Radios antiguas y Radios de Colección
WR21A
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País:
Estados Unidos
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| Idéntica a |
WR21A
= WR21
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| Válvulas similares |
Substituya normalmente -diferencia peq.:
WR21D
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| Fuente principal
(es) |
1920 : Antique Radio Classified L.A.Peckham, 1991
1922 : Saga of the Vacuum Tube, Tyne page 310+312
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| Fin producción |
Sep.1922 |
| Base |
Europe 4-Pin B4 (Eu A, E, 4A) 1914
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| Usada en |
Radio/TV-reception etc. |
| Filamento |
Vf 4 Volt / If 0.8 Ampere / Direct / Battery = |
| Descripción |
Aeriola WR21A. 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 when the Westinghouse company bought Moorhead Laboratories inventory in 1920
Texto en otros idiomas
puede diferir
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WR21A: Fin Stewart
Fin Stewart
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Just Qvigstad
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Número de
modelos en Radiomuseum.org con esta
válvula:2
Colección personal de
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