Using non-ferrous bronze strings on an acoustic guitar how does a magnetic pickup in the sound hole or under the strings pick up the string vibration?
The wound strings used for acoustic guitar are usually made of bronze or other non-ferrous alloy. When using magnetic pickups under the strings the portion of the string that disturbs the magnetic field is the ferrous inner core of the string. The inner core is normally made from a ferrous material commonly called spring steel or music wire. A ferrous material is one that is attracted or attracts a magnetic field. The plain E-1st and B-2nd strings are spring steel with no wrapping. The same spring steel can be wrapped with ferrous or non-ferrous alloys for different gauges and tension. A string can be made with a thinner inner core and larger diameter wrapping or a thicker inner core and thinner wrapping or both. If you unwrap the outer wrappings of a bronze string you will see the inner core is most likely made of spring steel. The outer wrappings can be made with numerous diameters to increase or decrease the total diameter or gauge of string. I ve unwrapped acoustic strings to deter
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