Antique radios, Old Time Radios
R4_BTH
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Country:
Great Britain (UK)
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| Identical to |
R4_BTH
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| Similar
Tubes |
Normally replaceable-slightly different:
R4_Osram
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Successor Tubes
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R4A
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| Base |
Edison (candelabra) 12 mm
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| Was used by |
Military and/or Government |
| Filament |
Vf 3.5 Volts / If 1.1 Ampere / Direct / Battery = |
| Description |
Improved R type, able to oscillate. Satisfied naval service requirements - naval version NR4. Tube has an E12 for the filament, with wire leads from the top of the tube for plate and grid connections. It had a spherical bulb and was first made early in 1917
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| Information source |
Saga of the Vacuum Tube, Tyne page 219, 220
British Radio Valves - The Vintage Years: 1904-1925 Pages 26, 27, 40 & 86
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Collection of
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