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ID = 28566
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 FER1_4Volt
Similar Tubes
Heater different:
First year 1925 ?? Saga of the Vacuum Tube, Tyne page 392
First Source (s)
1925 : British Radio Valves - The Vintage Years, Thrower p.51 & 158

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.1 Ampere / Direct / Battery =

Louden valves were marketed by Fellows Magneto Co. Ltd. from 1924 to 1927. Some Louden designations used were F1 and F2 for bright emitters; FER1, FER2 are the  corresponding dull emitter tubes having thoriated filaments.

Information source Saga of the Vacuum Tube, Tyne   page 392
Wireless World (The), London (WW, 79)   June 24th 1925 p652
FER1_4Volt: Fin Stewart
Fin Stewart

FER1_4Volt: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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