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Pliotron

 
See also:
The Twenty-Kilowatt Tube - Irving Langmuir
    
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This exhibit from 1918 is a refined experimental Type G Pliotron. The markings are VT-1 & NX4. This design led to all of the Pliotrons that followed. It has a UV base cap with brass skirt. The locating pin is not visible in this image.
Western Electric made a VT-1 and General Electric made the VT-11.
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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