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:
Sencore; TC-28, TC-162
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.