I deleted my post. Ralph means well and I am just mean.
I will restate though that the Devore O' series play well with a broad range of tube amps. The O/96's can easily overpower a room with excess bass. They are propulsive and lively, but can sound a bit loosey-goosey, the opposite of the buttoned-down analytic sound I attribute to the likes of Magico's and the top TAD standmounts. For that reason for some listeners and rooms a push-pull tube amp with nfb can ameliorate some of that tendency.
I tried my O/93's with a very good SET no feedback amp, an Ampsandsound Nautilus with 8 watts and the sound is sweet but the firmness of the low end and the extension of the treble disappeared.
As Charles1dad said, and it's a cliche' but a true cliche', there are always trade-offs. Your choice of loudspeaker cable will also make a huge difference with the O's. I really like what the Auditorium 23 do with the O's but after a while I think I prefer Cardas Clear Beyond.
The O/96 is magical. It has something about it that the O/93 lacks despite the similar drivers.