Electro String also sold amplifiers to go with their guitars. A Los Angeles radio manufacturer named Van Nest designed the first Electro String production-model amplifier. Shortly thereafter, design engineer Ralph Robertson further developed the amplifiers, and by the 1940s at least four different Rickenbacker models were available. James B. Lansing of the Lansing Manufacturing Company designed the speaker in the Rickenbacker professional model. During the early 1940s, Rickenbacker amps were sometimes repaired by Leo Fender, whose repair shop evolved into the Fender Electric Instrument Manufacturing Company.
Electro String also sold amplifiers to go with their guitars. A Los Angeles radio manufacturer named Van Nest designed the first Electro String production-model amplifier. Shortly thereafter, design engineer Ralph Robertson further developed the amplifiers, and by the 1940s at least four different Rickenbacker models were available. James B. Lansing of the Lansing Manufacturing Company designed the speaker in the Rickenbacker professional model. During the early 1940s, Rickenbacker amps were sometimes repaired by Leo Fender, whose repair shop evolved into the Fender Electric Instrument Manufacturing Company.