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ID = 30795
Brand: Annaka Electric Co.; - from 1931 called Anritsu.
Tube type:  Gas Triode   Detector 
  <1925 no serial production. For instance only development samples. *****
Identical to Annaka-AAB-5 = AAB-5
First Source (s)
1920 : Saga of the Vacuum Tube, Tyne p.277

Base Wires Wires only.
Was used by Radio/TV-reception etc.
Filament Direct / Battery =
Description Very early Japanese tube probably patterned after the AudioTron. Fil.volts 4. Low B voltage of max 30 V points to a soft valve. Double filament. Believed to have been made pre 1921. 
Dimensions (WHD)
incl. pins / tip
80 x x 28 mm / 3.15 x x 1.10 inch
Weight 22 g / 0.78 oz
Information source Saga of the Vacuum Tube, Tyne   Pages 277 & 278 + 467

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