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ID = 77902
Brand: Canadian General Electric (Canada) (C.G.E. or CGE); Toronto, ON
Developer: Research Enterprises Ltd., Toronto 
Tube type:  Vacuum Pentode   RF/IF-Stage 
Identical to 6AJ7/6AC7 = 6AJ7
Similar Tubes
Normally replaceable-slightly different:
  6AC7 ; CV849
First Source (s)
25.Jan.1944 : Electron Tube Registration List 360

Base Octal (Int.Octal, IO) K8A, USA 1935
Was used by Radar
Filament Vf 6.3 Volts / If 0.45 Ampere / Indirect / Specified voltage AC/DC

6AJ7 was an improved variant of industry standard 6AC7 intended for applications in radar receivers as IF or video amplifier. Tighter control of the cutoff voltage, compared to its 6AC7 prototype, and bare metal ring over the base, in order to ground the metal skirt when inserted in a special socket with side fingers.

It was registered to Canadian REL during the war, in January 1944. Being very similar to its prototype, REL also requested the double marking permission, 6AJ7 / 6AC7 for this tube.

Low-loss micanol base.

Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   

Just Qvigstad

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