And I see a 4th of those caps hiding next to an IF can on the upper left. And the black caps and an old electrolytic as well.
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So, I got the 21ESP4 up on the bench for a test. It certainly works, but I don't think it's as bright as it should be considering it tests like new.
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DavGoodlin above mentioned that your new CRT 21ESP4 wants something like 590VDC on I think it was G2, and the old CRT wanted about half that. Found it:
http://www.bunkerofdoom.com/tubes/sy...RTS/21DEP4.JPG And the TV set chassis would be providing what the old CRT wanted, and that might be making the new CRT be dim. If so, you might be able to hack together some form of voltage doubler off the flyback winding that's making the current G2 voltage source, to make something to feed the new CRT G2 pin. Or maybe there's a source of voltage intended for focus you could use.
Try your 21CEP4, it looks like a better match
http://www.bunkerofdoom.com/tubes/sy...RTS/21CEP4.JPG