Intractable Problem

I am having a problem and hoping that I might get some useful advice here. Thank you in advance to anyone that might offer helpful suggestions.
My two channel system is not playing equally out of both channels. Specifically, one channel plays probably at 5% the volume of the other.
My preamp is an Ayre K-5xe. My power amp is Parasound 2250. Speakers are
B&W 803-D. Interconnects are Nordost Blue Heaven. There are two digital sources--Oppo 105 and a Denon "Anniversary Edition" SACD/CD Player. TT is Clearaudio Concept from a Music First Phone Preamp.
The problem occurs with all of the sources. I took both the Ayre and the Parasound to their respective dealers and they checked out fine. Changing the interconnects doesn't help.
I put in an old Pioneer Elite receiver and left the speaker wire arrangement (it was tacked into walls by an installer and has worked fine for a year) unchanged. The receiver plays equally out of both channels and all the sources work well with it. This would seem to eliminate the speaker wire/connections as being at fault.
The Parasound dealer loaned me another amp. It immediately blew two fuses when I put it in the system with the Ayre. I think this may be due to the fact that I was using bare wire at the amp connection, and with all the switching in an out of different pieces of gear, I had let some loose ends of wire be exposed. After this happened I bought some Tributary plugs and have carefully trimmed the wire down. When the Parasound was returned it didn't short, at least, but I'm still only getting 1 channel out of the system.
I am pretty frustrated--it's been 3 straight weekends of messing with this, trips to different dealers, etc....and I'm starting to see the wisdom of Integrated Amps or receivers vs. separates. I'm thinking of trading in the pre and power amps and using the $ for an Integrated and be done with it.
Any suggestions appreciated.