same cabinet as yours. mine does work pretty well, although it needs a little attention in the vertical lineraty ckt(probably a cathode bypass cap), and the crt is a little weak, especially the red gun, but i do get a good picture ,and color. on it.
The chassis is the FIRST regular production color set from zenith, a1962 model. It is the ONLY set they made with tube lv rectifiers (the next years chassis the 27, and 26kc20, had SILICON rectifiers, as did all of them after that). You, and I have a real rare item there, I only ran across one other 29jc20, and that was in 1986, behind a car repair garage.(I DID strip the chassis out of it, and STILL have it, today)
By the way, when I got my set home, from its 500+ mile ride from s.c., I had no color, or video, just bright retrace lines. I found that reseating the video output tube, as well as several tubes in the color section, brought everything back. If you hauled yours far, you might want to check this.
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