Rotarius, thanks for the summary of your equipment and room. I am a serious tube-aholic, but I'm not going to suggest you need to switch to a tube amp. While I'm not familiar with your particular Rotel amp, the Rotel gear I've heard has always sounded competent to me, not plagued by serious issues in the top end, and with adequately designed power supplies to meet most reasonable demands.
Instead, what I would encourage you to check first are your connections given your experience with the center pin locking RCAs. If you haven't done so, give all your connections a thorough cleaning (isoprophyl alcohol with cotton swabs is very effective, and a cleaner like "Kontak" is even more effective) and then apply a good contact enhancer (such as Caig's Pro Gold, or even better would be Walker Audio's SST or Extreme SST) as you re-connect everything. I'm consistently amazed at how much of a difference clean, tight contacts make in system performance, particularly with the high frequencies.
And then, it just may be that you need to join many of us by switching to a tube amp (and adding a turntable!) to reclaim what you once so enjoyed about classical music and the beauty and delicacy of great string tone. Good luck!
.
Instead, what I would encourage you to check first are your connections given your experience with the center pin locking RCAs. If you haven't done so, give all your connections a thorough cleaning (isoprophyl alcohol with cotton swabs is very effective, and a cleaner like "Kontak" is even more effective) and then apply a good contact enhancer (such as Caig's Pro Gold, or even better would be Walker Audio's SST or Extreme SST) as you re-connect everything. I'm consistently amazed at how much of a difference clean, tight contacts make in system performance, particularly with the high frequencies.
And then, it just may be that you need to join many of us by switching to a tube amp (and adding a turntable!) to reclaim what you once so enjoyed about classical music and the beauty and delicacy of great string tone. Good luck!
.