I would like to trigger my amp on and off when my receiver is turned on and off. The catch is that the receiver doesn't have a 12V output. So, what's the best way to solve this? The receiver does have a 120V receptacle or two, which I believe only supplies power when the receiver is on. I can build something if necessary, but I'd rather just get some off the shelf parts, stick 'em together, and forget about it. Any suggestions would be greatly appreciated! Thanks, Martin.