@kgbspy, (putin, is that you ???)
makes me wonder if any of you got electronics training
Ok you can climb down from your pedestal now and go ... well go somewhere.
If the component is solid state and does not consume huge amounts of power when in its quiescent state then better to leave it permanently on, unless it's not going to be used for a considerable period.
Those who remember the old incandescent light bulb will know that 99% of the time they blew at switch on. The filament is cold, its resistance at its lowest and is when it draws the most current. POP. Same with the solid state component. When on it warms up and then cools again when powering down, there is expansion and contraction on the PCBs and also condensation. You have now unwittingly provided all the ingredients for failure. Left on the device stays gently warm and should last decades.
For tubes that are permanently on their life will be shortened but there is a work-around. Some amps that have a standby switch just turn off the HT but leave the heaters/filaments on which will, over time, lead to cathode poisoning, however if the cathode voltage is reduced to 2/3 voltage, that is 4.2V instead of a 6.3V supply, all is fine and stripping is no longer a problem.
This feature is not often found but I use it on my DIY stuff. When coming out of standby I arrange for the heaters to come immediately to design V and use soft start for the HT. There is little or no warm up needed as the amp is always and safely warm. 😎