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ID = 12512
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to AC22 = 124 = UY224 = C324 = AC122 = 222AC = 122AC
Similar Tubes
Normally replaceable-slightly different:
  24A ; AC24

Base UY-Base, 5 Pins (USA, April 1927) (Codex=Ha) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 2.5 Volts / If 1.7 Ampere / Indirect / Specified voltage AC/DC

This tube is the forerunner of the UY224 and was made by a few manufacturers such as Arcturus (122AC), Ceco and Eveready Raytheon (AC22), Sonatron, Songbird (made for Montgomery ward) and Sylvania (AC222). These tubes were available for only a few months - April to July 1929, when the type number was discontinued for these.

Information source Taschenbuch zum Röhren-Codex 1948/49   
AC22: R.O.
Rudolf Osterkamp

AC22: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe † 19.8.20


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