Quote:
Originally Posted by ohohyodafarted
It's a metal cone crt. No sub for it.
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They used to have a kit for installing a 21ZP4, in place of a 21AP4 in RCA sets. It worked really great.
The 21MP4 is an electrostatic focusing tube. It can be subbed by a 21AP4, but you have to use a magnetic focusing unit.
I depends on what make of set it is. I've converted a few other makes.
