Antique radios, Old Time Radios
399B
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Country:
United States of America (USA)
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| Identical to |
399B
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| Similar
Tubes |
Heater different:
1T4
; 399A
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| Base |
Miniatur-7-Pin-Base B7G, USA 1940
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| Filament |
Vf 1.15 Volts / If 0.65 Ampere / Indirect |
| Description |
Miniature pentode for telephone carrier repeaters. Similar to 1T4 with different heater voltage. Indirect heating version of 399A.
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| Information source |
Tube Lore (I)
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399B
Emilio Ciardiello
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Just Qvigstad
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