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A resonator mandolin or "resophonic mandolin" is a mandolin whose sound is produced by one or more metal cones ( resonators ) instead of the customary wooden soundboard (mandolin top/face). These instruments are sometimes referred to as "Dobro mandolins," after pioneering instruments designed and produced by the Dopyera Brothers, which evolved into a brand name. The trademark "Dobro" is currently the property of the Gibson Guitar Corporation. When Gibson acquired the trademark in 1993, they announced that they would defend their right to its exclusive use.
The resonator mandolin was developed in parallel with the resonator guitar. The resonator guitar was originally designed to be louder than conventional acoustic guitars. A resonator mandolin is generally somewhat louder than a standard wooden mandolin, and has a different tone quality and distinctive appearance.
Though resonator guitars are often played flat in the lap steel guitar style, resonator mandolins are almost exclusively played in the conventional manner.
The resonator mandolin was developed by John Dopyera, who sought to produce a guitar that would have sufficient volume to be heard alongside brass and reed instruments. In 1927, Dopyera and George D. Beauchamp formed the National String Instrument Corporation to manufacture resonator guitars under the brand name National, adding tenor guitars, resonator mandolins and resonator ukuleles to their product line within a year.
National mandolins were produced until 1941. The company also made resophonic mandolins sold under the Supro brand.
In 1929, Dopyera left National to form the Dobro Manufacturing Company with his brothers Rudy, Emile, Robert and Louis, Dobro being a contraction of "Dopyera Brothers" and coincidentally meaning "good" in their native Slovak language. This company primarily produced guitars, but also produced resonator mandolins and resonator ukuleles that employed a cone-and-spider resonator rather different from the one- and three-cone components of the Nationals. Dobro Manufacturing Company licensed designs and supplied trademarks and parts to a series of vendors such as Kay-Kraft, Harmony (Sears) and Regal. George D. Beauchamp retained control of the National String Instrument Corporation. The two companies clashed in court from 1931 until 1935, when the Dopyeras prevailed and the National-Dobro Corporation was formed. The company moved to Chicago in 1936–37.
Mandolins sold under the Dobro brand had wooden bodies. Mandolins sold under the National brand had metal bodies. Production of all metal-bodied resonator instruments ceased following the US entry into the Second World War in 1941.
Rudy Dopyera in particular continued to build instruments on his own throughout his lifetime, into the 1980s. He produced a few resophonic mandolins under the Safari brand name.
Some inexpensive mandolins sold during the 1930s and 1940s had a wooden top with a resonator cover plate screwed to it. These instruments had no resonator cone, nor did they have a hole cut for one. The cover plate served only as a decoration.
Blue Comet is an inexpensive 1930s brand of mandolin manufactured by the Regal Musical Instrument Company in Chicago, Il that featured an extra wooden sound chamber encircling the body. Somewhat resembling a banjo tone ring, this chamber contained several small soundholes with metal screen covers. While the sound chamber may indeed affect the tone or volume of the mandolin, Blue Comets do not contain resonator cones and are not truly resophonic. They are usually dark brown with F holes. Similar mandolins were sold under the Beltone brand and a couple of other brand names.
Although the original aim of the resonator was increased volume, some modern instruments incorporate electric pickups, and players add pickups to non-electric instruments, and use the resonator purely for its distinctive tone.
In 1938 and 1939, National made a limited number of "Silvo" electrics using the same triangular metal body as the Style 1 resophonic mandolin. The Silvo pickup was housed in a bakelite disc that replaced the cover plate. However, since Silvos do not have a resonator cone, they are electric but not truly resolectric.
The guitar is a fretted musical instrument that typically has six strings. It is usually held flat against the player's body and played by strumming or plucking the strings with the dominant hand, while simultaneously pressing selected strings against frets with the fingers of the opposite hand. A plectrum or individual finger picks may also be used to strike the strings. The sound of the guitar is projected either acoustically, by means of a resonant chamber on the instrument, or amplified by an electronic pickup and an amplifier.
Rickenbacker International Corporation is a string instrument manufacturer based in Santa Ana, California. The company is credited as the first known maker of electric guitars – a steel guitar in 1932 – and today produces a range of electric guitars and basses.
Dobro is an American brand of resonator guitars, currently owned by Gibson and manufactured by its subsidiary Epiphone. The term "dobro" is also used as a generic term for any wood-bodied, single-cone resonator guitar.
The acoustic bass guitar is a bass instrument with a hollow wooden body similar to, though usually larger than a steel-string acoustic guitar. Like the traditional electric bass guitar and the double bass, the acoustic bass guitar commonly has four strings, which are normally tuned E-A-D-G, an octave below the lowest four strings of the 6-string guitar, which is the same tuning pitch as an electric bass guitar.
