Does anyone leave their amp and preamp on all the time?

No, mine are covered 24/7
when I do fire up, I power on the night before, leave them on all day, so when I come home,Friday night or Sat night, they are ready to rumble.
 When I’m done listening, I power off and unplug them.  
Amps, preamp, and CD player are powered on night before a good listening session.   Best time is from 12-4 am. When power is strong.
 Hard as I’m not a night owl, but the speakers relax me, and I have never had fatigue since I purchased my grail speakers!

I can afford to leave mine on 24/7 because it is very high efficiency. I have owned all tube systems, and class A & A/B amps. For me the inefficiency of A/AB electrical idle costs are their Achilles Heel, and so I have l searched for comparable sound from class D amps.


I have owned 5 different mfgs class D offerings. Overtime, they have improved significantly. Case in point (fast forward to today) Ric Schultz's EVS 1200 is dual mono, using the latest IcePower 1200AS2 modules,  pumping out 600wpc in 8 ohms, which he then mods. Unlike 4 of the other well known amps, this one has taken my Emerald Physics KCIIs to a much higher level, no longer needing my 2 SVS 12" subs to get solid, tight and tuneful bass


It's a bargain at ~ $2300 and has a 30 day money back
hth

I have a Class D amp in my bedroom that I leave on all the time.  It doesn't use much power and I'm too lazy to bend over and turn it on and off.  My two integrateds (one Class D, one class A/B with a tubed preamp), and my main system (tubed monoblocks and tubed preamp) all get turned off when not in use.

I am all tubes so no.

leave my Moon 280D on all the time.