You can try Welcome to Mapletree Audio Design
you will want the SCC1 system configuration controller, I had one made for me custom, by Al Freundorfer al@mapletreeaudio.com
I use it to control 2 tube amps, a CD player, and turntable hooked up to 2 different sets of speakers. I can switch from either amp to one of the sets of speakers, I can have both amps on and switch back and forth to the speakers to hear which amp sounds the best with what music I am currently listening to from either the TT or the CD player. it ran about $450.00 USD 2 years ago, just email Al and tell him how you want it configured and he wil quote you a price then build it for you.