TMAC, I also have a Coda 8. Previously had a Don Sachs Model 2 preamp and they mated well but I could never eliminate the tube noise even with help from Don and using balanced cables (even though his xlr connectors were not balanced).
I then purchased an Aric Audio Motherlode 2. This eliminated the tube noise but the soundstage still wasn’t being delivered. It was rather blasé and uninviting no matter the tubes I rolled.
While the Aric was extremely well built, it didn’t make any magic for me.
I sold it at quite a loss and replaced it with an ARC Ref 5SE and whalla!, that was magic. Now I am focused on eking out additional soundstage through cabling. The match between the ARC and the Coda with xlr cables is about as near dead quiet that I have ever experienced. Music comes out of a black background. You can check my system page for me info.
Best of luck in finding the match that delivers the goods. Happy new year.