Over the course of many years, from the mid '80s to the present:
Akai Receiver
Nakamichi Stasis Receiver (still have it!)
Van Alstine Omega III 440HC
Electrocompaniet ECI-4 SE Integrated Amp
Spectron Musician II
Parasound Halo JC-1
ASL Hurricane 200DT
Berning ZH270
Joule Electra VZN-100
Plinius SA-102
Ayre V-5X
BAT VK-600 w/BP
McCormack DNA-500
Conrad Johnson Premiere 350SA
BAT VK-500 w/BP (best of previous 5 SS amps)
Dodd 120 tube monoblocks (still have them, best EL34-based amps I've heard/owned, but available for sale)
VAC Musicblock 160s
Art Audio Quartets (oh yeah, 845 tubes, 50wpc Class A, zero feedback..mmmmmmmmm,mmmmmmmmmm, good!)