My system is well broken-in. Before playing music I always turn on the system for about 20 minutes to warm up the tubes. Even so, the tube phono stage and tube preamp need to have musical signal passing through them for about 2 sides of an LP before they sound their best. I will assume the speaker drivers warming up plays a role in this as well. No matter what, the musical listening pleasure always increases around the third side of playing LPs. And on Saturday night, after a couple glasses of wine and a couple of hits, it definitely sounds much, much better.
Enjoy the music!
Enjoy the music!