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Mstaton, I have the same chassis, faceplate and screen size set in a console cabinet, mine had an RCA branded 22JP22 in it too, but it had an obvious RCA cateract on it.
You may or may not have read of the botched cateracting I did on that tube that resulted in the bulb being comperomised beyond hope for rebuilding.
It is possible that the origonal Zenith tubes were a defective run, and that they instructed service men to switch to RCA while they tried to find what went wrong.
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