Tube rolling McIntosh c2600 preamp?

Has anyone changed the tubes in the C2600 with positive results. My sound stage has good depth but little width. The music pretty much stays within the speakers. I am using the McIntosh MC452 for the amp. Could this be a preamp issue? Over the years I have noticed that swapping preamps had an impact on the width of the sound stage. I like this preamp so i'm hoping it may be a tube issue. Any thoughts?
Thanks,Joe