Just to update . . . I removed the CD player from the loop and this had no effect. It's looking like it's the preamp.
Bigtee - thanks for the post. I don't know enough about electronics to have an idea about DC vs. AC but I will definitely bring it up when I speak with the seller.
Thanks to all who posted.
Bigtee - thanks for the post. I don't know enough about electronics to have an idea about DC vs. AC but I will definitely bring it up when I speak with the seller.
Thanks to all who posted.