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I know how you feel. I was once given a 27" Magnavox TV (back when a 27" set was still worth trying to sell) that had a broken PC board. I spent hours running jumpers across all the breaks. I turned the set on just to discover that the shadow mask inside the CRT was damaged. All I got was rainbows all over the screen. I'll never go to that much trouble fixing a broken chassis unless I have another chassis that I can use to test the CRT.
I wouldn't toss that Zenith just yet. If the tube number starts with A48, it's a 19". If it's an A51, it's a 20". Many of those 19" and 20" tubes from other brands of TV's will interchange. You'll be OK if the mounts are the same, the socket is the same, and the yoke will fit the neck properly. Many times, I've used CRT's out of other brand sets in a Zenith. By doing this, I actually made the set better than it was when it was new.
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