Pre-amp that works good with Classe CA-400

Thanks for your responses. I have been thinking of adding a good tube pre-amp.

I'm a decade or so late in responding, but I would like to add that my Simaudio P5LE is a match made in heaven with the CA400. They're both fantastic amps. Nevertheless, as funds permit, I intend to convert all of my components to Simaudio, changing over to two W10 monoblocks. I can imagine that a high-end tube preamp would be a very nice match for the CA400 as well.

If I recall correctly, and I could be mistaken about this, some of the Classe' amps are a bit on the sensitive side (1.6V?)for full output. If that is indeed the case, some pre's volume control might have limited use. Usually more of an issue with tube pres than ss pres.

I have a Chris modified Sonic Frontiers Line 3 which works great with Classe Cam 350 monos. I am running them balanced and I very happy with the match.