When I hooked up my newly aquired Sabine tuner to my amp, I started to get a radio signal coming through my cab. It only happens when I am running my guitar into my tuner, and then connect the tuner's amp out to the insturment input on my amp. Could this be caused from not using shielded cables? I don't know if one of them is shielded or not, because it is just some random small cable that was left at a show that I picked up. Any ideas as to what I can do to get rid of this are welcome. Thanks and God bless.