I've had a rash of different amps rotated in front of the Horns.
A Dynaco SCA 35, a Dynaco ST-70 plus a Van Alstine Ultimate 70, an ST-35 clone, a dual-mono 300B, an upgraded Teac class d amp, and one of those little plastic chip amps, the Sonic Impact.
And unless you think I'm a total bigot against solid state, a Bryston B60 sounded very nice on the Horns as well.
NONE of these amps sound bad, it is just that I like the sound of the S.E.X. amp, in my circumstances.
BTW, I used AmpOhm caps if memory serves, after Jim brought them up. No regrets there.
I'd say that I got a clearer upper and bottom octave, or something close to it, from the caps and iron upgrades. Since I have a lifetime of tinnitus, the clearer the better for me, and I like what I've been getting. I might have to buy a Stereomour though, once they show up..
You know, just to have a listen....;-)
Best Regards,
DeadFish