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That CRT will not be hard to find. The 21ALP4, 21CBP4, 21AUP4, 21BSP4 and others were pretty much used in all the mid-50 sets. I know for sure that Motorola, Silvertone and Philco used them in almost all their 21" models 1956-58.
Can you try a good CRT checker to be sure you can't give it a good bump?
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"When resistors increase in value, they're worthless"
-Dave G
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