Antique radios, Old Time Radios
WR21D
 |
| Identical to |
WR21D
|
| Similar
Tubes |
Other characteristic (electr. data):
WR21
|
| 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 |
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.
Text in other
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| Usage in Models |
2= 1921 |
| Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 2 |
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