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ID = 28563
Tube type:  Triode, vacuum   RF/IF-Stage 
Identical to FE2_Louden = F2_Louden
First year 1925 ?? Saga of the Vacuumtube, Tyne page 392

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 5 Volts / If 0.4 Ampere / Direct / Battery =
Description Thrower calls it F2 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. 
Text in other languages (may differ)
Literature Saga of the Vacuumtube, Tyne   page 392

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