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Your arcing may be caused by a defective doorknob capacitor in the high voltage cage.
Also check the high voltage lead going to the rim of the picture tube for cracks in the insulation.
The width control effects the brightness and arcing because its adjusting the screen voltage to the horizontal amplifier tube. Lower the voltage on the screen and you get a slightly dimmer, thinner picture with less high voltage.
I STRONGLY recommend you replace all of the paper and electrolytic capacitors. You need to be sure the electronics are up to snuff before you do any serious troubleshooting of the HV and sweep sections.
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Jordan
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