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ID = 16372
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Developer: Standard Telephones and Cables Ltd. (STC); London, Foots Cray 
Tube type:  Triode, vacuum   UHF 
Identical to S25A = CV16
Successor Tubes S28A  

Filament Vf 4 Volts / If 0.65 Ampere / Half indirect
Description The very early disc seal triode specifically developed in Great Britain to operate in a grounded grid amplifier. Anode to grid clearance 0.6mm, cathode surface 3 by 6mm.
Gm 6.5mA/V at 6.5ma anode current, gain 100.
The tube was introduced early in 1941 and standardized as CV16. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
-- Original-techn. papers.   Callick, Metres to Microwaves, pgs. 43 to45

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