This may be out of left field but..............
After a short time I found the combination of my SE's, and my speakers to be so transparently resolving that the presents of my tube preamplifier had me listening to the preamp. There is absolutely nothing incorrect about this after all this is all about a matter of taste and I can't comment on the P8.
I would strongly suggest you audition a battery powered preamp against a tube model along with a player/DAC with tubes in the output stage before you commit.
After a short time I found the combination of my SE's, and my speakers to be so transparently resolving that the presents of my tube preamplifier had me listening to the preamp. There is absolutely nothing incorrect about this after all this is all about a matter of taste and I can't comment on the P8.
I would strongly suggest you audition a battery powered preamp against a tube model along with a player/DAC with tubes in the output stage before you commit.