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Convergence is going to be affected by both the electrostatic convergence plates dimiension and positioning, the dimensions of the tube and the 2nd anode HV potential. The assumption is that the HV is to be 20kV.
Perhaps the HV in this prototype was only 15kV? The HV capacitor voltage rating suggested a lower voltage.
It would be interesting to know at least if static convergence can be achieved with the lower convergence DC potential of the CT-100 with a HV of 15kV.
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