Antique radios, Old Time Radios
R4A
| Base |
Edison (candelabra) 12 mm
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| Was used by |
Military and/or Government |
| Filament |
Vf 2.5 Volts / If 0.46 Ampere / Direct / Battery = |
| Description |
Thrower states a filament current of 0.65 A. Tyne says 0.46 A. The early BTH R4 tube had a spherical bulb and was first made in 1916.
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| Information source |
Saga of the Vacuum Tube, Tyne Pages 219 & 220
British Radio Valves - The Vintage Years: 1904-1925 Pages 26,27,40 & 86
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