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Old 22nd September 2010, 06:29 AM   #1
pjp is offline pjp  India
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Default Was ist das?

What sort of tube is this ?
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Old 22nd September 2010, 06:52 AM   #2
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Hey pjp

Well, looks like a tube :-) And the background shows that you have more than one of them...

Karsten
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Old 22nd September 2010, 12:59 PM   #3
TheGimp is online now TheGimp  United States
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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?
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Old 22nd September 2010, 05:05 PM   #4
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Is it a vacuum relay? Or thyratrone?
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Old 22nd September 2010, 05:08 PM   #5
TheGimp is online now TheGimp  United States
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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.
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Old 22nd September 2010, 09:46 PM   #6
Arnulf is offline Arnulf  Europe
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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 :P ).

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).
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Old 23rd September 2010, 10:14 AM   #7
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Quote:
Originally Posted by pjp View Post
What sort of tube is this ?
High Voltage Thyratron

(Sorry for my bad english)

Look at the top cap: No sharp edges, everything is round to avoid corona.
The edge of the cap is folded back to the cap for corona protection.

This tube was made for really high voltage.

regards
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Old 23rd September 2010, 07:19 PM   #8
banat is offline banat  Serbia
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[QUOTE=What sort of tube is this ?[/QUOTE]

Thats the Russian (GMI family) of high voltage RADAR modulator pulse tetrode tube.I use similar tube for midle power AM trasmitter long time ago.
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Old 24th September 2010, 06:17 AM   #9
pjp is offline pjp  India
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Quote:
Thats the Russian (GMI family) of high voltage RADAR modulator pulse tetrode tube.
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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File Type: jpg GMI-90 Socket.jpg (27.9 KB, 157 views)
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Old 24th September 2010, 12:56 PM   #10
TheGimp is online now TheGimp  United States
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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.
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