Plectra in Harpsichords
In a harpsichord, there is a separate plectrum for each string. These plectra are very small, often only about a centimeter long, about 1.5 millimeters wide, and half a millimeter thick. The plectrum is gently tapered, being narrowest at the plucking end. The top surface of the plectrum is flat and horizontal, and is held in the tongue of the jack, which permits it to pluck moving upward and pass almost silently past the string moving downward.
In the historical period of harpsichord construction (up to about 1800) plectra were made of sturdy feather quills, usually from crows or ravens. In Italy, some makers (including Bartolomeo Cristofori) used vulture quills. Other Italian harpsichords employed plectra of leather. In late French harpsichords by the great builder Pascal Taskin, peau de buffle, a chamois-like material from the hide of the European bison, was used for plectra to produce a delicate pianissimo.
Modern harpsichords frequently employ plectra made with plastic, specifically the plastic known as acetal. Some plectra are of the homopolymer variety of acetal, sold by DuPont under the name "Delrin", while others are of the copolymer variety, sold by Ticona as "Celcon". Harpsichord technicians and builders generally use the trade names to refer to these materials. In either of its varieties, acetal is far more durable than quill, which cuts down substantially on the time that must be spent in voicing (see below).
A number of contemporary builders and players have reasserted the superiority of bird quill for high-level harpsichords. While the difference in sound between acetal and quill is usually acknowledged to be small, what difference there is, is held to be to the advantage of quill. In addition, quill plectra are observed to fail gradually, giving warning by the diminishing volume; whereas acetal plectra fail suddenly and completely, sometimes in the middle of a performance.
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