My friend uses this with his Rogue preamp and says it is a lot better than the Rogue stock phono section!
I've used an Eastern Electric tube phono preamp for about 10 years - first with an Eastern Electric integrated (M520 I think), then with a Rogue Cronus Magnum, which I still have, and currently with a PrimaLuna DiaLogue Premium integrated. The EE phono preamp mates exceptionally well with them all. They turn up on the used market here from time to time. If mine ever dies, I will try to find another.
What is the gain from the CM phonostage? How much gain are you looking for?
I feel that for a budget of $500-$1000 one could find a phonostage possessing the required gain for most cartridges that would be superior to that found in the CM. Not slighting the CM, once came close to purchasing one, great product.
I just looked at the Rogue page. The Chronos has a MM phono stage with 44 db of gain and the Pharaoh has a MM/MC phono stage with 40/60 db of gain.
It appears you may be using a low output MC cartridge. You can buy a step up transformer (SUT) or head amp for your Chronos and that should fix your problem.
Here is a link to an inexpensive SUT
My advice on the upgrade is the same. Have more money saved and make a significant upgrade when you buy a stand alone phono preamp.