I have the original CLS. Power in the past has consisted of Classe CA200, Conrad Johnson premier 5 monos (in triode and UL modes), 47 Lab Gaincard (it worked well!), Antique Sound Lab 1006-845 monos and lately Electronluv vv45-845 monos (< 20wpc). The amount of power that these supposedly need is overstated.
-Ed
-Ed