Check out Ram Tubes they do extensive testing, it was Roger Modjesky of Music Reference's tube company. The EL34s I bought recently were chinese and have worked out well
Do you Know a Trusted Seller of Chinese Vacuum Tubes?
With the terrible Russian offensive/war and the drying up of NOS tubes, I ventured more deeply into Chinese tubes.
Does anyone have a recommended seller who might actually test for noise/microphonics? I wish Kevin Deal's outfit would start carrying some of the premium offerings. I'm surprised he doesn't given (I think) Primaluna branded tubes are likely Chinese (Shuguang, maybe?).
Some of the Chinese preamp tubes I've tried sound glorious. Getting them without noise can be a challenge.