-> I know the input isn't stereo,  but the mic I have here (which works) uses a
-> stereo-type plug.  Maybe they're running power to it on that extra connection, 
-> or something,  I don't know for sure.  That's why I posted about it in the
-> first place.

 OK. IF the mike dosne't have an Internal Battery. The early electret
Mikes did have a button battery inside,. The Ring connection could be
for mike power from the Preamp. 
For Handheld Ham radios it is for the Push to Talk switch.
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