"Cars are Cars" by Paul Simon...are my channels reversed?

If we assume the Spotify is correct then your new amp’s core has to be assumed correct also.  If we make an initial assumption nothing is flawed this would leave the turntable and cartridge connections to again be reviewed.  Do you have any orchestral vinyl with a set left placement of the violin sectIon you could use to also double check right and left placement?  Does the turntable have hardwired cables from cartridge to the amp?  If not double check your RCA Interconnect at the turntable.  Also review right and left connection at the amp/preamp just to triple check...  if all those appear correct then the question is the cartridge connections.  Did you mount the cartridge yourself?  Some manufactures have slightly different arrangements of the pins on the back of the cartridge.  Ortofon is different between their MM and MC.  This is likely a place an error can be found and easily corrected.

I don't happen to own the particular Paul Simon album in question, but you might try playing some albums that feature jazz trio or quartet.  In such an ensemble, the pianist is typically on the left and the drummer on the far right, with the bass player in between.  OR, there is a Stereophile test CD with left and right channel signals, for just this purpose.  In other words, as I mentioned earlier, the ball is in your court.  Mentioning the Stereophile test CD also brings to mind that it has tracks for testing system phase.  If one channel is 180 degrees out of phase with the other, this can wreak havoc with left/right localization.  Check it.

Hi 

I have an American pressing. On “Cars are Cars”the lines Drive ‘em on the left and Drive ‘em on the right appear in the Left and Right channels respectively. 
Hope this helps.

Ian

Thanx, all.
Ian, your post was particularly helpful. I'll now assume there's something amiss in my new rig and will get to work.

I’d start at the cartridge pins, first of all.