Have you tried Mesa? They're usually pretty good about schematics for their older products. I remember the Baron - when Mesa tried to appeal to the hi fi market for a bit. Sure looked good.
If you can't get a schematic (and Mesa schematics aren't always the most reliable anyway), I would look at the Strategy 400 schematic. Stereo with each side having 6x6L6 and a driver and PI tube. The Baron looks similar.
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