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Information - Help 
ID = 40932
Brand: Rogers-Majestic, Standard Radio Manufacturing, Rogers Radio Tubes; Toronto
Tube type:  Triode-Pentode   Audio Frequency 
Identical to 6H7M
Similar Tubes
Other base:
Multiple differences or of other kind:

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament Vf 6.3 Volts / If 0.55 Ampere / Indirect / Specified voltage AC/DC

Output section similar to type 41, 6AD7, 6F6 or 6K6.

Although this can offer a possible substitution for the 6AD7 as the output Pentodes are almost identical, the triodes differ considerably and would usually require circuit changes to operate. The biassing, impedances and gains are significantly differerent. The 6AD7 heater at 0.85A is also different from the 0.45 to 0.55A range quoted for the 6H7M and 6H7S tubes.

This note is added as a guide to possible substitution of these rather scarce items.


6H7M: Rogers 10- 65
Jacob Roschy

Just Qvigstad
6H7M: own collection
Peter den Boer

Usage in Models 11= 1935

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):11

Collection of



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