[ARC5] Microphone XFMR?

[J. Forster]

Brad Hernlem wrote:

> Anyone recognize this transformer?:
>
> http://home.att.net/~b.hernlem/OZRlike.html
>
> It was suggested that this might be WWII era microphone input transformer.
> Respondant thought ARC-5, possibly, although I doubted it. However, if it is
> mil, maybe someone here recognizes it.

The package looks like ARC-5 capacitors, but you knew that.

> "M" to "A" is 7 ohms DC res. "G" to "G" is 1.7 kohm and "C" is midway. Maybe
> a carbon mic to P-P grids input transformer but what do those terminal
> designations mean? Guess and suggestions have included "mic" for "M", "grid"
> for "G" (those are the easy guesses) and "A" and "C" bias rails for the
> respective terminals. "C" could also mean "center-tap" or "common" but it
> does not go to case.

G is clearly 'Grid'
C is likely 'Center' or 'Common'.  There is no reason it should be grounded. It
might be designed to go to some bias network.
At a guess M is mike and A is the A supply (possibly through a dropping
resistor)

FWIW,
-John