Irvrobinson:
With regard to amplifiers, global feedback is indeed an issue and I ask whether you have heard no global feedback amps like DarTZeel or Ayre (or no-feedback tube designs). Rowland went with a no global feedback design with his new 625 stereo amp and there's a reason for it.
Regarding my VAC monoblocks, top-flight tube amps, with stiff power supplies and high-quality output transformers, basically function like a solid-state amp into a speaker, unless the speaker features wild impedance swings. The Salons do not and in my particular case, they measured basically flat in-room from 40 Hz. to 16 khz.
PS - To me, most digital sounds pretty lifeless.