Russian 6p31s tubes

hidnplayr · 2nd September 2009, 10:35 AM

I have recently acquired some russian tubes (6P31S) to find out if they have the same nice triode characteristics as the el36 does.
Now I noticed these tubes dont have the barium (or whatever it is) mirror at the top, or side of the tube.

This seems to be normal for these tubes, as i have seen by the pictures on the internet, but i was wondering how these tubes keep their vacuum this way.
They seem to have something instead of a normal gether at the top of the tube, it look like a small cup filled with grey powder.

For a picture, see here: http://www.jogis-roehrenbude.de/EL34...-EL36-6CA5.jpg

Ty_Bower · 2nd September 2009, 12:15 PM

I've seen some Russian 6550 with those weird pellet getter contraptions. I've wondered how they work... hopefully someone here will know.

Colt45 · 2nd September 2009, 08:38 PM

Some russian toobs have these pellet getters. They seem to work fine, but I've never really seen them on western tubes for some unknown reason.

Matt.B.H. · 2nd September 2009, 08:53 PM

This is a guess but being attached to the anode would allow them to be heated nicely. Another guess would be that they would not be used in small signal valves.
Cheers Matt.

sorenj07 · 21st October 2009, 08:55 PM

Any updates on this tube?

Zibi · 21st October 2009, 09:16 PM

Lempos

2nd September 2009, 10:35 AM	#1
hidnplayr diyAudio Member Join Date: Sep 2008	Russian 6p31s tubes I have recently acquired some russian tubes (6P31S) to find out if they have the same nice triode characteristics as the el36 does. Now I noticed these tubes dont have the barium (or whatever it is) mirror at the top, or side of the tube. This seems to be normal for these tubes, as i have seen by the pictures on the internet, but i was wondering how these tubes keep their vacuum this way. They seem to have something instead of a normal gether at the top of the tube, it look like a small cup filled with grey powder. For a picture, see here: http://www.jogis-roehrenbude.de/EL34...-EL36-6CA5.jpg __________________ Real tubes have top-caps

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2nd September 2009, 08:38 PM	#3
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	Some russian toobs have these pellet getters. They seem to work fine, but I've never really seen them on western tubes for some unknown reason.

2nd September 2009, 08:53 PM	#4
Matt.B.H. diyAudio Member Join Date: Jul 2009 Location: Cheltenham	This is a guess but being attached to the anode would allow them to be heated nicely. Another guess would be that they would not be used in small signal valves. Cheers Matt.

21st October 2009, 08:55 PM	#5
sorenj07 diyAudio Member Join Date: May 2006	Any updates on this tube?

21st October 2009, 09:16 PM	#6
Zibi diyAudio Member Join Date: Jan 2006 Location: Bialystok	Lempos

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