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 picked up this one
just got it ..putting it in today...

heres the the list of preferred tubes from mhdt
I have found that the Tesla tube is a nice sound for me. At least equal the the WE tube thus far. 
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Some folks at are using tubes from the ECC88 family. Requires a ECC88 to 6N3/5670 adapter.
How did you get the WE396a with your DAC? I just purchased one and it only came with what looks to be a GE tube. I'm hoping to try the WE396a out soon.
Waterclocker, I bought my Orchid from Linear Tube Audio. They supply and install a WE396a at no extra cost.