Antique radios, Old Time Radios
GR420
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Country:
Germany
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| Identical to |
GR420
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| Similar
Tubes |
Other base:
GR420/A
Multiple differences or of other kind:
GR420/DA
; GR420/DR
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| Base |
Europe 4-Pin B4 (Eu A, E, 4A) 1914
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| Was used by |
Technology / Measurement |
| Filament |
--/-- |
| Information source |
Universal Vade-Mecum, Electron Valves and Semiconductor Devices group 494
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Just Qvigstad
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