Regarding the post you commented on.....Yeah Russian Sovtek 12AX7WC look nothing at all like Chinese Groove Tubes 12AX7-C or Shuguang 12ax7B.......... they are not the same Tube, they are made in different factories and countries to completely different specs and dude is either misinformed or just doesn't know
While yeah there are rebranding such as Groove Tubes or Tube Amp Doctor or Dougs Tubes it's not simply just relabled stuff and well the screening and grading process seperates most of the good tubes from everything else everyone else gets......
Relabled or not the thing is they aren't all the same thing especially when they are made from a different factory nevermind in a different country. Even within a factory you have seperate tubes being made to different standards and specs.
For example a Sovtek LPS and 12AX7 TungSol RI are made in the same factory and the same country yet look nothing alike, sound nothing alike and are made nothing alike.......
Additionally you also do have tubes being made that aren't just relabled but that are in fact made differently and constructed to different specs and standards such as some by Tube Amp Doctor or PM tubes, Genalix...... yeah "relabled"...... but made to the customers/brands specs and standards.
If you think all current production tubes are the same buy ungraded tubes right or just buy the cheapest JJ or cheapest Sovtek or Chinese tubes...... by this logic they are all the same shit anyways so who cares no