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purity coil

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purity coil [′pyu̇r·əd·ē ‚kȯil]
(electronics)
A coil mounted on the neck of a color picture tube, used to produce the magnetic field needed for adjusting color purity; the direct current through the coil is adjusted to a value that makes the magnetic field orient the three individual electron beams so each strikes only its assigned color of phosphor dots.


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Separate purity coils for each of the four corners of the screen, which helps to ensure accurate color from edge to edge.
Separate purity coils for each of the four corners of the screen, which helps to ensure accurate color from edge to edge.
 
 
 
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