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ID = 30896
Tube type:  Transmitting Tetrode, air cooled 
Identical to VT31 = CV1031 = SG250 = ATS250

Base SPECIAL TUBEBASE in general Wires only.
Filament Vf 8 Volts / If 11.25 Ampere / Direct
Description Pa<250W; Va<5kV.
British transmitting tube also produced by Machlett. US production has the code 'VT-31' etched on the bulb and can be confused with the US type VT-31. 
Dimensions (WHD)
incl. pins / tip
160 x 361 x mm / 6.30 x 14.21 x inch
Tube prices 1 Tube prices (visible for members only)
Information source Babani, International Radio Tube Encyclopaedia   
-- Original-techn. papers.   
VT31: Private collection
Emilio Ciardiello

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VT31: Manufacturer's Literature
Emilio Ciardiello

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