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Pliotron

 
See also:
The Twenty-Kilowatt Tube - Irving Langmuir
    
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This exhibit from 1917 is a further refined experimental Type G Pliotron that led to the CG 886, VT-1 & VT-11. This has a UV base cap with brass skirt. Note the locating pin for the bayonet base.
The tungsten filament was formed into a helix.
From the Tyne Collection.
Thanks to Joe Gruber for sending the image.
The balloon envelope is  mm in diameter and, excluding the UV base pins, is  mm tall.
References: J Gruber & 1047. Type Pliotron was first introduced in 1915.

 

Updated October 20, 2019.
shape:balloon construction:pinch type:triode age:pre.1920 base:uv pins:4 pin:
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