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ID = 14407
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Triode, vacuum   Audio Frequency 
Identical to L21
Similar Tubes
Normally replaceable-slightly different:
Other class quality (otherwise equal):

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.1 Ampere / Direct
Information source The Saga of Marconi Osram Valve   p. 329
History of the British Radio Valve to 1940   p. 141 & 166
Taschenbuch zum Röhren-Codex 1948/49

1_91.png L21: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad
L21: Marconi Advertisement
Anonymous 15 Collector

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Usage in Models 1= 1934?? ; 2= 1934? ; 4= 1934 ; 2= 1935 ; 1= 1936

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):10

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