Seeing as you have "super sensitive KHorns", you might consider the Art Audio Carissa. 16 watts but single ended, a little more magic in the midrange. If you need 50 watts, I'd say the Quartets would be an excellent choice. I used them occasionally with my Maggies.
Tube 'Characteristics' - EL-34 and 845 and 211
At the risk of getting slammed by those that think all tubes should sound the same in a properly designed circuit, I was wondering if anyone can comment on their experiences and the differences they have heard between the EL-34 tubes and the 845's and 211's. I've used the EL-34 for many years but have been advised that I should seek out a good 845 mono block to use with my super sensitive KHorns. Is the 845 more powerful sounding? Does it have or can it match the natural 'beauty' inherent to the EL-34?