I just brought home an NAD 7155, a big brother to my 7140. It's in really good cosmetic shape. Plugged it in and while the right channel is playing as it should, the left is lacking in any low end. Almost sounds a bit shrill and flat if that makes sense. It responds to changes to the tone...
Edit: Solved, see post #7.
Here's a real humdinger. Yesterday, I turned on my NAD 7155, tuned into a local FM station, and left it on in the background. I stepped outside for a second, and come back in, and all I hear is static. It wouldn't pick up any stations at all ... I hit the FM search...