Behold, AA5JJ signalled from keyed 4-1000A filament:

I am looking for a tube tester that will check a "4D32" I have a old
army tube tester and it is the TV-7 but it will not check the 4D32.

I know the old Knight I had did.

Ask on rec.audio.tubes, one of us "rodents" there might have one for
sale ;-)

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca