I have had my amp combination for years. I almost always leave my Linn Kolektor preamp on 24/7 but turn off the Rotel RB850 power amp whenever I don't use it and turn it off every night. Recently I find I turn off the Kolektor overnight about twice a week at least. I only find a real difference in sound if the Kolektor / Rotel is turned off for long periods example if I've being away, it takes a day or two for the sound to blossom again.