Yes............ a report, if you please.
Also, if you use the Sophia 274B in a Gen 1 WA6, these might interest you if you have 6SN7 adapters:
https://www.sophiaelectric.com/pages/se/New_6SN7.htm
Sophia offers a smaller 6SN7 if the blue doesn't work for you.
And, after some digging, found TJ tubes, which offers a matched pair of the 6SN7 (from Hong Kong) for half of Sophia's cost. Am guessing (at least hoping) that Sophia is simply test-sorting the TJ tubes and relabeling as their own. Likely the same on the 274B and other tubes.
After a few hours of listening to the WA6 Gen1 with Sovtek 5U4G and a pair of Tung-Sol 6SN7 tubes pushing a pair of Focal Clear it would be difficult to be more pleased. Great sound. Have a NOS JAN 5U4G inbound to try, as well. BTW - my WA6 is, according to the seller, pretty much NOS. He decided after ~20hr that he wasn't a tube person. So, it, like my Clear headphones, is still breaking-in.