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DV-3

 
See also:
DV and DL valves - Isolantite
    
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The De Forest DV-3 is a dull emitter triode probably with a filament consumption of 60 mA. The paper label on the glass was introduced in 1925.
The original can stating that the use was for detection and amplification.
Thanks to Joe Gruber for sending the images.
The wide glass tube envelope is 32 mm in diameter and, including the UV base pins, is 105 mm tall.
Reference: Joe Gruber. Type DV-3 was first introduced in 1925.

 

Updated September 22, 2020.
shape:wide.glass.tube construction:pinch type:triode age:1920.1930 base:uv pins:4 pin:
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