The Sanyo RD-3510 is a cassette tape deck that was part of the Sanyo System 3510, which was produced between 1979 and 1981 in Japan. This model is recognized for its functionality within the complete audio system, which included various components like an integrated amplifier, turntable, and tuner. The system had an original price of approximately 1,498 DM. The RD-3510 features capabilities for high-quality playback and recording of audio cassettes, making it a versatile device for music enthusiasts during its time. It is often paired with other components from the Sanyo System series such as the Sanyo DCA-3510 amplifier and Sanyo FMT-3510 tuner to form a complete audio setup.