Electric mandolin 4-string version. A related instrument, the Bahian guitar, was developed in Brazil beginning in the 1940s. Bahian guitars typically have a solid body and 4 or 5 single-course strings tuned in fifths, but are considered to be electric versions of the cavaquinho rather than the mandolin. Both four string single course and eight string double course solid body mandolins have been produced by several makers, as well as five string single course models. From 1956 to 1976, Fender produced a four string version which they simply called the "Fender Electric Mandolin". Its body shape was based on a smaller version
Mandolin that used steel or steel-and-bronze strings. Pasquale Vinaccia (1806–c. 1882), modernized the mandolin, adding features, creating the "Neapolitan" mandolin c. 1835. Pasquale remodeled, raised and extended the fingerboard to 17 frets, introduced stronger wire strings made of high-tension steel and substituted a machine head for the friction tuning pegs, then standard. The new wire strings required that he strengthen the mandolin's body, and he deepened the mandolin's bowl, giving the tonal quality more resonance. He didn't introduce the bent soundboard, as it was present in some of the instruments made by the previous generation for bronze strings. Other luthiers who