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?