I don't think I will spend much time trouble shooting, since I went to a whole new setup, I am now going balanced between the mike preamp (berringer) and the power amp (symetrix and soon a samson). The old nikko power amp had unbalanced inputs.
I doubt it was rf getting into the audio chain, but its possible. I was quite sure things were much better after just changing the rg8m out, I had put phono ends on it, and had an adaptor (phono to mono 1/4 inch jack) into the berringer. That should have unbalanced the output of the berringer, which is supposed to compensate for the change in level output with some magic circuit. There were (are) no built in bits in the cables, I DID have an T pad (600 ohm I think) to attenuate one input on the nikko. The new amps have level controls for each channel, so I chucked that. I was also driving two inputs with one (berringer) output. I just thought, since BOTH nikko inputs were bypassed with .047uf caps, that is almost a .1!!! The wrong cable types, add on T pads, excessive bypassing, running two inputs off one output, lots of not so great things that can cause problems. Its good that I have cleaned up this mess. Another nice thing with the new amps is that they have headphone outputs, so I can hear the audio feeding the modulators without doing anything with the 8 ohm outputs. Brett N2DTS
