The Symetrix unit could be involved. Why are you using it? What mic are you using? 73, Jim K9YC On 2/2/2019 10:55 AM, mustang65 wrote: > I am thinking of putting the outputsignal from the symetrix 528e microphone > amplifier > to c20 on the ksb2 board so I will bypass U3 and let the signal go direct > to u5 NE602