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ID = 19934
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 rare.
Identical to KL1_MO
Similar Tubes
Heater different:
First year Oct.1928 - - Manufacturers Literature Date of Marconi Publication No. 520A.
First Source (s)
Sep.1928 : - - Manufacturers Literature leaflet

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Sidecontact.
Was used by Radio/TV-reception etc.
Filament Vf 3.5 Volts / If 2 Ampere / Indirect / Specified voltage AC/DC
Dimensions (WHD)
incl. pins / tip
56 x 130 x mm / 2.20 x 5.12 x inch
Information source - - Manufacturers Literature   Pamohlet 243
History of the British Radio Valve to 1940   p. 173
KL1_MO: Manufacturer's Literature
Emilio Ciardiello

KL1_MO: Telefunken Werkstattbuch
Wolfgang Bauer

KL1_MO: own collection
Peter den Boer

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