Tube rolling in Yaqin Pacific Valve Tube Buffer

I am begining to think that the answer may be that the Yaqin tube buffer is supplied with a Chinese 6N1 and was probably designed for that tube. While the 6DJ8 may work, it and 6922/7308 tubes have different heater elements etc.
In fact, in the reverse case, many do not recommend 6N1 & 6N1P (Russian equivalent) in circuits designed for the 6DJ8.
So, maybe what I am hearing is the result of this.

try 5654 tubes or mullard ef95 or 6ak5.i have had excellent results with all of those however i recomend getting russian american and tung sol [which can be found esaliy on ebay or anywhere] is pretty warm very warm to soft for me but when the supplied tubes break in 100 hours or so they dont sound bad even for the price! dont cry because the miracle dosent happen for 150$ LOL!!! great product.

I'm currently using Western Electric 6AK5 1940'S with great results, great improvement over stock chinese tubes. The unit with the tube upgrade alone sounds more cohesive with smoother top end. Consider doing some mods, it will transform this buffer. I have have replaced the output caps to Mundorf M-CAP Supreme Silver/Oil 1uf and removed the input capacitors now wired directly.

The unit I own is the Yaquin CD-2 which uses two 6j1.

I own the single tube version of the Yaqin and was one of the early advocates of the JAN6922 and it does work quite well. That said I have moved on to the Russian 6N1P with even better results. Cleaner mids, tighter bass and equal highs.
Incidentally the tube socket on my Yaqin is labeled with numerous tubes that can be used and the 6N1, 6922, and 6DJ8 are all included. Currently my buffer is in use between a Cayin MT12A amp and Denon multi format DVD/CD player to remove/smooth some of the harshness from the output and does so quite well.