Antique radios, Old Time Radios
1231
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Country:
United States of America (USA)
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| Identical to |
1231
= 7V7
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| First Source
(s) |
May.1938 : Tube Lore (I)
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Successor Tubes
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7V7
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| Base |
Loctal-8, B8G (Sylvania, 1938) (Codex=W)
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 6.3 Volts / If 0.45 Ampere / Indirect / Specified voltage AC/DC |
| Description |
Power/video amplifier, sharp-cutoff pentode. Gm 5.8mSm, 4W.
Actually it has four grids, G2 and G3 being parallel connected as screen.
1231 was the Sylvania proprietary code for this first loktal tube introduced in May 1938.
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| Tube prices |
1 Tube prices (visible for members
only)
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| Information source |
Taschenbuch zum Röhren-Codex 1948/49
Tube Lore (I)
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1231: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Anonymous 10 Collector
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1231: Telefunken Werkstattbuch
Wolfgang Bauer
More ...
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Just Qvigstad
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1231: My schematic collection.
Pier Antonio Aluffi
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