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ID = 19992
United States of America (USA)
Brand: Westinghouse for Brand RCA-Radiotron
Developer: Westinghouse El. & Mfg. Co. - see also Canadian W. 
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to WR21 = WR21A
Similar Tubes
Other characteristic (electr. data):
Differences not known by us:
First year Feb.1922 Radio Manufacturers of the 1920's, Vol. 3 page 9
First Source (s)
1920 : Antique Radio Classified L.A.Peckham, 1991
1922 : Saga of the Vacuum Tube, Tyne page 310+312
Production stop Sep.1922

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.8 Ampere / Direct / Battery =

Aeriotron WR21. Initially for the Westinghouse DR (1921), later for the Aeriola Grand receiver of July 1922. The only known Radiola Grand can be seen in the Ford Museum (Douglas). The manufacturing of this tube was discontinued already in September 1922. Needs a ballast tube WB800. Two versions existed: The WR21A (for Amplifier) clear glass tip, and the WR21D (for Detector) with green lacquer tip.
This tube is fitted with a base made by the Shaw Insulator Company and was surplus stock acquired when the Westinghouse company bought the Moorhead inventory in 1920

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Tube prices 6 Tube prices (visible for members only)
Information source -- Collector info (Sammler)   

b4_1~~75.png WR21: Fin Stewart
Fin Stewart

Just Qvigstad
Usage in Models 1= 1922

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

Collection of



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