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Massive old vacuum tube, anyone know what it is?

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macona:
Picked up this old vacuum tube, its rather large. I think it might be a diode, look like 3 terminals, the base, ring, and what I am guessing is the anode. The base and ring are electrically connected together with a very low resistance so I think that is the heater. The "anode" is hollow so I am guessing water was flowed though it to keep it cool, or maybe just for surface area and save on weight and material.

I think the getter pump on the side was added, this came from a glass display at a local university.

Anyone seen anything like it? The cutting mat it is on is 1" increments and 1/2 squares. So about 21" long

Old vacuum tube by Jerry Biehler, on Flickr

gbaddeley:
Thyratron or Mercury Rectifier? A Triode of this size would have a ceramic or metal case, not glass.

Stray Electron:
A rectifier tube would be my guess.  Look closely and see if you don't see some tiny drops of mercury in it.

amyk:
My guess is something for radar use.

T3sl4co1l:
What's the extra bulb thing, is that kind of behind, is it really connected..?

A few more angles also showing inside the electrode structure maybe, might be informative.

Tim

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