Let's see...
1971: Dynaco SCA-80 integrated (40 Wpc solid state)
1973: SAE (100 Wpc) power amp
1978: 40 WpC Pioneer integrated (went back to school)
1985-1999: had nothing more than a boom box
1999: Quad 405-II (100 Wpc)
2000: Bryston 4B (original), Quad 606, Meitner MTR-101 monos
2000-2005: Muse Model 100 (x 2), Classé Model 15, Bryston 4B-SST, OCM 500, had MTR-101s upgraded, Bryston B100-SST integrated, Meitner STR-55 (upgraded in 2004), Quad II monos (tube; rebuilt to original specs); AudioNote tube amp of unknown model (10 wpc push-pull).
The Meitner MTRs have stayed in my main system, as I haven't auditioned anything else that I've liked as much.
The Meitner STR-55 remains in my office syste for the same reason.
The OCM 500 was a very good amp--I preferred it to a brand new Bryston 4B-SST, but I'm severely downsizing the living room system because it hardly ever gets used, so now I'm back to the Muse Model 100.