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ID = 15878
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Transmitting Triode, air cooled   VHF 
Identical to HF100 = 4C22 = E703A

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bt)
Filament Vf 10 Volts / If 2 Ampere
Information source Taschenbuch zum Röhren-Codex 1948/49   
  HF100: ARRL, QST Aug. 1938
Götz Linss
HF100: Götz Linß
Götz Linss

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HF100: ARRL Handbook 1972
Michael Schlör

HF100: ARRL The Radio Amateur's Handbook 1941
Götz Linss

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