Mcintosh C220 issues.

Hey everyone I am knew to site but just recently purchased a Mcintosh C220 from a excellent seller on here.

The issue I am having is there is white noise on the left channel of the Preamp only on the Phonostage very noticeable during quiet parts of my records and volumes of 30+. I have switched tubes around and checked all configuration and the problem is still there. Has anyone had any issues similar to this? Please help. Thanks