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ID = 30853
Great Britain (UK)
Brand: Louden Valves (tubes) - see also Fellows; London
Tube type:  Triode, vacuum   Audio Frequency 
Identical to FER1_6Volt
Similar Tubes
Heater different:
First Source (s)
1925 : British Radio Valves - The Vintage Years, Thrower p.51

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 6 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.

Literature Saga of the Vacuum Tube, Tyne   page 392
The Wireless World, London (WW, 79)   June 24th 1925 p652
FER1_6Volt: Sammlung
Anonymous 557 Collector

FER1_6Volt: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

Collection of a member from D

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