I am using a Dayton Audio wave link 2.4 GHz wireless transmitter/receiver to send signals from my music room to a second system in my kitchen. Bought from Parts Express. Cost about $60.00. Works great but there are certain limitations. You'll need an output from the preamp and assuming you are sending an output to your amp you'll need a second pre output. Tape out could work or maybe headphone out. Transmitter and receiver work best with line of sight between the two. Call Parts Express with your questions.
Rayd
Rayd