Antique radios, Old Time Radios
SP4_Triotron
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Country:
Austria
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| Identical to |
SP4_Triotron
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| Similar
Tubes |
Normally replaceable-slightly different:
B405
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| Base |
Europe 4-Pin B4 (Eu A, E, 4A) 1914
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| Filament |
Vf 4 Volts / If 0.15 Ampere |
| Information source |
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SP4_Triotron: rtt
Anonymous 10 Collector
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Just Qvigstad
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