Antique radios, Old Time Radios
407B
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Country:
United States of America (USA)
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| Identical to |
407B
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| Similar
Tubes |
Different maximum ratings:
407A
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| Base |
Noval, 9 pin miniature (USA pico-9) B9A
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| Filament |
Vf 40 Volts / If 0.05 Ampere / Indirect |
| Description |
Miniature twin triode, for use in carrier repeater equipment having heaters and plate series supplied through cable pairs. Heater can be connected for 20V, 100mA operation. 'B' was uprated to 1.6W, 130V cathode to heater and 6.0mS Gm.
WE known manufacturer.
Text in other
languages (may
differ)
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| Information source |
Tube Lore (I)
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407B: Ratheiser
Anonymous 10 Collector
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Just Qvigstad
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