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ID = 11016
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Beam Power Tube 
Identical to CV57

Base Jumbo 4-pin bayonet (1918) (Codex=Fn) Top contact with a cap.
Was used by Radar
Filament Vf 12.6 Volts / If 1.75 Ampere / Half indirect / Specified voltage AND current AC/DC

Power tetrode intended for use in radar modulators. 11KV anode voltage, -800V grid cutoff bias, 5A peak anode current.
base: Jumbo 4-pin with bayonet (U4J)
1 - Control grid
2 - Heater
3 - Screen grid
4 - Heater and cathode

Text in other languages (may differ)
Information source Babani, International Radio Tube Encyclopaedia   p. 234
-- Original-techn. papers.   
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

cv57_sock.png CV57: W.H.
Wolfgang Holtmann

Just Qvigstad
CV57: Manufacturer's Literature
Emilio Ciardiello

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