Tuner can be heard through other inputs

You could unplug the rca's from the Naim but try this first. Have the muting on and put the dial where there is no station.

OK,
Just figured out that if there is a component plugged into each input either side, then no problem. As a test, If I only hook up a pair of interconnects with no component, then bleedthrough still exsists.

I think JEA48 hit on it by suggesting shorting plugs. That would simulate (to the integrated) a component being plugged in.
Jeffb your theory may be true as well. Naim does grounding is a bit different through DIN.

Problem solved.
Thanks Again

Have you tried running the system with only one source input plugged in to teh amp at a time? That might give you better sound than using shorting plugs.

Well, I just have both inputs "occupied" on either side of tuner.
Evidently the unsed inputs pull in a radio signal.