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ID = 73995
Great Britain (UK)
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
Identical to AU15
Similar Tubes
Normally replaceable-slightly different:
  AU3_E27 ; U3

Base Edison big E27 = 27 mm Top contact with a cap.
Was used by Military and/or Government
Filament Vf 5.5 Volts / If 1.5 Ampere / Direct / Parallel / series AC/DC
Description Half wave rectifier tube made for the British Army. Anode dissipation is 15 watts. The top cap is a B22S single centre contact, with the anode leading wire connected to this. 
Dimensions (WHD)
incl. pins / tip
x 125 x 55 mm / x 4.92 x 2.17 inch
Information source British Radio Valves - The Vintage Years, Thrower   Page 78
AU15: Ebay item January 2017
Fin Stewart


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