Anything Zenith is usually a rarely-needed flyback. I've only changed Zenith fly's in a 14Z8C50 25" console and a 17" set, like 18CC20.
Try finding anything for a CTC15 thru CTC38 color RCA, known as a high failure part. I was lucky to find a fly for my RCA CTC12, great fortune that a VK member had one to sell.
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"When resistors increase in value, they're worthless"
-Dave G
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