Quote:
Originally Posted by Kamakiri
How the heck do you test them?
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Good question! Since it is unlikely that your tube checker (or any that I know of) has settings for the tube, I would just check the filament with an ohm meter... should be about 1.2-1.3 ohms (I just measured four of them). If you apply 1.25 V to the two filament pins, you should see the spiral filament (inside the plate area) glow. I don't think that I have ever seen a bad one in a vintage 'scope.
jr