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PSVANE 12Au7 12At7 12Ax7 "-T MKII" 2020 production run of small signal/driver tubes

Re-testing year 2020 production run of these tubes. Would like to hear from others who’ve re-tried recent production?

>>PSVANE 12Au7 12At7 12Ax7 "-T MKII" small signal/driver tubes made in year 2020"

Background:
After following stories about TJ Full Music’s founder passing, and the son reselling tooling of all of the small signal tubes to PSVANE, and recent luck over the past year with TJ 6SN7 tubes for my preamp, I thought I’d give the new PSVANE small tubes a retry. Checking to see if any designs or manufacturing goodness made it over to PSVANE yet from TJ. Also, took advantage of an opportunity to buy these direct from a major overseas distributor, direct. So far so good. Comparing to other known vintage tubes. Also following AudioNote’s recent use of PSVANE tubes in their preamplifiers, amplifiers, integrated amplifiers.

GOAL:
Find something "close enough" and hoard away all my vintage tubes. An improvement is always great too.  

COMPARISONS to vintage, others:
-Currently comparing to my vintage stash of 1960s Mullard "Blackburn", Tungsram, RCA, Sylvania, others.
-Also comparing to prior 2012 versions of these same PSVANE tubes made over eight years ago.
-No need to compare to new re-issue Mullard or JJ or other. Seems these new PSVANE are on a different level.

INITIAL Impression first 20 hours:
-a tad harsh and grainy
-midrange is obvious
-top end not rolled off
-sound stage front row, initially
-decent, interesting

AFTER 72 hours burn-in:
-smoothing out nicely, not there yet, close
-sound stage dropping back to mid-hall
-texture starting to come in
-nice midrange, top end smoothing out more
-tone of piano and guitars shaping up nicely
-Nice, haven’t pulled them yet!

APPLICATION
My mono tube amplifiers
(2) Input tubes; 12AU7s
(2) driver tubes; 12AT7s
Friend testing in his preamp
(2) Input, preamp: 12AX7s

------------------------------
REQUEST:
Would like to hear from others who’ve re-tried recent 2020 production of PSVANE 12AU7 or 12AT7 or 12AX7 ?
What are you hearing, are they better than prior PSVANE versions you tried years ago? Similar findings or ???





decooney
earthtones
104 posts
 
Does it have to be 2020? I have a set of the 12Au7s that came with my PS Audio BHK Signature preamp that I bought at the end of last year. I think they sound great, better than the highly rated Radiotechniques that I just got. In this circuit, which can also run 6 volt tubes, I think they beat both the Tungsram 7DJ8s and a very expensive pair of Amperex 7308s. The Psvanes have a holographic quality that I just haven’t heard in the others. They’re clear and smooth, especially in the critical midrange, in which the others were slightly harsh.
decooney OP
1,900 posts
 
@earthtones 
No direct proof other than 2017/2018 year posts by some with mediocre feedback, debates. Now days noting more positive feedback in mid 2019, 2020. Year 2020 was more of a current reference point in time. I tried early versions, they were just okay, not great. 2012 version did not hold a candle to most of my vintage tubes.  To say your 2019 tubes now beat 7DJ7 and Amperex 7308s in your rig is notable for sure, another good reference. At first I thought mine would earn a spot for backup rotation tubes, now thinking they could earn a spot as my top two pairs of  primary signal/driver tubes.  I do like the larger and wider sound stage side to side. What I was not expecting is the tone and texture to come in, and it sure is. Yes, I am hearing the holographic aspect too, as you noted. It's particularly notable when using transparent interconnects. 

BURN-IN: Several different references on various forums claiming 75-100hrs burn-in required before they stabilize and stop changing. Mine continue to improve @80hrs now.  

How many hours on yours now?  When did they finally settle in for you?
earthtones
104 posts
 
I have about 100 hours on them. I think they sounded great right away and I haven’t noticed any difference since. I’m have my doubts about tube break in. What is there to break in? It’s not like there’s a dielectric to form. Or maybe the surrounding electronics adapt to the properties of the particular tube. In any event, if it had changed, it’s been very subtle, certainly nothing like rolling the tubes in the first place.
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