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Most of the early U92 chassis sets had no horizontal centering controls. Magnavox did provide on some of them a terminal strip that had a diode and resistor with two blue wires with push on connectors that would move the picture about one inch left or right depending on how you plugged the wires on. This was later replaced with an actual control with two diodes that worked as a normal centering control. I've added this simple circuit to several chassis over the years.
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