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The Sodion Tube
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This exhibit is a Connecticut Telephone & Electric Co. J-117. The anode is external and operates by electrolytic conduction through the glass wall. This valve needed a a DC coil to allow it to be tuned.
This is a soft valve and part of the Sodion range.
This came from the Tyne Collection and is quite rare.
The circuit in which the J-117 was used - Tyne.
Thanks to Joe Gruber for sending the image.
The thin glass tube envelope is 16 mm in diameter and, including the base pins, is 108 mm tall.
Reference: Joe Gruber.


Updated November 26, 2020.
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