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Information - Help 
ID = 32305
Brand: Rogers-Majestic, Standard Radio Manufacturing, Rogers Radio Tubes; Toronto
Tube type:  Double Diode-Pentode   RF/IF-Stage   Controlling (mu) 
Identical to 6B7M
Similar Tubes
Different connections:

Base Octal (Int.Octal, IO) K8A, USA 1935 Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC
Dimensions (WHD)
incl. pins / tip
x x 38 mm / x x 1.50 inch
Information source Taschenbuch zum Röhren-Codex 1948/49   

Just Qvigstad
6B7M: own collection
Peter den Boer

Usage in Models 1= 1934 ; 20= 1935 ; 2= 1941?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):23

Collection of



Forum contributions about this tube
Threads: 1 | Posts: 3
Hits: 3461     Replies: 2
6B7M (6B7M)
John Albion

The rogers 6B7M is a 8 pin octal (K8A) based tube, all Rogers "M series" tubes are a K8A base even if the original designation type such as the 6B7 was not. See Rogers tube data sheet on our web site; (item URL below).

thank you,

John Albion

Emilio Ciardiello

Dear John,

according to Sibley, some of the Rogers ‘M’ types were standard existing tubes rebased as alternate solution to the new RCA metal tubes. It is interesting to read that the sprayed conductive layer over the glass bulbs was covered with black paint to better resemble the look of the metal tubes.

Here is the complete list from ‘Tube Lore’, Supplement 3, of ‘M’ tubes, all with octal base as the 6F7M:


John Albion

Hello Emilio,


Thank you, great information to help with some of the confusion with the Rogers "M series" tubes. What was not mentioned there is Rogers also produced the same "M series" tubes with different size grid caps which added more to the confusion. I have just up loaded two pictures of the Rogers 6K7M, one with a miniature grid cap and the other with a small grid cap.


thank you again,



End of forum contributions about this tube

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