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The sensitivity is not changing when I adjust the sensitivity screw on the 10AU, what can I do?
If you are having trouble adjusting the sensitivity screw (no response), make sure to loosen the sensitivity lock on the front panel of the instrument by using the allen wrench that is stored next to the sensitivity adjustment knob near the power button.  If you have done this and are still having problems, sometimes the polarizer can be slipping on the shaft.  Check the attached diagram to see where to tighten it down if necessary.