Antique radios, Old Time Radios
WR21
 |
| Identical to |
WR21 = WR21A
|
| Similar
Tubes |
Other characteristic (electr. data):
WR21D
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| First year |
Feb.1922 Radio Manufacturers of the 1920s, Vol 3, Alan Douglas page 9 |
| First Source
(s) |
1920 : Antique Radio Classified USA 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)
|
| 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.
Text in other
languages (may
differ)
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WR21: ME
Marco Elsen
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| Usage in Models |
1= 1922 |
| Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 1 |
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