What's the best 6NS7 tube you have tried in your Atma-Sphere MP-3 preamp?

...Or in any preamp that uses the 6SN7 ??

A friend of mine on another audio forum had gotten out of the 6sn7 business (meaning he no longer has the amp that used a pair of 6sn7s as driver tubes) and he made me an offer I could not refuse on several pairs of used and slightly used vintage 6sn7s.

The preamp I use 6sn7s in is a Cary SLP05, and since I only have pairs of these vintage tubes, I am running them in the left & right balanced input sockets. The first pair that turned my head were a pair of Tungsol VT231s; after those I sampled a pair of RCA black glass VT231s, and for quite a while after that I was hooked on those. By no means do I possess the golden ear, but the detail and imaging that I heard with those two tubes in those two sockets was incredible and mesmerized me.

A while down the road, my friend did some more house cleaning and sent me several more pairs (some that I haven’t even sampled yet). But the two pair I couldn’t wait to try out were the "Sylvania ’55 Bad Boys" and the National Union 6F8Gs (with adapters). With the "Bad Bots" the presentation struck me as being very up front and direct, and with the National Unions I felt the presentation was laid back and quite smooth.

I ran RCA black plates in my MP3 for a while (until they went noisy) and liked them very much. Nice lively 60’s rock and roll sound, if that’s what you’re into. I believe Tube Depot has them in stock.

I ran RCA black plates in my MP3 for a while (until they went noisy) and liked them very much. Nice lively 60’s rock and roll sound, if that’s what you’re into.

60's rock & roll isn't my thing, but I really did like those tubes in the front of my preamap in my system. However,  I would have to say that I like both the Sylvania "Bad Boys" and the National Unions better,

When I had an mp-3, I thought the best sounding 6SN7 variant was the

Shuguang Treasure CV181Z from Grant Fidelity

@immatthewj  “60's rock & roll isn't my thing”. Beatles, Stones, Zombies, etc., etc., etc.  What’s not to like.  I guess I’m showing my age 🙃.