does your system "warm up" and then sound better?

Mechans, the answer to the OP's question would be yes to both SS and tube amps sound wise, would it not? A good 2 hour warm up for tubes is a must anyway. Lots of class A SS amps are better off with a warm up period also, cost wise. Unless you double up your amp as a heat source. Any component will sound "better" fully warmed up. More like at it's "best".

I could be dead wrong about this, but I think a passive device performs best when cold. I still have no conclusion as to why there seems to be an increase in performance after pausing my CDP. I still suspect it could be the crossovers cooling down a bit in the interim. They can and very often do, get sizzlingly hot. After all, a super conductor has theoretically zero resistance. I leave my SS amps on 24/7 also. But I think the reason they sound their best warmed up is because this is when offset and bias become stable. Not because the flow of electrons is optimal.

I used to own a 1973 Cadillac Deville. It had a 472cu.in. motor. This pig simply would not warm up until I started actually driving. No matter how long it sat idling!

Okay, but why does it then fall off again? And is there a way to prevent it from happening?