I am an amp freak.
1987 Harman Kardon Receiver(don't remember model)
1991 B+K ST140 (not much difference from above)
1997 Dynaco ST70(more engaging than ST140, light+lively)
1997 ARC D90B (more power, cleaner, Less dgangly, less engaging)
1998 Mark Levinson ML9 (wonderful amp, clean, warm ,involving)
1999 Mark levinson No23 (as above, phenomenal bass)
1999 Mark Levinson 332 (more detailed but slightly etched, could sound harsh)
2000 Gamut D200 (wonderful, light+lively, full of life like a tube amp but with lots of detail, no etch)
2002Gamut M250 (as above with more bass power+control, bigger soundstage)