Holy Grail part II
Or there's the recent re-release of the London (Ontario) Power Studio. This is pretty sweet, and built a short drive away. So it should be affordable, right?
Its a rackmount all tube head with proprietary Power Scaling, presumably better than master volume or attenuator for reducing volume and keeping tone. But what's really cool is that nearly every major design decision an amp builder might make is tweakable. Cathode bias? Flip a switch. How much negative feedback? Twist a dial. Tubes? Take your pick. These are the things that give different amps their character and you get to modify the tone with these choices not just the limited pallete of any one amp design.
But as you might have guessed, it don't come cheap.