Gregg wrote:
Behold, Ashhar Farhan signalled from keyed 4-1000A filament:


the greatest valve mixer ever was based on 7360.


snip

How true!!

There were also some tv tubes used in chroma demodulators
that were sorta 7360 ish. The 6AR8 for one, I know there
were a few others.

BTW you had to use mu-metal shields on these for best
results.