Hey pjp
Well, looks like a tube 🙂 And the background shows that you have more than one of them...
Karsten
Well, looks like a tube 🙂 And the background shows that you have more than one of them...
Karsten
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.
Power transmitter tube for HF maybe.
Might be suitable for output tube, might not.
No numbers on the tube or box?
Power transmitter tube for HF maybe.
Might be suitable for output tube, might not.
No numbers on the tube or box?
Would a vacuum relay have a plate like structure? The few I've seen do not, but I've only seen three or four vacuum relays.
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).
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).
Looks like you nailed it! Thank You.
With your input and a bit of googling I think I now know what it is - a GMI-90 Beam Tetrode in its Socket.
More pics here: 4hv.org: Forums / Projects / GMI-90 Project ideas
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Wow! That tube is bigger than I thought. From the first picture I figured it was about 5" tall and 2-1/2" in diameter. I bet it is more like 10" tall and 6" in diameter.
You can get 40Ma at 30KV out of a Neon Sign Transformer, but I sure don't want to try working with it.
175W in heater supply alone means it will be a real power hog.
You can get 40Ma at 30KV out of a Neon Sign Transformer, but I sure don't want to try working with it.
175W in heater supply alone means it will be a real power hog.
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.
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