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ID = 30748
Great Britain (UK)
Brand: Marconi's Wireless Telegraph Co. Ltd.
Tube type:  Screen-grid Tetrode   Universal 
  <1925 very rare. ***
Identical to FE1_MO
First year 1920 British Radio Valves - The Vintage Years, Thrower
Successor Tubes FE3_MO   FE2_MO  

Base SPECIAL TUBEBASE in general Base on each end.
Was used by Military and/or Government
Filament Vf 4.5 Volts / If 1.5 Ampere / Direct / Battery =
Description Tyne quotes Ia = 1.5 Amp. The valve was used in the single valve ship receiver Type 91, where it carried out the triple function of r.f. amplifier, diode detector and a.f. amplifier. Tube designed by Henry J Round. 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
x 93 x 25 mm / x 3.66 x 0.98 inch
Weight 31 g / 1.09 oz
Information source British Radio Valves - The Vintage Years, Thrower   Pages 64 & 86
Saga of the Vacuum Tube, Tyne   Pages 224 - 227, 380 & 382
FE1_MO: R.O.
Rudolf Osterkamp

More ...
FE1_MO: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

Usage in Models 1= 1920?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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