Both of my preamps (2 rooms) are designed with on/off switches, which control power to other devices plugged into them(I do not do this). The active circuitry was designed to always be on. I also leave my power amps on all the time, as well as my dacs. My transports, tuners and other sources go on as I listen. I find that amps sound better when on 24/7 as well as dacs. I do not use tubes, even though I own horns....
Do you leave your components on 24/7?
Lately I've been leaving my components on all the time, on the assumption that a) they'll be ready when I want to listen, and b) the on/off cycle ages the equipment (tubes, anyway) faster than leaving everything on. Is the latter a reasonable assumption?