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ID = 15687
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Transmitting Triode, air cooled   Universal 
Identical to CV1222 = NT39 = AT75 = ACT6 = 813_Triode
Predecessor Tubes ACT6  

Base Jumbo 4-pin bayonet (Codex=By) Top contact screw type.
Was used by Military and/or Government
Filament Vf 10 Volts / If 1.65 Ampere / Direct

75W max plate dissipation, External anode with integral finned radiator. Large 4-pin bayonet base.
1500V max operating voltage, amplification factor 22
37MHz max frequency for 75% anode rating.

Dimensions (WHD)
incl. pins / tip
x 210 x 51 mm / x 8.27 x 2.01 inch
Weight 332 g / 11.71 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
-- Original-techn. papers.   Data sheet 11/6/47
CV1222: Ebay UK auction item 201934999375 20thcenturycharlie
Howard Craven

CV1222: Manufacturer's Literature
Emilio Ciardiello

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