I use an Astatic Silver Eagle that I modified for a better tone and proper impedance matched for my Icom 718 . . . . I really love it. I recently bought a Silver K Eagle at a ham fest for my wife’s radio. When I opened it I discovered a vastly different circuit. I know that it was full of CB sound effects which I have disabled. My problem is that I cannot find a schematic for its pre amp circuit. Does anyone have a schematic or modification for this mic?