Not sure..
But what about Rotel?? Since they seem to be brand mates. I thought I would think of them. Unless of course it has to be Tubes??
If it has to be Tubes I would go with the Butler suggestion that "Rlwainwright" has made to have a starting point.
If it has to be an All Tube System, and I have a Speaker System like the B&W 805 Standmounter, and the Electronics cannot exceed $5000.00, then I would look at Rogue Audio and check out the Metis Magnum Preamplifier (which is an All-Tube design) and then mate it with the matching Atlas Magnum Power Amplifier.
On the other hand, for me, I would do the Rogue Audio Metis Magnum Preamplifier and then mate it to a Rotel RB-1552 Power Amplifier. That would give me an All-Tube Preamplifier with a Solid-State Power Amplifier. And then, I would design the rest of my system accordingly with other components that would bring out the best in these two main components. I would look at this as the best of both worlds. And this combination will still leave you with plenty of cash for other components or upgrades for your system.
--Charles--