Sometimes it's more bother to reverse-engineer than to start-over. Have you been able to get a spot on the screen yet ? You want to make sure the intensity is very low, and unfocused. Once you've got that you might try experimenting with the deflection yoke the see how much drive-current is needed. If you are lucky enough to have 2 audio generators, try driving the horizontal & vertical separately to produce lissajous patterns. We used to do that with TV sets years ago....
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