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HE4

Information - Help 
ID = 28587
       
 
   
Tube type:  Triode, vacuum   RF/IF-Stage 
Identical to HE4
Similar Tubes
Heater different:
  HE6
First year 1924 Saga of the Vacuumtube, Tyne page 393
First Source (s)
1923 : 70 Years of Radiotubes and V.
1924 : British Radio Valves - The Vintage Years, Thrower p.59

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 5 Volts / If 0.15 Ampere / Direct / Battery =
Description Hersteller: Penton Engineering Co., GB 
 

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