Hey Dave, yeah, well, the triode mode of my SLI-80 is definitely sweeter than the ultralinear mode, and more liquid and present and realistic than most amps - certainly all the solid state ones I've tried. I think that the SLI-80 amp sounds and looks great. I have the impression - and this is only an impression - that it does NOT have that last ounce of smoothness and realism that true SET is alleged to have. I've done some tube rolling and experimenting with the bias, it's fun.
I've been thinking of trying an SEI300 with my Silverline Sonatina II's, which are more SET friendly than Proacs (my old Proacs 2.5 benefited from lots of power, and smaller Proacs probably need even more power to get moving.).
Art
Northern California