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Last I heard you said your tuner tube pin voltages were checking OK per Sams, so any drifted resistors really aren't too concerning to me. But I'm only one persons opinion. To me the bigger issue is you really don't have any good method to check signal strength or substitute a known good signal at various points in your set. Personally I like the convenience of a B&K 1077B Analyst. With one you can substitute a Video IF signal and compare that picture with with what you get connecting to the antenna. Basically you'll be able to substitute signals starting at the CRT and work your way all the way back to the antenna. The catch is these units may also need some repairs made to them. But they are relatively common place and also quite inexpensive if you can find one from some place local to you. Quite literally no one needs them today other that a handful of us hobbyists, so there's no good reason they should be anything but dirt cheap, or even free for shipping.
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