Tubes tend to usually be good as found in most radios, and maybe just a tiny fraction bad in most TVs.......If you find a set in the wild with a large portion of the tubes bad then you may want to worry about the possibility that some calamity caused their destruction along with other parts.
To illustrate I have a Blauplunkt console from around that vintage that had the cord cut and most of the tubes blown......After replacing them it worked great except for the AM band which is dead....Someday I'll try and track the issue down, but most likely it got hit by lightning or a power surge while running on the AM band.
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