Kenny Burrell's album Midnight Blue

Hello, I really love this album by Kenny Burrell. Over the years on my system whenever I listen to this album, Burrell's guitar is prominent out of the right speaker while facing my system (and saxes are on the left facing my system). Recently I changed out my preamp and, on first listening to Midnight Blue, Burrell's guitar was now on the left and saxes on the right, opposite as before. I must have inadvertently changed an interconnect connection along the line. So, this is the question, How does one really know what channels the instruments were originally set with any recording, right or left?  I know this sounds a bit petty, but I would want to be listening to how the artist originally intended a recording to sound and what channels the various instruments were intended.  Does anyone know what channel the guitar in Midnight Blue was intended? Thanks, Jim