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ID = 28565
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Space Charge Tetrode   Text 
  <1925 very rare. ***
Identical to FE3_MO
Similar Tubes
Heater different:
First year 1925 Saga of the Vacuum Tube, Tyne page 382, 383, 385
First Source (s)
1924 : British Radio Valves - The Vintage Years, Thrower p.67
Predecessor Tubes FE1_MO  
Successor Tubes DE7  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Sidecontact.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.7 Ampere / Direct / Battery =

Anode 6-20 V. Inner grid 6-15 V. For special circuits. For H.T.less circuits, Unidyne receivers.

Dimensions (WHD)
incl. pins / tip
45 x 115 x mm / 1.77 x 4.53 x inch
Information source Saga of the Vacuum Tube, Tyne   1925 Brown Brothers Catalog 217
- - Manufacturers Literature   1924
FE3_MO: Saga of the Vacuum Tube - Tyne
Gerhard Eisenbarth

FE3_MO: Fin Stewart
Fin Stewart

FE3_MO: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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