I don't want to dampen your NAD, but get that amp checked out before gigging it - those Korg AC30s are renowned for blowing up. Get the bias checked (might need to tweak the cathode bias resistor - 68ohms is generally perfect and 82ohms used in the older AC30s gets it running cooler again with a gnarlier tone).
On the up side, when cranked they sound awesome - my first AC30 was like yours (a 30th Anniversary model) and was a br00tal amp when cranked with a Les Paul.