6DJ8 measurement error on Hickok 600A

Thank your for your reply Jea48. I did set the tester as you mentioned. I still get about 7000 reading on new tubes (should be around 9250).

I found it is hard to get repeatable readings for 6dj8 tube. When I use 15000 scale, the reading is too sensitive to English position. Every step represent about 500 on the reading. I don't know if I have a bad English.
I am still confusing about 6922 vs 6dj8. I can get over 10000 reading for some 6922 tube.

Hi Jim, Which setting should I use for Telefunken E88CC tube? 6922 or 5DJ8. Thank you.

Thank you for all your replies. The problem is solved by replacing 600A with 539B. All the readings on 539B are reasonable and repeatable. I really like 539B a lot. it is much better than 600A. I think 600A may not have the high current capability to test 6DJ8/6922 type tube reliably.