Just received my NOS GE 6AQ8 tube and it sounds great!
I am using the Aune T1 as a DAC streaming from my iPad to a vintage Marantz 2270 receiver through a pair of Linn Sara speakers.
I am not great at describing what I am hearing, but my impressions are that this tube gives a little more detail than the stock tube. The other word that comes to mind is more natural sound where the 6922 was a bit more "clinical" sounding to me. Also the mid range seems a little more present.
A big thank you to Arcorob for doing the legwork to help find some of the best sounding tubes that do not cost an arm and a leg!
Lol you mean me!
BTW a few more tubes will be added to the list soon.