Why...
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because String width is a very important parameter of pickup design.
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.A traditional Alnico polepiece pickup designed for a wide string width will not perform well when used on an instrument with a narrow string width. And vice-versa, of course.
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..Polepiece designs need to be matched to the string positions that they will sense.
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...Some pickup designs, our 9W's, 59W's and 69W's for example, are very sensitive to
string width.
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....Others, like 9J's, 59J's, 69J's and our new XX's, will cover a wide range of string widths without compromising performance.

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