P-90
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The P-90 is a single-coil electric guitar pickup produced by Gibson Guitar Corporation since 1946, as well as other vendors. Compared to other single coil designs, such as the Fender single coil, the
Epiphone Casino P90
Gibson P-90 soap bar
P-90 dog ear
Alnico
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Alnico is a family of iron alloys which, in addition to iron, are composed primarily of aluminium, nickel, and cobalt, hence the acronym al-ni-co. They also include copper, and sometimes titanium. Aln
P-90
…featured a variant of the P-90 pickup called the P-90S, inspired by the original pickup of the Gibson ES-125. This variant possesses six rectangular Alnico-slug-pole-pieces with no individual height-adjustment. There are three major varieties of P-90 casing…
A "horseshoe magnet" made of Alnico 5, about 1 inch high. The metal bar (bottom) is a keeper, which is placed across the poles when the magnet is not in use. This helps to preserve the magnetization.
Alnico 5 magnet used in a magnetron tube in an early microwave oven. About 3 in (8 cm) long.
Advertisement by Jensen Radio Manufacturing Co. for Alnico 5 loudspeakers in 1945. As illustrated, Alnico 5 allowed a dramatic reduction in size and weight of magnet needed to produce a given flux, from 90 oz in 1930 to 4.6 oz.
Assortment of alnico magnets in 1956. Alnico 5, developed during World War 2, led to a new generation of compact permanent magnet motors and loudspeakers.