I've tried a few 6sn7's in my AES preamp. The RCA tubes can have a loose mushy bass. Tungsol round plates have a leaner tighter bass with excellent detail but a pair can be pricy. The most abundant bass is the Ken-Rad 6sn7Gt but the top end can be not as clear.
Sylvania 6sn7GT produced 1951-1953 are excellent with great detail and a powerful well controlled bass. These are a few you could try.
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