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20DP4 and 20CP4 are they interchangable
I have a Philco console (cir. 1953) that uses either a 20CP4 or 20DP4. Number is missing on the old CRT, and Sams lists both, along with a 21 inch tube that I found out doesn't fit. Are they interchangeable? If you have either one for sale that has good emission, also let me know.
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