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VT31

Sensibly equivalent to:
ATS250 CV1031 CV1357 SG250
    
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This valve is labelled VT-31 as an American service code but was made as a UK VT31. The Mullard commercial equivalent is the SG250.
The American VT-31 (commercial Type 31) is a triode on a UX4 base - quite different.
Our guess is mid 1930s for its design date. The output is probably in the low HF region.
See also VT31 and CV1031 for details.
The American VT-31 (commercial Type 31) is a triode on a UX4 base - quite different.
The balloon envelope is 152 mm in diameter and is 381 mm tall.
References: Data-sheet, 4043 & Wireless World.

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
11.25
8.0
5,000
PDF scanned from an original document held by the museum
Updated September 10, 2020.
shape:balloon construction:pinch type:tetrode age:1930.1940 base: pin:
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