As a point of comparison my O/96's sound substantially better paired with a LM805ia than a Pass XA30.8. The SET circuit just allows the DeVore's to shine. I do want to get them paired at some point with a Shindo 300B amp but very happy for now.
I have a pair of O/96's and probably have an ideal room for them. It's a fairly lively room but pretty well treated. Listening position is 9 feet from the speakers and I have the DeVore's pulled out 3 1/2 feet from the rear wall. I sold a pair of Spendor D7's befpre moving to the O/96's and it was just what I needed - a break from the hifi-ish sound with perhaps unrealistically tight bass and leaning a tad bright (D7's) to an easy-flowing, organic presentation with the the O/96's. Have them paired with a Line Magnetic 805ia (48w SET) as a power amp and a VAC Renaissance MK5 preamp and I couldn't be happier. I love the versatility of these speakers and will get a 300B amp at some point. Agree with @jlarryk 's comments.
FWIW...I heard the Devore O series speakers on about 4 different amps.2 that I can remember are the Leben (CS300 I believe) commonly paired with the O series. And Nagra (classic integrated...I think). I believe one of the other tube amps was a WAVAC.
Those are all good amps to demo DeVore's although the Leben CS6000 sounds much better than the 3000.
This thread got me curious about comparing the Cary SLI-80HS (40w push/pull in triode mode) currently in my 2nd system against the LM805ia (48w SET) with my O/96 speakers. I did this today and frankly the Cary sounds horrible in comparison with the Line Magnetic - 2 dimensional, lack of dynamic range, no textures, no nuance. I was actually shocked.
And perhaps just as shocking is the fact that the Cary sounds much better paired with my Klipsch Forte III's than it does with the O/96's which cost $10K more. With this said the LM/Devore combo is still substantially better than the Cary/Klipsch combo but the experience was really interesting. Synergy is a funny thing. ;-)