Recommended sources for tubes


What sources do you suggest for an analog type system? I tried logitech streaming, but it is fatiguing with low data files. What is the best way to get music to this setup? I have fast internet. I don’t have a CD collection. I don’t have a vinyl collection. I would like to stream and play hi rez downloaded files for sure. What direction do I go in?

CAYIN AUDIO A-5oTNola Boxer speakersREL T5i subNo sources
I was considering a  Marantz ND8006 .   Other options? 

petr7
If you want true DSD Hi Res downloads & those speakers I would go with either an iFi Audio Stereo 50 or SimAudio Moon 240i...
If you can forego super hi res the Quad VA-One would be amazing with those Nola's...
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I stream tidal using an Android tablet (with bubbleupnp) to a ps audio perfectwave dac (w bridge ii to keep a full computer out of the system). Coincident 300bs and the PREs. It's convenient and sounds great.