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DV-3A

 
See also:
DV and DL valves - Isolantite
    
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The DV-3A is a dull emitter triode for use with dry cells powering the filament. The specification is close to the UV199 - PDF attached.
The wider bulb allowed the electrodes to be mounted horizontally.
The paper label seen on the glass was introduced about 1925.
Thanks to Joe Gruber for sending the image.
The wide glass tube envelope is  mm in diameter and, including the UV base pins, is  mm tall.
References: Data-sheet & Joe Gruber. Type DV-3A was first introduced in 1925.

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
3.0
0.06
20-80
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated September 22, 2020.
shape:wide.glass.tube construction:pinch type:triode age:1920.1930 base:uv pins:4 pin:
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