Watch out for mice.....OMG!!!

[Electronic M]

Well you could connect a battery of about the same voltage the filaments are rated for to the filament of a tube then use a separate battery and a lightbulb connected both ways to test for forward current, and reverse blocking. And do the same for the other tube.

If you have a spare octal base lying around you could probably wire each tube in turn to the base like a similarly specked octal based HV rectifier tube, and then use the test settings for the octal tube to test it in your tube tester.