I need help on this one

Okay, Most of the time I am very good at troubleshooting problems but, this one has me stumped. I have been using a Graham Slee Era Gold mkV with no problems for a few months now. I think this has been an outstanding unit.
Now here is the problem. In the last few months I have been through 3 different preamps. First a Rogue Magnum 99. No problem, everything sounded great. Sold the Rogue and bought a Blue Circle BC3. The Era Gold still worked fine but I didn't like the BC3 at all for my musical taste.
I got tired of dicking around and figured I wouldn't spend much time at home this summer and bought a AES/Cary AE-1 to hold me over until the fall season.
Now with the AES there is a very pronounced ssshhh through the AES when I select the channel for LP.
I have tried switching cables, I tried switching inputs. I tried a different elec. outlet for the Era Gold. Nothing I do gets rid of the ssshhh. It is noticeable at a volume setting of about 10 o'clock. Any ideas that I can try?
I have even tried grounding the Era Gold. I am wondering if there is some sort of incompatibility or something with the AES.