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FE7

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ID = 82025
       
Country:
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Space Charge Tetrode   Audio Frequency 
  <1925 very rare. ***
Identical to FE7

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Sidecontact.
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.4 Ampere / Direct / Battery =
Information source -- Collector info (Sammler)   Rundfunktechnisches Handbuch, II. Teil, 1927

b4_tetrode~~7.gif FE7: Fin Stewart
Fin Stewart


Just Qvigstad
fe7_data.png
FE7: H.Wigge, Rundfunktechnisches Handbuch, 2.Teil, 1927, S.183
Anonymous 15 Collector

 

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