Cary Audio SLP-5 Preamp Tube Replacement.

Hello Guys,

I have stock tubes in my Cary SLP-05 and want to replace them with Psvane CV181-T MKII (6SN7) or you have any other recommendations? I am hoping you can help me if I need to buy all eight tubes or I can do with less tubes. I hope they fit in Cary and which slots I should replace them in? I only use RCA cables and not balanced cables. Looking forward to hearing from you. Thanks.