Ed, a tube preamp will probably sound best with what you have. If your budget allows find a a Don Sachs DS 2 if you like detail or DeHavilland if you like warmth.
If you have a stock DNA-1 I would suggest either a tube or misfit preamp. The stock DNA-1 tilts a bit to the bright side in the upper midrange and treble. The tubes or mosfets could smooth things out a bit.
Back when I was on the equipment merry-go-round and was switching stuff in and out regularly, I found that I quite enjoyed the sound of a Wyred 4 Sound StP-SE preamp when paired with McCormack amplification. In fact, I sometimes think about returning to that setup. -- Howard
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