Very curious to see how the tubes work out for you! I’m about to finish building a Tubes4HiFi SP14 preamp and will be needing to order a quad of 6SN7’s for it.
Been leaning towards the Black Treasure CV181, but have read good things about the Linlai E-6SN7’s. otherwise it’s going to be some NOS Sylvania.
The prices from AliXpress are really good on the Linlai.