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The first commercially successful type of electrical phonograph pickup was introduced in 1925. Although electromagnetic, its resemblance to later magnetic cartridges is remote: it employed a bulky horseshoe magnet and used the same single-use steel needles which had been standard since the first mechanical transfer disc record players appeared in the 1890s.
The P-90 is a single coil pickup designed by the Gibson Guitar Corporation. [4] [5] These pickups have a large, flat coil with adjustable steel screws as pole pieces, and a pair of flat alnico bar magnets lying under the coil bobbin. The adjustable pole pieces pick up the magnetism from the magnets.
A typical magnetic pickup is a transducer (specifically a variable reluctance sensor) that consists of one or more permanent magnets (usually alnico or ferrite) wrapped with a coil of several thousand turns of fine enameled copper coil. The magnet creates a magnetic field which is focused by the pickup's pole piece or pieces. [2]
A tubular lock and key. A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or the trademark Ace lock popularized by manufacturer Chicago Lock Company since 1933, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape.
The resulting inconsistency in turn count led to variation in the output and tone. For the same reason, the two coils within each pickup unit usually have a slightly different number of turns, which affects the treble overtones of the assembled pickup. Gibson used Alnico magnets in PAFs, the same magnet as used in the P-90. Alnico has several ...
A switchable magnetic device usually consists of a magnetic circuit with permanent magnets. By moving some parts of this circuit, the magnetic flux can be directed within the device (off position) or externally (on position). [3] One type of magnetic switchable device is made from two blocks of iron, with a round cavity bored through the center.