I have always turned on my pre-amplifier and turntable first, then my amplifier last. I did this in the reverse order to turn them off. Starting with the amp than the preamp. What I am asking is, is there any ill effects to turning them on and off at exactly the same moment? In addition to loving two channel, by profession, I am a smart home low-voltage Integrator. I have some very well-built nicely designed controlled receptacles. I am considering using one to turn on or off a nice power conditioner that has all my gear plugged into it and Left on all the time. That way I’m controlling the switch providing the conditioner with power.