12AX7/LPS Sovtek - I am very confused, please help

I just purchased a brand new 12AX7. I tested it on some of my emission type tube testers I have, namely:
B&K 606
Sencore; TC-28, TC-162
Eico 625

testing this tube makes the needle move 1/4" off zero, some make the needle go to the middle of the "replace" and then drops down to about 20.

This is a brand new Russian Sovtek 12AX7/LPS, I find it hard to believe it's bad.

I tested a 12AX7 from 1969 and it read very good on all my testers.

I contacted the merchant that sold it to me and he gave me a very long winded story about what is good and bad and he tests them on a Hickok and was leading me to believe all my "emission" tube testers were not checking it correctly.

I told him I can't understand why I can't use a vintage emission tube tester to check this NEW 12AX7.

Is he right? or is the tube very very weak?

Please help me with this.

Thanking in advance.

-TommyR