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RARE MUSEUM PIECE 1920'S GEC AT40 RADIO VALVE

£995.00
£995.00
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RARE MUSEUM PIECE 1920'S  GEC AT40 RADIO VALVE Boxed vintage collectors item

ube type:  Transmitting Triode, air cooled   Power/Output 
  <1925 very rare. ***

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: 1904-1925 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