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ID = 57818
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Transmitting Triode, air cooled   Power/Output 
  <1925 very rare. ***
Identical to AT50
Similar Tubes
Other base:

Base SPECIAL TUBEBASE in general Top contact screw type.
Was used by Military and/or Government
Filament Vf 7.3 Volts / If 2.6 Ampere / Direct / Battery =

50 watt transmitting tube made for the British Army by MOV, Edison-Swan, BTH and A.C.Cossor Ltd. Three "foot" style connections on base (base known as S3). Anode from a top screw terminal.

Dimensions (WHD)
incl. pins / tip
75 x 195 x mm / 2.95 x 7.68 x inch
Weight 170 g / 6.00 oz
Information source British Radio Valves - The Vintage Years: 1904-1925   Pages 77-78 & 86

at50.png AT50: Fin Stewart
Fin Stewart

Collection of



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