In a word, no. You may warm up the tonal spectrum, or not, depending on your choice, but the real magic with tubes, the REAL magic, is with the amp/speaker combo. The pre-amp is a nice place for tubes but thats much less than half of the magic.
That said there are a few nice 'warm' cdp's out there.
That said there are a few nice 'warm' cdp's out there.