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ID = 4567
Brand: Canadian Westinghouse, Hamilton
Developer: Research Enterprises Ltd., Toronto 
Tube type:  Vacuum Pentode   Text 
Identical to 6AK7 = 6AK7/6AG7
Similar Tubes
Normally replaceable-slightly different:
  6AG7 ; CV1784
Other base and data slightly different:
  6197 ; 6677

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Ukp)
Was used by Radar
Filament Vf 6.3 Volts / If 0.65 Ampere / Indirect / Specified voltage AC/DC

6AK7 was an improved variant of industry standard 6AG7 intended for applications in radar receivers as video amplifier. Increased transconductance and anode current raised to 20 mA, compared to its 6AG7 prototype. Bare metal ring over the base, in order to ground the metal skirt when inserted in a special socket with side fingers.

RMA registered 6AK7 to Canadian REL during the war, in January 1944. Being very similar to its prototype, REL also requested the double marking permission, 6AK7 / 6AG7 for this tube, which actually carries the dual marking.

Canadian Westinghouse known manufacturer for the double marked 6AK7/6AG7. The RMA 6AK7 was also listed by other US manufacturers, among which General Electric and Sylvania.

Low-loss micanol base.

Tube prices 2 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
Electron Tube Registration List
Emilio Ciardiello

More ...
6AK7: elektron taschenbuch 1952
Heinz Höger

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