Warm-up time for amps and preamps

I leave it all on, even my Lampizator stays on(read manual).  I turn them off if there is an electrical storm in the area or if I am leaving home for several days.  I've had some SS devices that take 3 days to really come alive and do what they are capable of.  Try it and hear for yourself, it won't hurt them.  If leaving it on is going to harm it, you don't want it anyway.

Tube pre and power amps - turn on - warm up - turn off after you finish listening

Solid state - leave on 24/7 for best sound

Everything has a warmup period, regardless of what you do, when you start your listening period.

The higher the resolution of your system, the more noticeable the warm up effect.

I have a bel canto power amp.
Instructions say 40 hours for complete warm-up
from a cold start. So, I leave it on unless I leave town.
Any advice from those with bel canto experience?

Tube should be designed with an "idle circuit" - if not, I'd wonder about the designer.

While heat can be a killer of electronic components, the real killer is voltage spikes.  They can happen from turn on.

Electrolytics from about 20 years ago or so are well known for some longevity issues.  Dunno if they changed the paste or what -- or if so, when...

I've got a Simaudio 700i amplifier and if I unplug it from the outlet it takes several days before it sounds like magic again.  Using the standby switch on the front panel only mutes the inputs and turns off the front panel display.  The amp stays just about as warm in standby as it does when it's turned on without music playing.  I've heard it draws around 70 watts or so in standby and 90 idling.  They must have a reason for designing it in this manner.  I never unplug it or use the rear panel AC switch unless I'm going away for longer than a week or so.