Amplifier warm up

+2 atmasphere.  Are not most components within an amplifier designed to be at spec once they reach thermal equilibrium? 

@millercarbon There's no such thing as warm-up, and certainly nothing needs to be left on all the time.

This is from his lengthy post on the other thread on this subject, just this week  Which is it Chucky?
Of course it takes time to reach thermal equilibrium. A shorter time for tubes than transistors.

My JC1’s live in standby, and they start to sound their best about 1 hour into a listening session starting at 5:30 on a Friday evening.   A Sunday morning with JS Bach is sublime at about 6am, with about a ½ hour of playing time. I suspect it’s a combination of time of day/power grid activity and transistor temperature stabilization.  Most natural phenomena have several factors operating simultaneously.  Science is so... complicated. 

I'm a bit skeptical of manufactures who say that their products need hundreds of hours of break in before performing or sounding good. Although some products do benefit from a break in period (several hours, not hundreds of hours) It has been my experience that good products will sound good and perform well out of the box (so too speak) after being allowed to warm up. I do know that some amps, pre amps DACs and CDPs (old or new and some more than others) will improve in sound after being allowed to warm up before giving a serious listen.

My, tubed pre amp sounds better after about 20 minuets of warm up, but I can't hear much, if any difference, after that. It just sounds really good. I shut it off when I am through listening, to save on my tubes and power bill, if I'm not going to be using it again for several more hours.

My Integrated tube amp sounds best after about 1/2 hour of warm up and I can't hear any difference after that. I also shut it off when I'm not going to be using it for several hours.

My old ADCOM SS power amp sounds best after at least 8 or 10 hours of warm up. When I'm using it in my main system, I leave it on continually. For those with these older ADCOMs, if you're not giving them at least 8 or 10 hours or warm up, you are missing out on how truly good they can sound. Many other SS amps, likewise, sound their best after several hours of warm up....Jim

Once again,  for the community's benefit,  read my article at Dagogo.com; 
"Audiophile Law: Thou Shalt Not Overemphasize Burn In", wherein I put both burn/break in and warm up to the test. 

I am uninterested in semantics arguments,  or debate with people lacking experience of actual comparisons of systems side by side.  :)