Antique radios, Old Time Radios
SD4Sp
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Country:
Austria
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| Identical to |
SD4Sp
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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 |
Direct / Battery = |
| Information source |
-- Collector info (Sammler)
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SD4Sp: Eigen
Franz Buchsbaum
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Just Qvigstad
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):2
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