I have a Musical Reference RM 10 that is so unique in that it extract such good drive from the little el84 tube. No other amp I know of gets 35w from 2 of these little guys. Plus this little guy is easy to bias and tube rolling is fun. I think the el84 is my all time favorite power tube especially since I can get 35w and drive just about any reasonable speaker. This amp and my Logitech Navigator are pretty much off the market permanently. And that is a rare statement for me if you look at my transaction activity on A'gon