Antique radios, Old Time Radios
R4B_BTH
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Country:
Great Britain (UK)
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Brand:
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| Tube type: |
Triode, vacuum Universal |
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<1925 very rare. *** |
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| Identical to |
R4B_BTH
= R4B_MO
= R4B_Marconi
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| First year |
1922
Saga of the Vacuum Tube, Tyne page 220
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| Predecessor Tubes |
R4A
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| Base |
Europe 4-Pin B4 (Eu A, E, 4A) 1914
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| Was used by |
Military and/or Government |
| Filament |
Vf 3.5 Volts / If 0.46 Ampere / Direct |
| Description |
The R4B tube was first made in 1918 and had an E12 base. In the following years, this was changed to B4 but date of the changeover is uncertain.
Text in other
languages (may
differ)
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| Information source |
British Radio Valves - The Vintage Years: 1904-1925 pages 27 & 40
Saga of the Vacuum Tube, Tyne Page220
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R4B_BTH: Fin Stewart
Fin Stewart
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Just Qvigstad
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