[Elecraft] RFI wiht my KX3

[John Pierce]

I am trying to use a dynamic mic with my KX3 and have RFI on my output.  I
am using the KX3 as a driver to a KM3KM amplifier looking to get about 400
to 500 watts output.  I have a small pre-amp between the mike and the KX3.
I have modified the pre-amp to ground the lines from and two the pre-amp at
the XLR input/outputs.  What frustrates me the most is that I do not have an
oscilloscope to diagnose the problem.  I have tried using toroid on all
lines, including power lines without any success.

 

Is it possible to accomplish what I am trying to do?

 

John, AD2F