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ID = 47407
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Transmitting Triode, air cooled 
Identical to CV1231 = NT57

Filament Vf 15 Volts / If 48 Ampere / Direct
Description The very early triode specifically deeveloped for radar application in GB: designed in 1936 by H.G.Hughes of Signal School, it had a short anode, to reduce its capacity and increase the frequency; the twin filament cathode granted high emission.
Used in Type 79 shipboard early warning radar and in the early MB2 ground radar sets.
In 1939 GEC and Signal School modified the filament, using thoriated tungsten, with a relevant emission increase. In the past, it was commonly accepted the use of pure tungsten in high voltage tubes. 
Information source -- Original-techn. papers.   
-- Original prospect or advert   Callick, Metres to Microwaves
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