So everyone is clear here, Washington_highend_audio is in-fact Sophia Electric. I live by their office and met Richard from Sophia Electric during my visit to hear Sophia Electric tubes and monoblocks some time ago.
They are a re-brander / importer for Chinese gear. If they claim to test the tubes, I would insist on individual proof sheets for each tube to prove matching / testing. I have never heard of Sophia Electric offering that. I have owned Sophia's mesh plate 300b's, and they came with generic 300b proof sheets, not actual proofs as one might find with Western Electric and many other premium brands.
They are a re-brander / importer for Chinese gear. If they claim to test the tubes, I would insist on individual proof sheets for each tube to prove matching / testing. I have never heard of Sophia Electric offering that. I have owned Sophia's mesh plate 300b's, and they came with generic 300b proof sheets, not actual proofs as one might find with Western Electric and many other premium brands.