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Current limiting by more series resistance can only lower the voltage on the convergence grid. If a higher voltage produced better convergence, then you need less series resistance.
I think the problem with the test you did is that the convergence grid draws too much current when convergence is right, and that current is too much for the 19.5 kv supply to handle. I don't think returning the bottom end of the convergence pot will help. I think the only solution is a beefier HV supply.
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