Interested in hearing about tube rolling experiences with the Orchid and other MHDT dacs, namely, the specific comparative sonic characteristics of the various 396a, 5670 and other compatible tubes used in the output buffer. My only experience is with the WE396a that Linear Tube Audio installed in my new Orchid.
I got @pmboyd 's WE 396A. So now I'll have three tubes to play with when my Orchid arrives. Fun!
I know the 'normal' route is to throw money at a problem or spend more with an upgrade. However I found out many years ago with my Havana dac that after a pretty short break in of 50hrs or so the 6H3P Russian tube has all the clarity, bloom, bass slam, and midrange of any tube I've tried. Very cheap yet sounds like a million bucks....easily beat my Tung-Sol, Ratheon etc. They found a permanent home in both my Havana and my Orchid.

Best thing is, since they are so cheap I don't feel bad leaving them on, even when I am away.
Ok, interesting information. I have tried many different flavors of 5670 tube, some obviosly better than others, however, I will never go back to that tube after adapting the socket to emply the 6922. What a glorious difference that made in every respect compared to the stock tubes.