I now have two matched quads of the Psvane EL34PH tubes and bought a MaxiSwitch II tube tester as well. I tested the two quads and am disappointed with the test results. One quad scored average but the second quad score about 30% lower than the other quad. Here's the rub. Both quads have decently matched sets so they can truthfully claim they are matched sets. But this gives me the conclusion that Psvane does not make consistent quality ranked tubes. Other issues are that the tubes tend to drift a bit on their bias settings and that their sound still sounds thin after a couple hundred hours of use..These tubes are their "premier" EL34 tubes selling about $400/quad. It seems that Psvane is packaging all their EL34PHs that they produce whether they are good or bad. This reinforces my thinking that Chinese manufacturers do not let anything go to waste. For the amount of money you are paying, you should expect better performance.
On the other hand, I have reverted back to the Electro Harmonix 6CA7EH tubes. After breaking them in for a couple of hundred of hours, they have turned out to sound superior to the Psvane EL34PH tubes. I liked them so much, I bought two more quads of the tubes. And here's what I really like about these tubes. All twelve tubes score pretty close to each other, matching close in gain as well. Not only that, once i set the bias on these tubes, they do not drift at all. Finally, all the EH tubes score better when tested than the Psvane with higher gain and Gm scores. To top it off, the Electro Harmonix 6CA7EH tubes are a bargain, $160/quad compared to the Psvane's $400 average price.
On a side note, I have a set of Psvane KT88-T MK II tubes. When tested, they also scored consistently lower compared to other tubes that I own. The KT88s are also supposedly their TOTL tubes and the performance does not match Russian reissued Electro Harmonix or Gold Lion KT88 tubes which are also better matched and higher scoring. This gives me pause when considering buying new tubes from China. I also own a MaxiPreamp II tester and tests bear out the fact as well. My collection of Chinese-made pre-amp tubes perform lower than Russian reissued tubes and a LOT worse than old vintage American-made Sylvania, Tung-Sol and RCA tubes. Caveat Emptor.