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If you have looked at the under side of your tester, see where this rheostat is wired in. Most generally it is wired in on the primary side of the transformer. If it is then try this, set everything else up on the tester for the tube you want to test. Then put the tube in the correct socket and then center the meter using this rheostat. When the meter is centered and the tube is warmed up press the test lever and read the meter. I do not see any reason they would have this adjustment made before the tube was installed. But if I knew everything I would be making a lot more money than I am! If you can post a couple of pictures of this treasure you have. You do have a piece of history!
Terry
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