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• 12:25, 12 February 2024 Bo talk contribs created page File:17 TQD56 Trimmer A 20240212.jpg (* Warning! * Do not touch or bend the two red wires with open ends that seems oddly forgotten. * They are part of a trim capacitor that are used to compensate for the Time Base Amplifiers frequency response. One pair at the upper board and one pair at the lower board. If you change the tube to an other manufacturer, it may be needed to adjust (bend) a little. Nothing is mentioned in the D55A manual what I could find.)