My Jackson 648S tester does not seem to test this tube correctly. There are different settings for each side of the triode.
The first test always produces a very low result, in the low 20s on the Jackson scale. The 2nd test produces more expected results. I have tested 3 different pairs of tubes and the results are all similar so I do think it is the setting.
Any one else either have this issue or have a suggestion for the correct "1st test" settings?
