KSR PA 50 set up

How is everyone using their KSR PA50 to power their QC. Im seeing some suggestion to just use pre amp captures when running it, Im thinking its because the power amp has the tube character ex. 6L6 and it maybe doesnt make sense to have a capture of the power amp AND pre amp running through the KSR . Is there a specific way to just get captures of tube amps? Or is it a non issue.