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ID = 46642
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Beam Power Tube   Text 
Identical to CV1257 = NT100
Predecessor Tubes E1155  

Base Jumbo 4-pin bayonet (1918) Top contact with a cap.
Was used by Radar
Filament Vf 8 Volts / If 6 Ampere / Half indirect

Air-cooled power tetrode intended for use in radar modulators. 4-pin jumbo base, glass bulb with anode radiator.
12KV max anode voltage, 60W plate dissipation.

Information source - - Manufacturers Literature   

Just Qvigstad
CV1257: Manufacturer's Literature
Emilio Ciardiello

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