I have owned a few NAD power amps and never liked them.The Power Envelope ones like the 2200 sound especially poor-good bass amps but very 2D sounding.A shame because the preamps are excellent.The 1155 that was sold with the 2200 power amp was superb and came with a killer phono stage.
It would take an exceptional amp regardless of age to sound better than an Accuphase P300.[I own one and have had all sorts of modern SS amps that do not come close]
Only modern tube amps will do that.
For not much money you can buy a Ming Da EL 34 A/B tube amp which is a brilliant allround amplifier.