Antique radios, Old Time Radios
R2A
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Country:
Great Britain (UK)
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| Identical to |
R2A
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| Similar
Tubes |
Normally replaceable-slightly different:
R2_England
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| First year |
1918
??
Saga of the Vacuum Tube, Tyne page 216
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| First Source
(s) |
Sep.1917 : British Radio Valves - The Vintage Years: 1904-1925 p.25
Sep.1917 : Saga of the Vacuum Tube, Tyne
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| Predecessor Tubes |
R2_England
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| Base |
Europe 4-Pin B4 (Eu A, E, 4A) 1914
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 3.3 Volts / If 1.1 Ampere / Direct / Battery = |
| Description |
Soft valve of similar construction as the French TM. Filled with Helium at a pressure of 0.6 mm Mercury. Thrower quotes 1.2 Amp at 3.5 Volts.
Exhibited by MOV at Physical Society display in London in January1920. Booklet for this display shows the anode voltage range quoted was 25 to 40 volts. on pages 4 & 7
The tube was mostly made with E12 (CES) base but the B4 base was optional. The tube was used by the British Navy in the last year of World War One.
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| Information source |
- - Manufacturers Literature Booklet "Exhibit of Wireless valves - Marconi Osr
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Just Qvigstad
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Collection of
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| Data Compliance |
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