This is the instruction sheet and schematic for one channel that I received from Audio Research. I discovered 5 N-Channel MOSFET transistors per channel, not in the audio signal path, but used for voltage regulation. There are a couple of differential triode gain stages followed by cathode followers driving parallel push-pull power tubes.

CLICK HERE FOR BIGGER SCHEMATIC IMAGE
The fax'ed schematic isn't perfect but useable.  If you need a copy for yourself, contact Audio Research.  There's a bigger image of the schematic available here by clicking the link above.  Only one channel is shown as both channels are identical for replacing and adjusting voltages to the tubes.  Click photo to move to next page.
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