Lets face it, The McCormack amp will jump out an " get " you if your not careful. Any tube preamp is going to quiet it down some, as well as give it a sweeter sound and more depth. I once had the DNA-1 and I tryed the CJ PV-12, VAC CLA-1, and the BAT VK-5. All of them hepled to tone down the DNA-1 and give it better everything. But then one day I hooked up a cheap tube amp to one of the tube preamps. I was totaly blown away! Yes I lost a bit of bass, but everything else came to life. Do yourself a favor, go listen to a all tube setup.
peace
peace