Many moons ago I bought a Classe solid state preamp. I was surprised that it had no on and off switch! I presumed that solid state is better if it is left on all the time!
Amplifier warm up
I was plalying Boz Scaggs, "Silk Degrees" LP. After side one, I ate dinner. One hour later I played side 2. The second side sounded clearer, more vibrant with better sound stage. I have a Parasound P6 preamp and Parasound Halo A21+ amp. Is it possible that an hour of warm up improved performance?