I've not had much luck with NADs, 3x3020, 3140, 2x3150 all refurb'd. Tones, dynamics,,, sound great but "no" sound stage. Just finished a repair on a 7125, sounds good through headphones, will test on spkrs later in the week. The 2200, 2600, 2700(?) series of power amps appear to be well...