Most resolving solid state amp you've ever heard?

The amps that come my mind are the: Spectral, Tact and perhaps Spectron. I haven't had the opprotunity to hear enough of it to make a real determination, but the TacT is the only one I would personally consider.

Another vote for Belles, my 350A (not Reference) is highly resolving but not etched in any way.It also has a high damping factor, giving good control of bass.--Mrmitch

The Parasound Halo A21is a true sleeper especially if you replace the stock -5 fuses to the Hifi tuning Supreme fuses there is 60 amps
On tap on demand and the first 10 is in pure class A, and there's
NO capacitors whatsoever in the signal path. Using Jfets, Mosfets
And Bipolor transistors for the High current output section
And a good power cord such as the SynergisticResearch T3HC
I use . This is one amp that demands you use the large Supreme fuses
That lower the resistance many times lower then the stock steel fuses.
This amp now can compete with amplifiers several times it's price.
A John Curl masterpiece for price performance.

Burmester 911 Mk3 monoblock. What's else??

FWIW, playing with word association: Spectral
comes to mind first.