I have been told that there are two versions of the Rhea, and that the newest version is quieter than the first version. The first version was definitely a bit noisy with low output MC cartridges. (My friend used one, and while I agree it had wonderful features, it was never my favorite due to the tube rushing noise.) So if you buy used, make sure it is the latest version.
If you are looking for an alternative recommendation, I hgihly recommend the ASR Basis Exclusive. It is extremely quiet and very musical. (I have two friends who use it, and one of them has now upgraded to the upgraded version, which shows me that he liked it enough to spend double on the gold board version.) If I had the money, I would be using that one myself.
My two cents worth.