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ID = 73996
Great Britain (UK)
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
Identical to AU3_E27 = U3
Similar Tubes
Normally replaceable-slightly different:

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 Tube made for the British Army. The top cap is a B22S single contact with the anode connected to the centre contact. Tube not to be confused with the AU3. 
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
AU3_E27: Tube in National Valve Museum
Fin Stewart


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