I leave my SS int amp (Plinius 9200) on 24x7 and I've found that it clearly sounds better vs. not leaving it on. My TT and tube phono stage take two LP sides to warm up, and I can clearly hear further improvement through 3 LP sides.
I also like to turn the tuner on and at volume for 30 min to an hour prior to LP listening because I've found that it helps to warm up the system with some current flow rather than just being "on" -- perhaps this is speaker warm-up as described by Shadorne above, but I think its the amp as well.
I also like to turn the tuner on and at volume for 30 min to an hour prior to LP listening because I've found that it helps to warm up the system with some current flow rather than just being "on" -- perhaps this is speaker warm-up as described by Shadorne above, but I think its the amp as well.