leave them on! I have a few adcom pieces too, and by keeping them on you keep the caps energized at all times and warmed up. I would suggest NOT plugging ANY amp into ANY line conditioner unless you are laying out lots of $$$$$ as most line conditioners (for amplifiers, that is) do nothing but constrict the power getting to the amp, which in turn will reduce your transient response times, and reduce the quality of your soundstage, just give it a try yourself, try running your system at a good clip after it has warmed up plugged into the line conditioner, then unplug the amps from the line conditioner and go straight to the wall. I will say that there are benefits to having your pre, and/or source components connected to a line conditioner and an upgrade to the power cord of your digital audio components will also make a significant difference. I HAVE DERAILED, anyway thats my 02