Most Musical 6NS7 tube for a Preamp?

Good preamp  recommendations.
I've been tube rolling 6SN7's for years and there are tubes with prodigious bass, such as NOS Tung Sol and RCA. Low-end response also depends on the signature and synergy of your components, and the room itself.

The 6SN7 is in my opinion the best tube for a line section in a preamp.


Back when we started using them the tube was considered obsolete and no-one used them at all. Obviously that’s changed in the last 30 years!

The Pass Labs XA25 only has single-ended inputs so the 6SN7-based preamp can be quite simple. Just make sure that the preamp is not going to have a problem with the input impedance of the amp, but the XA25 is 47K so should not be challenging for most preamps.


IMO/IME a simpler circuit is better- less to go wrong.


The best sounding 6SN7s of current production are coming out of China. We’ve seen fairly short lives out of the Sophia tubes, but otherwise the Chinese boutique 6SN7s seem to hold up well. I would stay away from the Russian fare unless you are able to find 1960s-era Soviet 6SN7s which are excellent.


The best of the Americans are the Ken-Rad, Metal base Sylvania Chrome Dome (WW2 vintage), the RCA red base, probably in that order, and assuming the individual example you find is actually good. But almost any American made 6SN7 is a decent tube- even the RCA coin-base tube.

The Chinese Shuguong tube is a copy of the Phillips JAN (Joint Army-Navy) 6SN7 and sounds very much like it. We’ve had good luck with this tube- they seem to hold up for years.


Of course its a simple fact that with high performance tube equipment, the tubes **must** be handpicked for low noise and low microphonics.


Have fun!!

Why no Schiit? The Freya is world class.

Thank you gentlemen for the education and experienced commentary.
This is why I enjoy Audiogon. 

I am trying to learn about 6SN7 tubes and even though I erred in the Subject line as 6NS7 no one felt the need to mention it. 

I am also shopping for a preamp to go with the Pass XA25 that is
supposed to arrive Friday. Input Impedance 47k.

Must haves include:
-Remote
-6SN7 tube
-Most musicality/$

Must not have:
-the words "headphone" or "schiit" attached
-over 5 years old and one owner.

A true bonus:
-trial period

Preamps I have recently owned:
-Audible Illusions L3A-Only dislike was the sound
with or without it seemed the same. Shouldn't a
preamp improve the sound or is that a myth?
 

Brands of Intrigue that fit my $3k budget:

-Supratek
-LTA
-deHavilland
-Audio Note-(likely too high even used)

Thank you again for sharing your knowledge 
and providing me excellent guidance.

@atmasphere 8,170 posts04-29-2020 9:00am
...

The best sounding 6SN7s of current production are coming out of China. We’ve seen fairly short lives out of the Sophia tubes, but otherwise the Chinese boutique 6SN7s seem to hold up well. I would stay away from the Russian fare unless you are able to find 1960s-era Soviet 6SN7s which are excellent. ...

Yep, agree. Was hard to believe, but true on my end too. The past two years of CN tubes are improving for sure. After restocking up on vintage RCAs, Sylvanias, others, and recent TS re-issues - compared again recently. The new CN stuff is inching closer now. PSVANE acquired all tooling/methods from TJ Full Music [small tubes] after the old man passed. Now with the reported Shuguang fire last year, will be interesting to track new developments this year on 6SN7s, other 12Ax,t,u,7 tubes too. Re-trying some small CN PSVANE "T-Treasure MKII" version input tubes now, made in 2020, better than 2012-2016 versions I tried before. So what’s changed...hmmm. Kinda getting closer to my mid-1960s Blackburn Mullards, maybe improved in some ways too with midrange and wider soundstage. Maybe a tad less texture, more burn-in required. Was not expecting that. Re-evaluating periodically to check my own hearing or wondering if I was imagining it. Nope, not imagining it, inching closer :)
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