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A later Structured Version of the VT-14 Transmitting Tube.
Thanks to Joe Gruber for sending the images.
The balloon envelope is 35 mm in diameter and, excluding the UV base pins, is 101 mm tall.
Reference: Joe Gruber.

 

Updated March 07, 2020.
shape:balloon construction:pinch type:triode age:pre.1920 base:uv pins:4 pin:
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