WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
I can't make out a lot of the internals but it looks like it has beam forming plates, so probably a tetrode. From the size and shape withthe top cap fpr the plate, I'd venture that it is made for high voltage >600V.
I recall venturing across a webpage about gigantic tubes, it was on one of those german websites, either Jogi's Roehrenbude or Burkhard Kainka's website I believe (I'm too lazy to check ).
The article was about one of those gigantic Kriegsmarine WW2 or thereabouts era tubes, it looked awesome, almost exactly like the one pictured but IIRC it had two glass protrusions rather than one (so not just anode but also access to another electrode via bulb rather than underlying socket pins).
This tubes Russian (GMI family) is incredible `Beast`,have huge cathode surfaces beacose is intendet for high voltage Pulse operation(Magnetron Tube Pulse Modulator)(Up to 150KV B+) and if You look good that tube datasheet output power in that pulse operation mode is Huge too.Pitty, in that datasheet You can always found only value for RADAR modulator purpose,nothing else, but that tube is quit good for high power Audio Amps,Radio transmitter,even for OTL Amps(conected triode).Any way if You want to implement this tube somewhere,watch out this:When You cross 12KV anode voltage they start to produce and emit X-Ray, so some kind of protection You must considere.All the best
Exactly! This is outright dangerous! Several members of the German armed forces received high doses of X-ray radiation in the 70ies while servicing F-104G Starfighter and marine Radar gear. Please be careful.