Best so far
Tried some Gold Lions, NOS ones but these are incredibly good. I read some say to harsh in highs, dominant highs ect but this is simply not the fact. Very detailed but still natural and soft. Ordered a spare set, period. Worth the price!

Bon, mais...
Pour la sonorité c'est plus fin dans le médium aigu que les tubes d'origine du xDuoo TA-20, équilibré avec du grave, les aigus sont plutôt doux.
Tubes assez neutres, j'ai un peu la même impression avec des PSVane 6sn7 (cv181) en étage préampli sur un autre intégré à tubes pour casque.
Par contre l'appairage des 2x 12au7 pas vraiment top: sur casque en 6,35 asymétrique la balance est décalée vers la gauche, sur casque en xlr 4 pôles symétrique c'est légèrement décalé vers la droite!

How good are they?
Oh man they are really, really good! I was happy with the sound in my hifi system. Tube preamp and 2 circlotron circuit mono blocks, running el34 Psvane el34ph, nos Philips ecc82 and Sovtec 12ax7. Had the old tubes measured and the 12au7 were sort of ok, but just, so I decided to replace. Bought the Psvane 12au7 from Audiophonics and received them within a few days. First impression.. after no burn in, alittle harsh sounding, but.. wide soundstage, incredible detail, 4 layered voices are heard seperated, clearity, defined bass, mids, highs. I hear things I didnt hear before, so impressive! Mind you, I guess the Psvane el34ph in combination with these work really well. After 6 hours of burn in the rough edge is almost gone and I bet this will get better giving them more time to relax.

The price on these is really low, compared to nos tubes, and what you get are exceptional sounding tubes. If you want to experience the next level.. get these and you wont be disappointed!