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This exhibit is a VT-21 that came from the Armstrong collection. The details are hand written on the base cap.
Thanks to Joe Gruber for sending the image.
The envelope is 29 mm in diameter and, including the base pins, is 79 mm tall.
Reference: Joe Gruber.


Updated September 22, 2020.
shape:wide.glass.tube construction:pinch type:triode age:1920.1930 base: pin:
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