What can I do to "field test" a roundie I plan to purchase

[Robert Grant]

I am embarking on buying a circa 1963 color TV receiver whose owner is honest enough to describe as "not working". I would want to have some idea of what is and what is not wrong with the set before I agree on a price and move the set about 100 miles.

Sadly, I do not have a CRT tester at my disposal. I do have an old (receiving) tube tester, two digital multimeters, a DTV converter box that can run on batteries, and assorted "unconventional" test gear (e.g., an AM radio to detect video amp activity, and VHF handi-talkie that could detect local oscillators).

Any suggestions on other things to do to evaluate the set at the owner's house would be most appreciated, thanks.

P.S.: Detroit, MI area.