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F1_Louden

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ID = 30849
       
Country:
Great Britain (UK)
Brand: Louden Valve (Brand), Fellows Magneto Co. Ltd.; London
Developer: Louden Valve (Brand), Fellows Magneto Co. Ltd.; London 
Tube type:  Triode, vacuum   Audio Frequency 
Identical to F1_Louden
First Source (s)
1924 : British Radio Valves - The Vintage Years: 1904-1925 p.32 & 185

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.4 Ampere / Direct / Battery =
Description

Tyne calls it FE1. Either Tyne or Thrower may be in error.  Fellows/Louden advertisements of the 1926-27 period refers to them as F1. The FE series were introduced as dull emitter equivalents.


Louden valves were marketed by Fellows Magneto Co. Ltd. from 1924 to 1927.
The F1, F2, F3, Bright emitters were replaced by the near equivalent FEx1, FEx2 and FEx3 series in 1926-27.

 
Information source Saga of the Vacuum Tube, Tyne   P. 392

b4_base_pins.png F1_Louden: Fin Stewart
Fin Stewart


Just Qvigstad
f1_louden_spec.png
F1_Louden: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

 
louden_f1_nvm.jpg

 

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