I bought a Marantz-Superscope A-260 integrated amp yesterday at a thrift shop. It works perfectly, and matches up well with my AR 4x speakers, even at only 35w. I don't have a manual, and the picture below is from an Ebay ad. My questions are: What is the "inter coupled" switch for on the back of the unit? It's set in the "on" postition with a protector that is screwed on, telling me that it's not for ordinary usage. Also, how does the "Quadra Phase" work? Is it fake quadrophonic? Thanks!