My experience is limited but w.r.t whatever I have heard my (short) list is (in particular order) :-
Bel Canto SET40 esp with manuf provided cryo'd 12AX7 + power supply & coupling cap mods. Superb sound, very musical, midrange to die for, not the best bass control. Better with higher efficiency speakers.
RM-9 Mk1 (Ozzy's amp) - excellent overall sound. Superb PRaT. (Wonder how much better it is in its Mk2 rendition? :-))
K&K Audio's Vivo amp - 300B-based 30-35W/ch stereo P-P amp. Very musical, excellent soundstage depth + width, midrange airiness. Better with higher efficiency speakers.
Bel Canto SET40 esp with manuf provided cryo'd 12AX7 + power supply & coupling cap mods. Superb sound, very musical, midrange to die for, not the best bass control. Better with higher efficiency speakers.
RM-9 Mk1 (Ozzy's amp) - excellent overall sound. Superb PRaT. (Wonder how much better it is in its Mk2 rendition? :-))
K&K Audio's Vivo amp - 300B-based 30-35W/ch stereo P-P amp. Very musical, excellent soundstage depth + width, midrange airiness. Better with higher efficiency speakers.