Powering off vs leaving on


A friend was trying to convince me that switching my components on and off many times a day is actually worse than leaving them on. Considering the heat put out by a power amp, my instinct says power off. Am I shortening the life by doing this?
billbo
Turn it on in the morning, off at the end of the day. That's better than cycling many times a day. The other choice would be leave it on 24/7. One problem with 24/7 is there can be many short duration electrical spikes a day not to mention one long one that may end your choices pemanently. Good luck.
Update- I called John Hillig at Musical Design, the manufacturer (dont know why I didnt think of that earlier). He said that he leaves his on, unless there is a big thunderstorm looming. Anyway...the D-150B is a great amp for my Thiel CS2.4. Plenty of power and current. They also have great customer service.
I never turn off any of the systems in the store or at home. Great sound is our apex and there's only one way to achieve this, total warmup.
Aroc, HiFiFarm, others -
does the "leave it on rule" apply to tubes? I leave my solid state gear on 24x7, but just got a tube preamp. Do I leave it on? or turn it off each night?

thanks,