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ID = 28561
Great Britain (UK)
Brand: Louden Valves (tubes) - see also Fellows; London
Developer: Louden Valves (tubes) - see also Fellows; London 
Tube type:  Triode, vacuum   Audio Frequency 
Identical to FE1_Louden
First year 1925 ?? Saga of the Vacuum Tube, Tyne page 392

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Direct / Battery =

Thrower calls it F1 and has data for it. Either Tyne or Thrower may be in error.
Louden valves were marketet by Fellows Magneto Co. Ltd. in 1924 and 1925. Some Louden designations used were FE1 and FE2 for bright emitters; FER1, FER2 and 0.06 designated dull emitters having thoriated filaments.

Information source Saga of the Vacuum Tube, Tyne   page 392
Radios von gestern, 4. Auflage   Seite 217
British Radio Valves - The Vintage Years, Thrower
FE1_Louden: Fin Stewart
Fin Stewart


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