Typically, DACs and tubes mate very well together, since digital is known to be less-than-warm sounding. If you disclose what your DAC budget is, then you will undoubtedly receive some great suggestions.
PS Audio is offering their excellent Perfect Wave DAC (PWD) for $2,000 along with the trade-in of any used DAC - old or cheap. This is for certain a true bargain. I highly recommend visiting their website for details.
I pair my PWD with solid state, but I have heard it with tube gear (ARC amp and pre), with which it sounds spectacular.
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