Amplifier warm up

atmasphere = +1 (and; more = better)

The phenomenon is not necessarily universal. Just sayin

I have an F5 (Class A)that sounds great cold and deteriorates slightly as the temp goes up in my room, say 2 hrs later.

Probably has to do with improper bias calibration during the build finish.

Just to add another eccentricity to the forum cool aid, I like my speakers ** toed out ** (again in my particular situation). :-)

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.

+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.