Good ideas. Thanks. To answer the first question, No to the 5 way binding posts.
To the second concern, the Sony is only connected to the center ch., rear surrounds and sub. The L/R are connected to the Cary. Thats the issue. It means that the Cary must be powered for movies or the radio etc. and he would prefer to save the tubes for dedicated 2 channel and the Sony running the movies and the background times.
Newbee. This is the obvious answer but he is a man who relishes, nay, demands the convenience of a simple switch. Though I bet in the end the switch will cost him the price of a second set of cables. Likewise, switching at the amp end is a great problem because his system is in a built-in shelf and is VERY difficult to manoeuver. (I helped him install everything and don't want to mess with the cables back there again in this lifetime.)
Thanks Zoya. I will check into your post.
So there are no good quality switches out there?