After another month of listening I am revising my rankings and comments a bit, ranked:
CLASS A
1. Sylvania 6SN7W black base - simply awesome, all around
2. Kenrad VT-231 staggered plates - stunning bass, clear highs - simply awesome, almost tied with #1, but with slightly more visceral bass
3. RCA VT-231 grey glass - sweet, sweet midrange, slightly rolled off highs, but DAMN - nice for the right kind of music that emphasizes piano and vocals
4. Sylvania VT-231 - very, very neutral, a bit lacking in bass, good in buffer position
CLASS B
4. CBS 5692 / RCA 5692 - these tubes sound the same to me and, based on the hype, are a big disappointment. They do sound good but are flat, neutral, lacking bass, and just disappointing compared to #1 + #2.
5. GE 6SN7GT side getter - 1950s - good overall, not detail monsters, but good
6. Sylvania 6SN7GT chrome dome top getter - super yawn, boring, but better than #7 and #8
CLASS C
7. New production Tung-Sol 6SN7GTB - these were a disappointment to me, fairly balanced but kind of veiled and syrupy - these suck compared to everything above
8. Stock Russian tubes that came with Freya - these suck hard compared to everything above
Still have not heard a new production tube that did not suck balls. Is it really that hard to manufacture a tube for audiophiles?
Got some Raytheon VT-231 flat plates on the way for my next evaluation.