Along the same lines that Sibelius has suggested, I'll throw my two cents in. I used AES (Cary) Sixpac amps for a couple years. They are EL34 output tube based and pretty darn good amps. I wanted to try a different amp, more specifically, a SS amp just to see what else was out there. I bought a pair of Odyssey Mono Extremes on Audiogon. I spent several weeks A/B comparing the Odysseys to my Sixpacs and decided to keep the Odysseys. After several months with the Odysseys, they just sounded dry in comparison to my Sixpacs and I longed for what tubes did for me. I ended up selling the Odysseys and buying another pair of Sixpacs. Your mileage may vary, but if you're looking for a different sound, you may be well served trying out some tubes. I didn't study all the advice that you've received above, so I hope I'm on topic for you. Good luck with your search.