Conrad Johnson Premier 12 tube monoblock amps, 140W/side.
I've had them since the late 90's (as I remember).
Possibly my best purchase. I love tubes, but needed some that would drive a large variety of speakers (as I switch speakers pretty often). The CJs have driven every single speaker design I've had, of many different designs (including my MBL Omni monitors - very low efficiency) with exceptional control, punch, delicacy and gorgeous tonality.
I don't think I'll be giving them up soon.