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ID = 17065
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Transmitter Triode, liquid-cooling 
Identical to 4228A = CV1450 = CV734
Similar Tubes
Normally replaceable-slightly different:

Filament Vf 22 Volts / If 41 Ampere / Direct /
Description 5KW plate dissipation wit external water-cooled jacket. Pure tungsten filament, exact operating voltage marked on each tube. Equivalent of the industry standard 228A. 
Text in other languages (may differ)
Literature Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   

4228A: Manufacturer's Literature
Emilio Ciardiello

4228A: own collection
Peter den Boer

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