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I have the same model RCA and it too had a bad crt with extremely low emission. I never found a 21amp4a during the couple of years it ran on a brightener, but I was able to put in a nearly-new 21cbp4 without much fuss- I simply removed all of the magnetic focusing hardware. I don’t remember this tv ever really giving issues as a daily watcher, other than the board that has the vertical output section on it had some bad cooked traces, corrected with some point to point jumpers.
Edit: looks like the ETF has a couple of 21amp4s.
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