Always ON?

I always leave all my equipment on .Some of my amps especially the yba passion 1000 and the gryphon antileon signature (can also be used as room heater in the winter) take hours to equilibrate.Most electronic devices are subjected to a voltage surge when turn on which can lead to failures.Solid state devices like to operate at steady temperatures and to avoid fatigue failure due to thermal cycling which occurs everytime you turn your equipment on or off.I have very little tube equipment and cannot speak to the best options there.

My last solid state equipment lasted 20 years before I grew tired of it and needed to upgrade. I turned it off after every listening session and it never failed once because of thermal cycling.

Chuck

My experience (with my amp) is the same as Chuck's, except I haven't upgraded it yet.

Tubes I turn on 1/2 hour to 1 hour before listening.

I leave my phono preamp on all the time.

I have a Sony XA777ES that I leave on all of the time because it has been modded with black gate capacitors, and they take hours to warm up. I'm talking about 12+ hours.

I don't know what's best for the equipment, but I know leaving them on sounds the best.

Change in sound over time is common in speakers. The problem is acute with lower cost drive units.

Heating of the voice coils while playing music causes thermal compression. This reduces the dynamic range audibly and can cause drifts in the way the crossover performs in passive designs. It is partly the reason for blowing speakers at parties...volume goes up until it sounds good and loud....after half an hour the speaker voice coil gets very hot....sound levels/dynamic range drops due to rising coil resistance...so volume gets cranked up again to compensate...speaker coils get even hotter...=> eventually leading to failure even though sound levels may be no higher than when you first switched it on!

If you find that your system sounds better after half an hour of playing, it could be that your speaker manufacturer may have designed for your speakers to run optimally at a certain voice coil temperature (when warmed up)....or you may simply not like the uncompressed bigger dynamics when the voice coils are cold.

Large profesional studio monitors deliver some of the biggest dynamics available on the market but people who have only been exposed to consumer audio often find this too startling and not to their taste.