Behold, robert casey signalled from keyed 4-1000A filament:



There must be 100 tonnes of EF80 or 6BX6 lingering forgotten and
unwanted around the world.
Many were made for the TV IF stages of tube TVs. But they make fabulous
triodes, imho.

Any chance of doing a test on those?


Just be sure that you use "sharp cutoff pentodes". Some TV IF pentodes
were "remote cutoff". Variable gain depending on bias. Great way to do
AVC, but not good for audio work.

Hi Robert,

Why is that anyway?

--
Gregg t3h g33k
"Ratings are for transistors....tubes have guidelines"
http://geek.scorpiorising.ca