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ID = 27338
United States of America (USA)
Brand: Westinghouse El. & Mfg. Co. - see also Canadian W.
Developer: Westinghouse El. & Mfg. Co. - see also Canadian W. 
Tube type:  Gas Triode   Detector 
  <1925 very rare. ***
Identical to WR21D
Similar Tubes
Normally replaceable-slightly different:
Other characteristic (electr. data):
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 =

Aeriola WR21D. For audion stage. Green lacquer tip.
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.
This tube is fitted with a base made by the Shaw Insulator Company and was surplus stock acquired by the Westinghouse Company when they bought the Moorhead laboratories inventory in 1920.

Text in other languages (may differ)

b4_1~~77.png WR21D: Fin Stewart
Fin Stewart

Just Qvigstad
Usage in Models 2= 1921

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

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