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I always use a test pattern DVD with solid field patterns of each primary. That way I don't need to touch the screens or pierce the CRT socket leads. I've got test equipment which can pierce the leads for connection too, but have never used that part of it because I don't the potential arcing and shorting hazards that will be with the set after piercing the leads(I also don't like the idea of damaging the insulation of wires I plan to keep even if there is a purpose to it).
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