Old Amps that can still Kick Butt

Several amps come to mind when I think of old amps that still kick butt.  ARC D76 with all the final mods.  VERY NICE.  ARC D79 with all the final mods.  Even better with very good dynamics. These are classic tube designs with a lot of attention paid to details.  They needed regular adjustment to get optimal performance.  The D76 was a great companion to many of the early large speaker systems from Altec, JBL and Bozak.  The D79 was just a great all round amp.  Anything could drive these amps, but the ARC SP-6B seemed the best choice of the day.

ARC D110 (solid state).  Excellent in its day and punchy.  A great companion amp for the larger Fulton systems and speakers with wide impedance swings in the LF..  

And just to add to the mix, a McIntosh 275.  Never really my fav, but a lot of people swore by it.  

@nitrobob

Hafler DH-500s were great amps once their front-end boards were modified.  The biggest problem with the DH-500s was the variable speed cooling fan.  It would always kick on during the quiet passages AFTER the big crescendo.  

Like the DH-500, the DH-110 was a solid amp once the driver boards were modified and beefier power supplies replaced the stock ones.  But stock units were so-so.

Sorry, I meant DH-220, not DH-110.