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ID = 57203
United States of America (USA)
Brand: Sparton-Cardon Tubes; Jackson MI
Developer: Westinghouse El. & Mfg. Co. - see also Canadian W. 
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
  Ca. 1925 up to 1945 rare.
Identical to C-281 = 81 = CX381 = 181 = 281 = 481 = UX281

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
Dimensions (WHD)
incl. pins / tip
x 139 x 60 mm / x 5.47 x 2.36 inch
Weight 47 g / 1.66 oz
Information source - - Manufacturers Literature   
C-281: Worthpoint photo
Fin Stewart

C-281: ARRL Handbook 1972
Michael Schlör

C-281: own collection
Peter den Boer

from Just Qvigstad

Usage in Models 4= 1930 ; 4= 1931

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):8

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