That's funny because if you compare a Valve Art 274B and Chinese 5U4G side by side the innards are identical. However, if it works for you that is fine.

I would caution you on the Pissvane tubes. They are more hype than anything else. I doubt they would sound better than what you have. It is basically a Shuguang made rectifier with ostentatious packaging and ludicrous claims made about it.

As to Western Electric replicas and mesh plates get ready to drop major dollars on what may prove to be overkill.

If you are happy, I am happy.

I just hope that the original poster does not go hog wild buying fancy crap that won't sound better than what he has now.

Like RR, though perhaps a tad less curmudgeonly,  I would caution against jumping in on exotic expensive tubes too quickly, especially at the rectifier. I have spent a fair bit of coin on a lot of NOS, as well as some high priced, and not-so-expensive current models. In the rectifier tubes, I have been consistently pleased with a number of NOS RCA tubes; just bought a couple from 1943 from a fellow Decwarian. At the recommendation of many here, I am trying the Shuguang Preferred 274B. Thought about the Valve Art, but it did not seem different enough to merit that one as well. I also looked at the Sophia [really pretty tube], and the Psvane WE274B 1:1 replica. The Sophia has generated some very positive reviews, and it's not difficult to find hype around some of the expensive Shuguang and Psvane. I just bought a T-II set of the Psvane 6CA7, and will probably start listening to them in my front Torii this weekend. I was pleased enough with the Black Treasures to try the new Psvanes, but at the end of the day, I will—if reports here are any guide—return to the cryo JJs, which are patiently waiting in the cabinet. Unless the new Psvanes are so resoundingly better than the JJs—I have the luxury of having two different Torii amps, and an Ultra preamp in a multi-ERR setup that lets me actually listen to and compare different tubes in very similar setups. Not exactly true A/B/X, but much more effective comparison than swapping tubes. If I don't hear a big diff, this will be a pretty easy decision. But if the difference is noticeable, well then, the improvement in the music may make the investment worthwhile.

For me, that's the issue. The real problem with the exotic tubes, and the NOS hunt, is that eventually, tubes expire or fail. The ROI on a set of Treasures or Psvanes, can be emotionally high, but if you listen a lot, you can burn through the tubes very quickly. And replacing them with like can get very expensive.

Moreover, it can be difficult to audition the tubes in any other way except for buying them, burning them in, and listening on your own equipment. At the end of the day, you might well convince yourself that you are hearing what the seller and reviewers told you were supposed to hear. And if you don't, well then what?

Valve Art 274B is the export brand of Shuguang. The Tube Store 274B preferred is probably rigorously tested and tubes that don't make the grade are culled.

There are good sounding tubes coming from China. Too early to tell about longevity though. You need to get them from a dealer that does thorough testing, it's worth the extra money.

The Psvane WE replica 274B appears to be a different tube than the Shuggie. Here is a review from someone in Holland that I know and trust.

http://psvanetube.com/wordpress/lets-hear-what-the-pros-say-about-we274b-we205d-...