Requinto was 19th century Spanish for "little clarinet". Today, the word requinto, when used in relation to a clarinet, refers to the E-flat clarinet, also known as requint in Valencian language.
See Also: Requinto Guitar
The requinto guitar has six nylon strings with a scale length of 530 to 540 millimetres (20.9 to 21.3 in), which is about 18% smaller than a standard guitar scale. Requintos are tuned: A2-D3-G3-C4-E4-A4 (one fourth higher than the standard classical guitar).
Requintos made in Mexico have a deeper body than a standard classical guitar (110 millimetres (4.3 in) as opposed to 105 millimetres (4.1 in)). Requintos made in Spain tend to be of the same depth as the standard classical.
Other stringed instruments
Many Portuguese violas, such as the Viola braguesa, have smaller requinto versions also, called 'requinta'. The Viola Braguesa Requinta is tuned: A4 A3, C5 C4, F5 F4, C#5 C#5, E5 E5.  This tuning is a fifth above the standard Viola braguesa. 
Puerto Rican Tiples
In Puerto Rico, there are many small instruments called Tiple Requinto. These usually have 3 or 4 strings. See Tiple (Puerto Rico).
Columbian Tiple Requinto
The Colombian Requinto Tiple (or Tiple Colombiano Requinto) is smaller than a standard Tiple Colombiano, and is sometimes shaped more like a violin or Puerto Rican cuatro, or sometimes like a small guitar (smaller than the standard Tiple). It also has 12 strings and is also triple-strung, but the higher pitch means that all of the strings in the courses are tuned to unison. It is tuned D4 D4 D4, G4 G4 G4, B4 B4 B4, E4 E4 E4.
The requinto is used in conjunto jarocho ensembles. In the absence of the arpa, the requinto typically introduces the melodic theme of the son and then continues by providing a largely improvised counterpoint to the vocal line. See Requinto jarocho.
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