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ID = 18439
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Gas Triode 
Identical to NGT7 = BT5 = W1290 = CV1147
Predecessor Tubes BT5  

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bc) Top contact with a cap.
Filament Vf 5 Volts / If 5 Ampere / Half indirect
Description British Navy code, later superseded by CV1147 spec. 
Information source Taschenbuch zum Röhren-Codex 1948/49   

fg67_5.png NGT7: Manufacturer's Literature
Emilio Ciardiello

Just Qvigstad

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