CDP w/Tube output stage works as Tube preamp ?

Hi, I have been using a CD player with a tube output stage(its NjoeTjoeb 4000). Just wonder does it work as a Tube Preamp ? (I have been looking for a Tube Preamp to replace the preamp section of my SS NADC370 . A few friend of mine told me that I don't really need a tube preamp to get rid of the solid state "edge" of the amp;since the CDplayer can work as good as a Tube Preamp. I really wonder if this is true??) Your opinion and advises is highly appreciated and thanks in advance .
Simon