[R-390] OT: What's a 2J1626 tube?

[Tim Shoppa]

Kim Herron writes:

>  I've had lots of Mil surplus tubes that have the
> 2J designator in front of the tube number.
> Why?--I don't know the answer.  It's not rare,
> just numbered different.  Maybe somebody else
> out there has an explanation for the extra numbers.

In the RMA system of 1942-1944 era, a "2" means
heater power less than 10 watts, and "J" usually
means magnetron.

Certainly a lot of magnetrons start with 2J. But a
1626 is not a magnetron! "C" is triode, "D" is tetrode,
"E" is pentode, "N" is crystal.

Tim.