I have had many tube preamps and amps. And for each of them, the sound is MUCH better after 1h or more of warming up. The sound is better also later in the afternoon even if my system is in a separate dedicated power line. My main system is Allnic preamp with Shindo monos.
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?