switched outlet

Hi, I do have a Marantz 3600 pre-amp running very well with a Marantz 140 but since this week for a specific reason, when I power off the pre-amp, the amp stay on now (before, it power off with the pre-amp. I did not open the Marantz 3600 case for now, but is there anyone having experience of...

Hey guys I recently was given an old Kenwood C1. It worked great for about 30 seconds and then crapped out completely. No lights turn on and no signal is being passed. I have it hooked to an Onkyo m5010 power amp. I may have screwed up by connecting the Onkyo to the "switched" outlet on the...