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ID = 15214
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: Amperex; New York 
Tube type:  Transmitting Triode, air cooled   VHF 
Identical to 4C22 = HF100 = CV2987
Similar Tubes
Normally replaceable-slightly different:

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bt)
Filament Vf 10 Volts / If 2 Ampere
Description VHF RF heating triode; grid out from side. Mu 23, 75W plate dissipation.
RMA registration of Amperex HF-100, March 15, 1943. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
Tube Lore (I)   
4C22: Manufacturer's Literature
Emilio Ciardiello

4C22: Manufacturer's Literature
Emilio Ciardiello

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