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I believe the 12WP4 used in some 1951 Philco sets is a Triode as well, I tried testing it with a B&K & got nothing at all, I probably didn't have it set up right but in any case nada.
I finally just replaced the filters in the chassis so I could fire it up and see what happened, turned out it was OK not great but good enough.
I would suggest recapping your chassis just enough to get some HV and see what happens.
Usually just replacing the filters and the caps on the horiz oscillator will do the trick.
I would be worried about damaging the tube trying experiments on it, also I wouldn't rejuvenate it until I saw it working in the chassis no matter what the tester said.
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