Antique radios, Old Time Radios
GR25-4
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Country:
Germany
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| Identical to |
GR25-4
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| Similar
Tubes |
Normally replaceable-slightly different:
GR28-40
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| Filament |
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| Information source |
Universal Vade-Mecum, Electron Valves and Semiconductor Devices group 486
Röhren Taschenbuch, Bd. II, Leipzig
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