..
I've been watching this thread for some time and what is said below is just
busslit. No native electret mic that was ever made was 50 ohms, nor are
aircraft microphones 50 ohms nor are thelphone electret mikes 1k. You are
blowing smoke.

BTW, having been in the aircraft headset business for twenty years and
change, I can tell you that when a clown like this comes on asking where to
get a "replacement mic" without telling you the manufacturer and model of
the headset, he is trolling for ANY microphone that he can use to convert a
Harbor Freight type headset to aircraft use on the cheap.

Jim



Some telephone electret mics are 1000 ohms and civilian headset electret
mics are typically 50 ohms. That's not to say there aren't telephone
electret mics that are also 50 ohms, but I suspect most are higher.