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AT40X

Information - Help 
ID = 57817
       
Country:
Great Britain (UK)
Brand: Marconi Scientific Instrument Co. LTD.,The; London
Developer: MO Valve Co. Ltd.; GB 
Tube type:  Triode, vacuum 
  <1925 very rare. ***
Identical to AT40X

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Transmittertube (Radio)
Filament Vf 7 Volts / Direct
Description

Made for the British Army. Other details unknown.

 
Dimensions (WHD)
incl. pins / tip
52 x 145 x mm / 2.05 x 5.71 x inch
Information source British Radio Valves - The Vintage Years: 1904-1925   Page 126

b4_1~~68.png AT40X: Fin Stewart
Fin Stewart


Just Qvigstad
 
at.40x.jpg

 

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