The wiring diagram for the 746 (original, not Pro) shows the mike audio on pins 1 and 7 with the phantom voltage on pin 2. This makes me assume I could use a non-Icom mike without a blocking capacitor as long as I wire it to pins 1/7. I would like to experiment with a non-amplified D-104, Shure SM 57 or 58, and maybe a Turner Plus 2 with the gain turned down. I am requesting feedback from other 746 users who may have also experimented with alternative microphones. FYI. I would probably be keying with VOX if I use the Shures, but could use PTT on the other mikes. Thanks. Rod, K5FRH.