The Ovation Guitar Company is a manufacturer of string instruments. Ovation primarily manufactures steel-string acoustic guitars and nylon-string guitars, often with pickups for electric amplification. In 2015, it became a subsidiary of Drum Workshop after being acquired from KMCMusicorp.
Dean Guitars, commonly referred to simply as Dean, is an American importer and maker of stringed instruments and musical products with its headquarters in Tampa, Florida.
Washburn Guitars is an American brand and importer of guitars, mandolins, and other string instruments, originally established in 1883 in Chicago, Illinois. The Washburn name is controlled by U.S. Music Corp., a subsidiary of Canadian corporate group Exertis|JAM.
The tenor guitar or four-string guitar is a slightly smaller, four-string relative of the steel-string acoustic guitar or electric guitar. The instrument was initially developed in its acoustic form by Gibson and C.F. Martin so that players of the four-string tenor banjo could double on guitar.
John Dopyera was a Slovak-American inventor and entrepreneur, and a maker of stringed instruments. His inventions include the resonator guitar and important contributions in the early development of the electric guitar.
A resonator guitar or resophonic guitar is an acoustic guitar that produces sound by conducting string vibrations through the bridge to one or more spun metal cones (resonators), instead of to the guitar's sounding board (top). Resonator guitars were originally designed to be louder than regular acoustic guitars, which were overwhelmed by horns and percussion instruments in dance orchestras. They became prized for their distinctive tone, however, and found life with bluegrass music and the blues well after electric amplification solved the problem of inadequate volume.
The National String Instrument Corporation was an American guitar company first formed to manufacture banjos and then the original resonator guitars. National also produced resonator ukuleles and resonator mandolins. The company merged with Dobro to form the "National Dobro Company", then becoming a brand of Valco until it closed in 1968.
The Regal Musical Instrument Company is a former US musical instruments company and current brand owned by different companies through the ages. By the 1930s, Regal was one of the largest manufacturers in the world.
Original is an American brand currently owned by Gibson through its subsidiary Epiphone. The company uses the brand to produce and commercialize resonator guitars.
National Reso-Phonic Guitars is a manufacturer of resonator guitars and other resonator instruments including resonator mandolins, tenor instruments, and resonator ukuleles.
Kay Musical Instrument Company was an American musical instrument manufacturer established in 1931 by namesake Henry "Kay" Kuhrmeyer and based in Chicago, Illinois. It was formed when Kuhrmeyer bought out his financial backers in the instrument manufacturer Stromberg-Voisinet. They produced guitars, mandolins, banjos, ukuleles and were known for their use of lamination in the construction of arched top instruments.
The Rickenbacker Electro A-22, nicknamed the "Frying Pan" is the first electric lap steel guitar. Developed in 1931/1932, it received its patent in August 1937. A previous attempt, the Stromberg company‘s transducer-based "Stromberg Electro", was introduced in 1928. It used a "vibration-transfer rod" from the instrument's sounding board attached to magnets inside the guitar, and was not successful. George Beauchamp created the "Fry-Pan" in 1931, and it was subsequently manufactured by Rickenbacker Electro. The instrument gained its nickname because its circular body and long neck make it resemble a frying pan.
Valco was a US manufacturer of guitar amplifiers from the 1940s through 1968.
Elderly Instruments is a musical instrument retailer in Lansing, Michigan, United States, with a reputation as a "megastore", a repair shop and a locus for folk music including bluegrass and "twang". Specializing in fretted instruments, including acoustic and electric guitars, banjos, mandolins, and ukuleles, Elderly maintains a selection of odd or rare instruments. Elderly is known as a premier repair shop for fretted instruments, as one of the larger vintage instrument dealers in the United States, and as a major dealer of Martin guitars in particular.
A resonator ukulele or "resophonic ukulele" is a ukulele whose sound is produced by one or more spun aluminum cones (resonators) instead of the wooden soundboard. These instruments are sometimes referred to as "Dobro ukuleles," however the term "Dobro" is currently trademarked by the Gibson Guitar Corporation.
Tone Poems 3 is an album by mandolinist David Grisman, dobro player Mike Auldridge, and guitarist Bob Brozman that was released in 2000 by Grisman's label, Acoustic Disc. The album is a sequel to Grisman's albums Tone Poems and Tone Poems 2, which were recorded with Tony Rice and Martin Taylor, respectively. The trio plays vintage slide and resophonic instruments such as the Dobro and resonator guitar. The songs cover many genres: Hawaiian, blues, country, bluegrass, and jazz.