OK, Adydula...you were right! I took that little Vali 2 to my downstairs system, compared it head to head with the little all tubed EarMax OTL amp that I have been using for
25 years. While the Vali 2 was not
quite as tubey as the EarMax, with the GE 5670/adapter it is
close enough that I have retired my EarMax for the time being. I am
really liking this little Vali 2, and can hardly wait to hear what it'll do with a 6SN7 tube, once I can get the adapter.

And that, with the volume pot
barely cracked, because it doesn't sound near as good in low gain mode...no doubt the negative feedback. Headphones are HD 650's.