+1 for Black Ice Audio Glass FX Tube.
2 weeks new to my system. Customer service is outstanding. It’s a big upgrade from the NODE’s DAC. The supplied tubes after 200 hrs is a tiny bit harsh on the high end, but I’ve got some 50’s era Mullard’s coming from Brent Jesse, and that’s the point; if you don’t care to roll tubes, buy solid-state. On sale for $900 right now with an in-home no risk trial.