Need help on tube identification

[LP Freak]

I’m going though some old tubes and can across some of these. Any ideas?

 

[CDawg]

JJ

 

[LP Freak]

I’ve got 100 preamp tubes sitting here but no labeled JJ’s to compare them to. Now I understand why they test with such high gain

 

[CDawg]

All the JJ ECC83S I've had test high for gain as well. I've noticed the Chinese Genalex 7025s with welded plates, RFTs and the Sovtek WB have more gain than a JJ but that's about it out of all the 12AX7s I've tried.