They had metal bodies and a tricone resonator system, with three aluminium cones joined by a T-shaped aluminium spider.īrother Rudolph Dopyera, who previously worked with Weissenborne, hand built the original tri-cone models with diamond holes, prior to the second production stamped metal bodies by engineer Adolph Rickenbacher. In 1927, National produced the first resonator instruments and sold them under their National brand. This guitar, #101 was later modified with a mahogany Spanish neck for regular guitar playing.īeauchamp had suggested to Dopyera the need for a guitar loud enough to play a melody over brass and other wind instruments. Soon afterwards the first German silver Hawaiian guitar was built by John and Rudolph Dopyera.
They first experimented with their novel ampli-phonic design in a large walnut console instrument. He used that initial idea, but with a large spun conical inverted speaker to create his patented multiple resonator designs.ĭopyera was assisted with his nephews Paul and Carl Barth spinning the first aluminum diaphragms on wooden bucks. The second company was formed by George Beauchamp, a vaudeville steel guitar player and house painter, and inventor John Dopyera, a violinist and luthier).ĭopyera had seen an amplified Stroh stick violin nearby with a small flat diaphragm and long attached horn. 1930 National Triolian resonator mandolin
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