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Massive old vacuum tube, anyone know what it is?
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amyk:
Could it be X-ray related?
LaserSteve:
I'm down to a  hf/vhf TR/ATR tube or a large Kenotron or Hard Rectifier.  May I see a picture or two of the base?
Cyberdragon:

--- Quote from: bsfeechannel on July 13, 2021, 01:53:58 am ---
--- Quote from: macona on July 13, 2021, 12:55:22 am ---Oh, I realize that, my lathe is from that time period. But there are just parts here that scream production pieces to me. Plus this is a very small school, even smaller back then and I have seen a lot of their other glasswork and brought some of it home and non if it is anything like this.

Sent a message over to radiomuseum, we will see if they respond. Crossing my fingers.

--- End quote ---

You can also try this guy. He claims to have a collection of more than 4000 lamps and tubes. In fact I found a tube that is very similar in shape to yours, i.e., it has two opposite electrodes, two glass bulbs, and a middle ring.



According to its datasheet, it is used to "decouple the receiver from a common transmitting and receiving antenna during a period of transmission".

--- End quote ---

Already looked there, nothing matches.

I agree it is a prototype, but who made it and for what purpose remains to be seen.

The constuction is very odd, seeming to be a mishmash of different tubes. I still think it is some form of RF diode or oscillator. It's not a cold cathode thyratron, two terminals have continuity, and the OP says there is no mercury pool. It is possible it's some weird reflex klystron. I don't think it's a kenotron or other very high voltage rectifier, there does not seem to be enough of a gap, a high current rectifier seems more likely if that's the case.

The little bulb could be a titanium getter as suggested. They may have intended to melt it off once evacuated but found tiny leaks so left it on to keep it from getting gassy.

Try applying a bit of power to the small filament. That might tell us if the tube is gassy or not.
LaserSteve:
Gently remove the Faraday Mixture, which is Pitch, Beeswax, and Iron Oxide or Copper Oxide and look for a part#.
The Faraday Mix is a remarkable vacuum sealant used in the days B.E. [Before Epoxy].

Any testing may make it valueless to a collector.
coppercone2:
Oh, if its not looped around its not a flow thing

however a flow thing would be interesting in some kind of gas tube
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