Radio Antica e Radio d'epoca
257A
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Stato:
USA (Stati Uniti d'America)
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| Identico a |
257A
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| Valvole
simili |
Altra base:
231D
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| Zoccolo |
UX-Base (4 Pins (2 thick, USA 1924)
Top contact with a cap.
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| Filamento |
Vf 3 Volt / If 0.06 Ampere / Direct / Battery = |
| Descrizione |
Receiving triode, T8 bulb on four pin base plus grid cap. Mu = 8.5, Gm 0.38 to 0.56mS. 4000 hours life expectancy; controlled microphonics. Grid and filament spring supported by glass bead from top of plate. Developed for Northern Electric as variant of 231D.
Not to be confused with HK-257A/4E27 or with other transmitting tubes.
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| Bibliografia |
Tube Lore (I)
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| Tube Tester Data |
Avo CT160 |
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257A: From my schematic collection.
Pier Antonio Aluffi
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Just Qvigstad
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257A: Manufacturer's Literature
Emilio Ciardiello
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| Conformità dei dati |
Ulteriori informazioni |
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