Well, brought my tester with, and at first the tube showed little signs of life. For the heck of it, I brought it up to about 7.8V on the tester, let it sit for maybe 30 seconds, and it deflected right up into the mid green. The set has an RCA Silverama 19AP4 in it. I think this tube with a little activation will be just fine
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Oh, and I got the set for $25
I also got 2 huge boxes of Sams folders dating from about 1950-54 or so, along with factory Motorola, Philco, and GE service literature dating from 1948-54 or so, all for an additional $25. Not a bad day at all, I'd say