Here is a Decware ZROCK2 in excellent condition. It works as it should with zero issues. IMO, this unit made the Decware UFO shine. Dial in the perfect amount of low end. Gives the music weight, presence, and low end. Super easy to dial in. If you’ve never heard your UFO with this, you really don’t know what you are missing. Comes with Gold Lion tube.
I absolutely love this thing but recently purchased a Modwright modded streamer that has a built in preamp that does what the ZROCK does.

That didn't take long. Good deal