Does anyone have, for sale one (or 2) of the inline mike preamps for the earlier ICOM transcievers. I have 2 775's and my new Heil doesn't have enough OOOMPH. Or a schematic would be good. I am using a sm-5 with the Heil HC-5 element and it works great, just want to upgrade the look. Thanks 73 Woody K4EER and K4EBK on the beautiful Indian River Lagoon