It's no secret that I consider Alan Kimmel, currently working with Grommes to design the rebirth of their hi-fi heritage, to be the greatest designer of tube amps currently working. His PHI-26 is the best sounding amp I have ever heard.

I am posting the link to his informal paper on MU Stage design for anyone interested in tube or MOS-FET amp topology. I can tell you that his execution of these ideas has made me a believer, and what I most believe in is what works the best.
http://www7.taosnet.com/f10/mustage.html

The typing is a little rough in places, but the paper is easy to understand if you have studied tube characteristics informally. You might want to save this rather than just bookmark it if you have any interest. This has been a hard to find paper in the past.

Clark in Peoria