[sdiy] calling tube gurus...this old rare one has the most peculiar filament problem

[KA4HJH]

>Yeah I don't get heater on the new tube.  It's dc measurement on the fat
>pins (this is an old style 6pin.  I think it is very similar to a type
>75 tube)

Good guess:

>Japanese. Triode-diode with the old 6-pin prewar base.
>http://www.radiomuseum.org/tubes/tube_6zdh3a.html
>No American exact equal, but a 75 can be used by rewiring the base.

-- 

Terry Bowman, KA4HJH
"The Mac Doctor"