[pjnad]

Just received my new( previously owned) Modwright Swl 9.0 Signature today. Hooked it into my system: using it with a Krell KSA 150 (ss) amp...replacing a ss audio research. Loud hum through both channels...certainly sounded like a ground hum. Spoke to Krell to ascertain that there was no compatibility issues; they assured me that there shouldn't be- which confirms what my research in various forums indicated. They suggested floating a ground using a cheater plug. Didn't help.
Next, spoke to Dan at Modwright, we ran through some troubleshooting, again to no avail. Tried disconnecting the source components, no good. Tightened the ground screws on the iec plug inlet as per Dan's advice, no good either.
Any ideas???
Thanks,
Paul

[kirch]

Man I HATE ground loop problems!!  Just went through a similar event myself.  Took 5 hours of noodling with different possibilities.  Turns out mine was my power center I was using.  Just for kicks, try a real cheap power strip and see if that makes a difference.  Also, have you tried hooking the amp to a different circuit (or plug) than the pre?  Had luck with that in the past as well.  Have patience.  That's my best advice...

[pjnad]

Thanks for the advice Kirch. Yes, the amp is going into the wall while the pre is going into a PS Audio Quintet. Tried reversing them, pre into the wall, amp into the conditioner...no luck.

[kirch]

My problem was a PSAudio Duet. Did you take the quintet totally out?