Most of the modern tech DACs are SS so if you wish to have multi-format capabilities, USB input or multiple digital inputs I'd recommend Mytek 192(can be used as digital preamp as well) or Antelope Zodiac. Both of them are available at major pro audio retailers such as sweetwater, vintageking. You will not find any better accuracy and precision in tube audiophile market.
Tube DACs are just the same as SS that normally have an inverting tube output stage to color the sound with tubes that you don't realy need since you already have MC275.
Tube DACs are just the same as SS that normally have an inverting tube output stage to color the sound with tubes that you don't realy need since you already have MC275.