This months tube is a transmitting beam power amplifier, the 1625.
The 1625 was designed for use as AF amplifier or modulator as well as for RF amplification. Except for the heater it is identical to the 807.
The data sheet also shows the triode connected curves:
Actual curves taken from a tube with the tracer:
These don't look too shabby. Let's have e a look at the tube.
I have some RCA 1625 in the beautiful world map boxes:
Probably the most beautiful tube box ever made.
The tube is wrapped in protective cardboard inside:
Inside the cardboard is some detailed documentation:
Some details of the tube：
More photos of a 1625: