In reply to:
I just leave the amp on all the time...I don't think that this hurts anything.
In my opinion, it's actually better for the unit over the long haul. Turning it on and off subjects the solder joints to heating up and cooling off cycles. Leaving it on avoids the cooling off cycle all together.
I did field service on computers back in the late 80s. It always seemed to me that the servers that never got turned off lasted much longer than the ones that were turned off regularly. I used to have to repair monitors all the time when they were near air conditioners. They would cool off more rapidly than the rest of the monitors in the room when people turned them off at night. Eventually, one color or another would start cutting out and coming back. Resoldering the color driver transistors would fix the problem. The monitors that were left on all the time never needed that fix. The ones not as close to the AC, but turned off every night needed it less frequently.
How hot does the Marantz get when it's just sitting there with no signal applied?
