Antique radios, Old Time Radios
R4_Osram
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Country:
Great Britain (UK)
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| Identical to |
R4_Osram
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| Similar
Tubes |
Normally replaceable-slightly different:
R4_BTH
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Successor Tubes
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R4A
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| Base |
Edison (candelabra) 12 mm
Wires only.
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| Was used by |
Military and/or Government |
| Filament |
Vf 3.3 Volts / If 1 Ampere / Direct / Battery = |
| Description |
Developed from the R Type. The R4 was a hard vacuum tube. The Naval version is the NR4. First made by Osram GEC June 1917. This tube led to the development of the R4A, R4B and R4C types
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Dimensions (WHD)
incl. pins / tip |
50 x 86 x mm / 1.97 x 3.39 x inch |
| Weight |
32 g / 1.13 oz |
| Information source |
British Radio Valves - The Vintage Years: 1904-1925 Pages 26, 27, 40 & 86
Saga of the Vacuum Tube, Tyne Pages 220 & 221
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Collection of
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