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Information - Help 
ID = 40840
Brand: Rogers-Majestic, Standard Radio Manufacturing, Rogers Radio Tubes; Toronto
Tube type:  Triode-Pentode   Universal   Controlling (mu) 
Identical to 6F7M
Similar Tubes
Different connections:
Other base:
  6F7 ; 6F7B
First Source (s)
1935 : -- Schematic

Base Octal (Int.Octal, IO) K8A, USA 1935 Top contact with a cap.
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC
6F7M: GP
George Papaiz

6F7M: own collection
Peter den Boer

from Just Qvigstad

Usage in Models 12= 1935 ; 15= 1936 ; 5= 1937 ; 2= 1938? ; 1= 1938

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):35

Forum contributions about this tube
Threads: 1 | Posts: 2
Hits: 2229     Replies: 1
6F7M (6F7M)
Frank Van de Ven

 All the Rogers tubes with the "M" suffix, have an Octal shell base, with 8 contact pins and 1 dowel locator pin. The Museum informations states 7 pins. The M series are all Metal Spray Shielded with contact to pin 1, which serves to ground the metal shell.

There is also not a direct substitute for this tube/valve. A 6P7G may be used if the socket is rewired.

Please see this PDF file for M series Rogers tubes.




Frank van de Ven



Emilio Ciardiello

Dear Frank,

Many thanks for the information you sent. The tube base type is now changed to octal. If you have even a pinout diagram to load it would be fine.


End of forum contributions about this tube

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