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Ahhh.. you must have gotten Zenith’s first rectangular set. You’ll know if it has a round screens convergence assembly on it. (sliders instead of knobs). That one is a GREAT set. As a matter of fact.. that chassis was the first vintage set I owned as a kid. My Uncle got it on trade (1978) and it was a Space Command. Surprisingly.. the flyback was bad, so I had him replace it, and then.. I had him install a Chromacolor picture tube. (boy.. what a difference that made)
Anyway.. got 10 more years out of it.
As for the “green halo”.. don’t worry about it. ALL Zenith tubes did that, even when they weren’t that old. RCA tubes always developed cataracts, and Zenith had the halo, which in my opinion is the lesser of the 2 evils. Has nothing to do if the tube will be good or not. You’ll just have to see how the picture is, or test it on a CRT checker. Zenith called that generation of color tubes the “Sunshine Tube”, and then they went to the Chromacolor series. The Sunshine version wasn’t bad, but in my opinion, didn’t produce an outstanding picture.
Good luck on it, and hope to see some screen shots!
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