I was wondering if any of you guys can hear a difference between when your amp/receiver is cold, as compared to when it is at its normal operating temperature?

I ask this due to a couple recent conversations that i have had.. Some of the people have asked if i let my amps warm up prior to listening... Well, i don't, and i don't hear a difference between when the amps are first turned on or when they have been on all day. I usually have my amps/audio equipment on for about 10 hours a day.. Durring the day i usually listen to classical while i am studying, i use the same gear to watch TV in the evening.

I think that this is one of those audiophile things.. One person said that they let their gear warm up for a hour before they do any listening....