Upgrade? Given the cost of these units, just dump them and buy something 'out of the box' perfect.
break-in for Marantz SA-7S1
I just bought a new Marantz SA-7S1. It has 60 hours of break-in on it at this point. So far it's not bad, but it's not all that captivating either. I've heard it takes awhile to break in. I'd like to hear from other owners how long theirs took to break in, and more importantly what the difference was once is was broken in. Thanks!