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i have seen a bazillion rca tubes-they will produce a very nice picture as long as its decent.sylvania,zenith,philco also made great tubes of that vintage. did your tech check the crt? sometimes a good cleaning will do wonders. i have jolted those rcas back to life many times. never had luck with the sylvanias or philcos though. seems like zeniths are never bad. if you need a tube( 25v?)there are still more than a few around.good luck!
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