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WR21

Information - Help 
ID = 19992
       
Country:
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):
  WR21D
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 Vacuumtube, Tyne page 310+312
Production stop Sep.1922

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

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

 
Text in other languages (may differ)
Tube prices 4 Tube prices (visible for members only)
Literature -- Collector info (Sammler)   
 
wr21.jpg
WR21: ME
Marco Elsen

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

 

Usage in Models 1= 1922

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


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