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Old 2nd September 2009, 10:35 AM   #1
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Default 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:
Real tubes have top-caps
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Old 2nd September 2009, 12:15 PM   #2
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I've seen some Russian 6550 with those weird pellet getter contraptions. I've wondered how they work... hopefully someone here will know.
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Old 2nd September 2009, 08:38 PM   #3
Colt45 is offline Colt45  Serbia
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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.
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Old 2nd September 2009, 08:53 PM   #4
Matt BH is offline Matt BH  United Kingdom
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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.
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Old 21st October 2009, 08:55 PM   #5
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Any updates on this tube?
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Old 21st October 2009, 09:16 PM   #6
Zibi is offline Zibi  Poland
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