an amp without "electronic" sound

Chris, you have been busy lately.
No Electronics could sound without a tinge of electronics. Only difference would be to find one with least autonomous electronics. I have not come across any yet. My Jadis Orchestra Ref does surprisingly well but it can't play loud due to power limitation. I am hoping that the Zanden 9600 mono I will audition soon will achieve that.
How about Fm acoustics and Lamms? You have claimed FM acoustics to be the one of the best. Did you try thoes?

Good implementation of SET amplification can sound astoundingly natural and present, as can OTL (the latter having less 'limitations' as SET with perhaps a 'cooler' presentation for lack of a better descriptor - perhaps it is they are more neutral). The SS amps that I've owned that come the closest to having the qualities you describe have been Bel Canto Ref 1000's. Ultimately I prefer tubes, but the Bel Cantos were very engaging to me.

when i was ready to go from solid state to tubes 7 years ago i found that i preferred OTL tubed amps as they seemed to have the linearity of solid state while also having the 'breath of life' of tubes. also; they were not rolled off top and bottom. however; OTL's typically need a very easy load to be optimized. for 5 years i used OTL's.

then i heard the solid state darTZeel amplifier. the dart had the naturalness of the OTL; but also better clarity and was more micro-dynamic.....and no tubes.

if you want a non-mechanical sounding amp but not with tube color.....you need to listen to the darTZeel. it sounds like music to me.

I second the Nuforce Ref 9V2SE, or the MCH3SE if you're into HT. Superb!

Mcintosh amps