Feedback Issue

I am currently running a McIntosh C29 preamp along with a McIntosh MC2205 amp.  My turntable is a Technics SL1200-MK5.  I also am running an Aurender A10 as my streamer.  My speakers are old Infinity RSM that I rebuilt.  I recently acquired an audio rack and setup all the components in this rack.  After the move is when the problem started.  If I stream, I can do it all day long with no issues; however, when I switch to vinyl, I get major feedback through the system.  The feedback sometimes starts immediately, other times it will start half way through an album.  I tried both phono 1 and phono 2 RCA inputs on the C29 with the same results.

Any suggestions where to start?