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1231

Information - Help 
ID = 9702
       
Country:
United States of America (USA)
Brand: Sylvania (Hygrade, GTE, Nilco); Emporium (PA)
Developer:  
Tube type:  Vacuum Pentode   RF/IF-Stage 
Identical to 1231 = 7V7
First Source (s)
May.1938 : Tube Lore (I)
Successor Tubes 7V7  

Base Loctal-8, B8G (Sylvania, 1938) (Codex=W)
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. 
Tube prices 1 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   
Tube Lore (I)   

7v7~~1.png
1231: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Anonymous 10 Collector

358_8~~1.png 1231: Telefunken Werkstattbuch
Wolfgang Bauer

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