Antique radios, Old Time Radios
SP50B
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Country:
Great Britain (UK)
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| Identical to |
SP50B
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| First Source
(s) |
Sep.1927 : Wireless World (The), London (WW, 79)
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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 6 Volts / Direct / Battery = |
| Description |
The SP50B (or Blue coded)is one of the "shortpath" tubes developed by Metropoliton-Vickers branded Cosmos.
The SP50R (or Red coded)is of similar construction and used as a power AF amplifier.
Story of Cosmos valves see here
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| Information source |
History of the British Radio Valve to 1940 p.161
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SP50B: Fin Stewart
Fin Stewart
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Just Qvigstad
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| Data Compliance |
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