Antique radios, Old Time Radios
SP50R
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Country:
Great Britain (UK)
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| Identical to |
SP50R
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| Similar
Tubes |
Normally replaceable-slightly different:
B605
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| First Source
(s) |
Sep.1927 : Wireless World (The), London (WW, 79)
Aug.1930 : Philips Bulletin R1164, P.14
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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 / If 0.25 Ampere / Direct / Battery = |
| Description |
The SP50R (or Red coded) is one of the "shortpath" tubes developed by Metropoliton-Vickers branded Cosmos.
The SP50B (or Blue coded)is of similar construction and used as an AF amplifier.
Story of Cosmos valves see here
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| Information source |
70 Years of Radiotubes and V. p.196
History of the British Radio Valve to 1940 p.161
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SP50R: Fin Stewart
Fin Stewart
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Just Qvigstad
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Collection of
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