Was ist das?

pjp · 22nd September 2010, 06:29 AM

What sort of tube is this ?

karsten21 · 22nd September 2010, 06:52 AM

Hey pjp

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

Karsten

TheGimp · 22nd September 2010, 12:59 PM

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?

Wavebourn · 22nd September 2010, 05:05 PM

Is it a vacuum relay? Or thyratrone?

TheGimp · 22nd September 2010, 05:08 PM

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.

Arnulf · 22nd September 2010, 09:46 PM

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).

FLT · 23rd September 2010, 10:14 AM

Quote:

Originally Posted by pjp

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

banat · 23rd September 2010, 07:19 PM

[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.

pjp · 24th September 2010, 06:17 AM

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

TheGimp · 24th September 2010, 12:56 PM

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.

22nd September 2010, 05:05 PM	#4
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Is it a vacuum relay? Or thyratrone? __________________ The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity!

22nd September 2010, 09:46 PM	#6
Arnulf diyAudio Member Join Date: Feb 2009	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). __________________ mod verb, transitive /mod/ to state that one is utterly clueless about the operation of device to be "modded" and into "fixing" things that are not broken; "My new amplifier sounds great so I want to mod it."

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22nd September 2010, 06:52 AM	#2
karsten21 diyAudio Member Join Date: Jan 2010 Location: Germany	Hey pjp Well, looks like a tube :-) And the background shows that you have more than one of them... Karsten

22nd September 2010, 12:59 PM	#3
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	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?

22nd September 2010, 05:08 PM	#5
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	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.

23rd September 2010, 07:19 PM	#8
banat diyAudio Member Join Date: Dec 2009 Location: near Belgrade	[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.

24th September 2010, 12:56 PM	#10
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	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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