I also have a tube tester. Those tubes are used in guitar amps, old vocal amps., old radios, TV's and CB radios (Like Browning) Ham radio's, and Ham radio Amps. or should I say vintage. I have worked on all those.
MF
I think they are like those old CRT TV's.....you shoot them and if they make a loud popping noise they were good.
Simple, if they do not work there are broke.
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