I got a reaaaaly nice clean sound yesterday at work. I used my AVRI through my Ampeg Reverberocket.
The amp was elevated on a piano bench, in a live room.
I had an Audio Technica 4060 (large diaphragm tube condensor) right up to the grill, where the center meets the speaker cone.
Then I had an AKG c414 in cardioid, off axis, about 3 inches back. It was kind of off axis vertically, tilted back towards the ceiling at about 30 degrees.
Then I had a Royer R122 (ribbon mic) about 2.5 feet back.
There were Gobos around my amp because it was a live recording.
We also used a mid/side technique on my other guitarists amp. We had an SM57 on axis, and another 414, in figure 8 totally off axis. we split the sigal of the 414 and flipped the phase on one of them and panned them hard left and right to get that mid/side effect.
You can hear a rough mix of the song on a myspace I have. listen to the one called "second band practice." Mine is the clean, his is the distorted (he uses a strat)
http://www.myspace.com/thelateoysterboy