The Sphärophon is an electrical musical instrument that was first made as the "Electrophon" around 1921 by Jörg Mager, later modified, renamed and exhibited in 1926.Mager invented two different variants of the Sphärophon. The first version was similar to a Theremin, but Mager's design had the capability to change the timbre of the sound that was produced as well as utilize discrete pitches. His second prototype was keyboard-based but used a radio frequency oscillator as well. This instrument was capable of producing quarter tones of an octave. In many of his instruments, including the Spharophon, Mager experimented with the drivers in the loudspeakers to achieve different sounds as well.
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