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ID = 20110
United States of America (USA)
Developer: Westinghouse El. & Mfg. Co. - see also Canadian W. 
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
Identical to R81_USA = G81 = UX281 = CX381 = AC81
Similar Tubes
Normally replaceable-slightly different:
  281 ; 81
First Source (s)
1928 : Saga of the Vacuum Tube, Tyne p.344

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 7.5 Volts / If 1.25 Ampere / Direct / Parallel, (AC/DC)
Description Tube also made by the National Radio Tube co of San Francisco. 
Dimensions (WHD)
incl. pins / tip
x 133 x 62 mm / x 5.24 x 2.44 inch
R81_USA: Bill Condon collection with permission from Mrs V Condon
Fin Stewart

R81_USA: ARRL Handbook 1972
Michael Schlör


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