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ID = 4208
United States of America (USA)
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Transmitting Triode, air cooled   UHF 
Identical to 2C39 = CV3940
Similar Tubes
Normally replaceable-slightly different:
First Source (s)
10.Jul.1946 : Electron Tube Registration List 504
Successor Tubes 2C39A   2C39BA  

Filament Vf 6.3 Volts / If 1.1 Ampere / Half indirect
Description 'Oil can' shape UHF transmitting triode. Glass spacers.
100W max plate dissipation with forced-air cooling. Gain 100, Gm 17000umhos, 500MHz max full ratings operating frequency.
This was the forerunner of the many 'oil-can' power triodes, with glass and ceramic spacers. 
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
  2C39: Diefenbach Amateurfunk Handbuch
Michael Schlör
2C39: Manufacturer's Literature
Emilio Ciardiello

More ...
2C39: Manufacturer's Literature
Emilio Ciardiello

2C39: Manufacturer's Literature
Emilio Ciardiello

More ...

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