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A good idea would to grab an AA5 (or any 40's) tube radio and do a recap on that first for practice. If you mess a radio up it will be 1/5 the work tracking the problem down. Tube TV restoration is not a good hobby to start cold unless you have a strong background in analog electronics. I moved from radios to TVs as a teen and it took me a few years of trying, failing, and trying again on various sets to actually succeed
for the first time....
A VCR or RF modulator will supply a signal to the set. If the connection is to be wired (with VCRs and cheap RF mods that is a given) you will need a 75 to 300 Ohm balun (available at radio shack and elsewhere) to match the coax out of the RF source to the antenna terminals. A VCR or RF mod should have A/V inputs (you know the red, white, yellow RCA jacks) that you can connect the A/V outputs of a DVD player to so that the modulator or VCR can convert those signals to RF.
There is no way to test tubes (including CRTs) other than a tube tester, a working chassis that uses the same tube, or....A bunch of power supplies, meters, complex math, tube theory, etc. that will make you wish you had a tester...
Good luck.
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