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ID = 28401
Great Britain (UK)
Tube type:  Transmitting Triode, air cooled   Power/Output 
  <1925 very rare. ***
Identical to AT40
Similar Tubes
Other base and data slightly different:
  AT40_UV ; VT15_GPO
First year 1922 Saga of the Vacuum Tube, Tyne Seite 381
First Source (s)
1921 : British Radio Valves - The Vintage Years, Thrower p.77

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Military and/or Government
Filament Vf 7 Volts / If 1.5 Ampere / Direct
Description Made for the British Army by MOV. Also made by A.C.Cossor Ltd - tube in collection has American UV 4 pin base. 
Dimensions (WHD)
incl. pins / tip
60 x 125 x mm / 2.36 x 4.92 x inch
Information source British Radio Valves - The Vintage Years, Thrower   Pages 77 & 83
- - Data from my own collection   
John Koster

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