What you have heard about your gear is probably correct- that is common with balanced equipment. With the single-ended preamp, you will loose the ability to run long cables and the cable selection will get more important to the overall sound.
You do not have to replace the amplifier though unless you are looking to upgrade- but I would not do that until you have had the new preamp long enough to be sure its broken in. The amp will work fine with it.
You do not have to replace the amplifier though unless you are looking to upgrade- but I would not do that until you have had the new preamp long enough to be sure its broken in. The amp will work fine with it.