why the distorted sound?

I recently moved my system, and when I plugged it all back in, I seem to have a very distorted hiss and crackle over the music on both channels. The distortion increases with volume. I'm running an old pair of Manley monoblocks driven by a Cary slp-98. I switched my pre-amp tubes around, but it sounds exactly the same no matter what. I wouldn't think it was the amps because for both to fail in exactly the same way sounds dubious. I have moved my wires around as well, but to no avail. I am far from experienced with tubes so any suggestions would be highly appreciated. BTW, I live on a small island without any repair facility even close.