To @moose89 As a former Nak fan and owner myself, certainly can appreciate if you found a nice match for yourself pairing this the DH 300B. With that said, paring one of Dennis' preamps with his amps brings its own presentation for sure. Sure appreciate mine, and feel the preamp with the right tubes brings its own type of sound and enjoyment.
A good friend of mine is setting up to resale a good portion of his Inspire amp collection, however the one piece he confirmed he will be keeping is the Inspire preamp, fwiw. Both of us have tired our DH preamps with many different tube and solid state amps with enjoyable results. Enjoy your preamp, it's always fun to find a great combo that works well together.