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I am trying to calibrate Stark 9-66A tube tester and have a problem. Instructions specify to measure voltage of 20 VAC when P4 button is pushed and 0 VAC when P6 is pushed. I have the opposite readings, 0V when P4 is pushed and close to 20 VAC when P6 is pushed.Can anyone help? DC readings at P4 are close to 220V as specified by instructions. Calibration instructions are attached.Thanks in advance.
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