Quote:
Originally Posted by Tom9589
I hope you meant to say that you have a 21YP4 instead of a 21ZP4. The 21YPA is an electrostatic focused tube while the 21ZP4 is a magnetic focused tube like your 20CP4.
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Actually it is a 21ZP4A, thanks for pointing that out.  an original 1953 RCA with the hex number stamped on glass where the ion trap goes.
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Last edited by DavGoodlin; 06-29-2022 at 08:33 AM.
Reason: re-checked CRT - not a 21YP4
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06-28-2022, 04:08 PM
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