Guys, sorry, don't mean to come across as disagreeable and I understand everyone's here to exchange ideas and info. This is obviously a pet peeve of mine that occurs often in the audiophile community. If you think your electronics sound better after 500 hours than brand new then more power to you...as someone above said this could very well be caused by your believing it should sound better...the placebo effect. I'm going to stay firmly planted in my universe though. ;-)
I would ask you though to continue to try to explain to yourselves why, if an electronics component "drifts" or settles" physically in some way when new, why it always drifts in the direction of better sound. Even if I thought I heard improvement in sound of a new component, I don't know how I could logically explain it always getting better instead of sometimes getting worse if it was due to random changes in some physical parameters.