Need pointers on 65 zenith color roundie 25mc33

[63bird]

Oddly I bought the same crt tester yesterday that's in that link. It's a sencore CR168 big mack.

I don't mind buying a good tube tester here soon. My seco tube tester has been fine for amplifier tubes. I rarely use it though. I've bounced between Hickok, B&K and sencore. There is so many models of each brand.

I'd like to get something thats cheap in price but does a OK job. If I can't find that then I want a really good one which I'd hope to get under $500.00 or about. I hate buying something then regretting I didn't spend X more for better.

Also for this chassis what are typical tubes that go bad? I'd like to buy extras for a rainy day.

I'm a Magnavox nut for thier console stereos. I have a nice stash to keep them going after in gone. I'm 32 by the way. I'm always trying to get younger people in to vinyl. So anything I learn during this process I plan to pass on.

Is there any good tech books I should read?