Margules Audio – Tel Rad S.A. is a family-owned company that researches, designs, and manufactures preamplifiers, power amplifiers, and loudspeakers. The origins date back to 1926 when Jacobo Margules founded Emporio Electrico, which later became Casa Margules specializing in electrical components for radio broadcasters, radio amateurs and service technicians. That company then became Radio Surtidora S.A., the oldest company in Mexico. Margules currently specializes in electronic measurement equipment and industrial electronic components. Tel Rad was founded in 1954 as the manufacturing branch for audio components, and for the past 14 years has developed its own technology.