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
I replaced a 10 or 15 foot piece of rg8m with a 20 foot
radio shack regular audio cable.
This went between the berringer on the desk, to the nikko power amp
in the rack (now empty and out of the way).
The rack will hold the homebrew pair of 4d32 rig in the future.
The level was the same except
I use an outboard audio amp for my 75A-4 receiver with a system of adaptors
that requires no modification to the receiver itself. I pull audio
directly from the grid pin of the 12AT7 1st audio stage (with the tube
removed). This is a high impedance point, 470k if I recall correctly. To
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