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Anything is possible, but there is no real way that it could be arcing inside the tube, unless there is air or foreign matter in there.
Does the speed of the arcing sound change if you make the picture roll fast with the Vertical Hold pot; and does it stop if you throw the service switch? If so, I bet you're hearing the pulsing of the yoke, which has fooled me a couple times. It is a muffled arcing sound, like what you would perceive an HV arc to sound like through the glass.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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