The Weiss DSP501 definitely has some useful DSP features that you might find beneficial. If UPnP/DLNA or Roon are your preferred streaming protocols then I'd definitely recommend it.
You won't find a streamer-only that has tubes in it though; without analog outputs there is no benefit to using tubes for any portion of a streamer's hardware.
Hello
Using a streamer with tube in conjonction with GOLDMUND is not interesting. GOLDMUND is on very fast and transparent electronics, ties will slow the sound and color it. I think the best is PLAYBACK DESIGNS MPS-X and second choice is WEISS DSP 501 or DSP 502 at a more affordable price.
KR