03-10-14: Jfmerk
I am still curious on one point... When considering amps and preamps, does one have more impact than the other on the sound we hear? Or are they equally responsible for the end result?
I feel that the preamp has more affect on the sound that we hear than the amplifier, but I'm sure others will disagree. You could always try a tube integrated amp in place of the NAD, in which case you could get the richer tube sound, as Atmasphere suggests, and not worry about the which component does what conundrum of preamp or amp.