Antique radios, Old Time Radios
257
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Country:
United States of America (USA)
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| Identical to |
257
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| Similar
Tubes |
Normally replaceable-slightly different:
GA
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| Base |
UY-Base, 5 Pins (USA, April 1927) (Codex=Kf)
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 5 Volts / If 0.3 Ampere / Indirect / Specified voltage AC/DC |
| Description |
Developed by Tung-Sol as a DC power amplifier. This tube was used in the Fada models 171 and 173. These receivers were operating on 110 volts DC. the supressor grid is wired to the center of the filament. Tube as originally designed by National Union.
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Dimensions (WHD)
incl. pins / tip |
x 137 x 54 mm / x 5.39 x 2.13 inch |
| Weight |
59 g / 2.08 oz |
| Information source |
Taschenbuch zum Röhren-Codex 1948/49
Tube Lore (II) Page 31
-- Collector info (Sammler)
Röhrencodex , Röhren-Taschenbuch 1950 23000 Röhren
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| Tube Tester Data |
Avo CT160 |
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257: Telefunken Werkstattbuch
Wolfgang Bauer
More ...
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Just Qvigstad
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):12
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