How do I align my meter on my TLA-50?

Sometimes the meter can drift on the TLA-50. Fortunately, it is very easy to align. Warm the unit up to the operating temperature. Make sure there is nothing plugged into the input or output. Looking down through the top slats on the TLA-50, find the blue trim pot in the far back left corner, marked R128 (you may need a flashlight). Ease a small, flathead screwdriver between the slats into the trim pot. Set the meter select switch to "red." (reduction). Turn the trim pot until the meter rests at 0. Flip the meter select switch back to output, then back to reduction and adjust again. Do this several times until the meter consistently sits at 0.