Check your amp and see if it might possibly have connection for AUX out. My older ROWE amp has phono in, aux in, AND aux out. On mine it's a a 5 pin connector with ground in the center, inputs on the outer 2,and the other 2 are the outputs.
I can't tell what model jukebox that is, but from the title cards it looks like CDs. Aren't there RCA jacks coming into the amp already from the CD Player? Couldn't you just put a splitter in there and connect it to your receiver also?