When to Poweroff amps and preamps


I apologize if this has been asked before but I haven’t been able to find it.  What is recommended for when to turn off the power to amplifiers and preamps?  What if you’re going to be using the equipment within a day or so...power it off completely, put it on sleep if that’s available, leave it on?  What if you’re not going to use  it for a longer time...a couple of days?  A week?  Are there different recommendations for solid state and tube equipment? I’m interested in both getting the best sound and prolonging the equipment life. 
brownsf
My metronome C6 preamp (with tubes) is always on “stand-by” when I don’t play. The Wavac 805: after listening:”off”. To put on your equipment: first Source, than préamp, than Poweramp. For turning off: first poweramp,than preamp an at last: the source.
I have two systems and leave the PS Audio PowerPlants on for both. But I power off my tube integrated when not in use. I leave on my Pass Labs preamp. But everything else that is SS and can go on standby mode I put in standby mode. On my headphone station I power off all the gear that I can reasonably power off. Most of that is SS. One amp is a Schiit Moljnir and I power that off. 
Always off, unplugged from power.
 When I will listen, I will power on amps, pre and disc player 24 hours before I listen.
 All solid state gear.  
 Goes for both my systems, they sit dormant and unplugged until I want to have a listening couch sit down.  
I may go months without listening, and when storms roll in, they are already unplugged.  Vacations, when not in use, they are unplugged and not in use.

as mentioned,  if listening on a fri & sat night, I will power all on, and leave on for the whole day and afternoon starting on Thursday, to allow them to warm up.

  Amps on first and off last has never failed me!

  They always sound better after a good 24hrs+ of being powered on and sitting idle!
 Been doing this since I was a wee mite in 1985 with my first separates system!
always took care of my gear, as I payed for it w my own money!
You may do whatever you feel is right, and works for you.


  
    
You have to turn off tube amps but solid-state amps you can and SHOULD leave those on all the time!
I’ve never had a SS amp fail due due to on/off. Every device is unique. If you can hear a difference with yours and don’t mind paying for unused power, by all means keep them on 24/7. You better have real surge filter/suppression in series for the enivitable electrical storms.
Of course tubes have finite life spans. You gotta pay to play.
Check your stuff with a Klil A Watt.
Most "stand by" uses 90% of the kWh for a few seconds of faster play.
No audible difference with mine.
I even unplug the power sucking cable box off nightly via a timed outlet.