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,
I quick acid test with tube preamps is do they have a power switch in front. If so, the designer probably meant for it to be turned on and off regularly. Most will have a standby switch. When I was younger (27 now) and home more I would leave my tube pre on standby 24/7 and switch it on anytime I would listen (which was often several times a day). Now I do most of my listening on the weekend, so I switch it off until I use it. No sense it leaving idle for days, IMO.

Actually my cartridge takes longer to warm up (4 sides of a LP) than my tube preamp and power amp take (20 minutes). So I now leave my tube gear off. I do leave my solidstate phonostage and digital gear on 24/7. I don't hear and warm up effects from my phonostage, but I do from the DAC. And it takes a full 48 hours to settle it. So it must be left on all of the time.

During the weekend, I'll put my tube pre into standby if I'll use it within 8 hours. But my tube amps I'll turn off if I won't use them within 60 minutes. No sense it burning up power tubes. But the flip side is it makes to sense to constantly cycle them on/off several times in one single day. I get 2 years out of a set of output tubes. IF the power amp is left running 24/7 I'd need a new set every 6 months. Time to get that 845 tube amp right? Hahahaha.