First, let me thank Rob (Riglehart) and Ted (RT1) for letting me borrow their custom made AI-1 interconnect cables.
This simple test involved three AI-1 isolation transformer cables. One Polk factory issue, one Stancor P-6012 and one Avel-Lindberg Y236605. I used the first track, Babylon Sisters, from Steely Dan-Gaucho on SACD because of the excellent sonics and I know the song very well. I was able to swap cables in about 15-20 seconds and did this repeatedly over a few weeks.
Ok, the meat....
I found little difference between the stock transformer and the Avel. Both had a nice, wide and proper soundstage, detail, air, tone and decay. However, the Avel was a little more forward and slighty less euphoric because of it. I have to wonder if an Avel transformer of the exact same spec as the factory transformer would fix that? I think it would. The Stancor, while not sounding poorly, just didn't have the soundstage, air, detail or decay of the others. This was evident every time and I can't recommend it.
Thanks again guys, I had fun.