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Dark patches on the screen from poor HV filtering and or noise on screen....Also rarely does a significant portion of the dag come off without "islands" forming, and the islands tend to arc to each other/other dag and grounds which may cause implosion....So far (knock on wood) I can't say I've seen a set with more than %10 (the most I'll tolerate before wanting to recoat) bad or lost dag. If dag damage ain't bad I eradicate dag islands and move on with my life.
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