what to expect with new preamp breaking in?

I have a newly purchased Meridian G02 preamp and I would like to know what changes to expect when it breaks in? I am asking because I have noticed a bit of grain in the sound. I know the sound will change to some degree, but should I expect the grain to go away once things stabilize? thank you all for any thought or experience that you may have to share with me and others that may read. It has about 10 hours on it at this time and is being used with a new Straightwire blue thunder power cable.

Pete

Pete