The hor. 'efficiency' coil usually goes 'Slinky' before those convergence coils do. It may have already done so and been replaced. In any case, you gotta verify that it's intact and that the form shows no sign of crystalizing. It's finely tuned for a resonant dip of the H output cathode current. If the coil loses resonance, the K current skyrockets, risking red plating the tube.
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