SS equipment can be left on 24/7.The exception being Class A amps that run very hot. Those should be turned on an hour or two before use and then off after listening finishes. Preamps and Class AB amps that become moderately warm are ok to be on for extended periods. They may benefit by having fewer on/off cycles. I leave the SS gear I'm using on 24/7.
Pros and cons of leaving your DAC on 24/7
I hate waiting for equipment to warm up. But I don't want to kill a components lifespan by leaving it on, if that's a danger. My Musical Fidelity V90 DAC takes a little while to sound its best. I think most DACs do. I leave it on 24/7. Anyone have a problem doing the same?