The Optonica SM-5200 is a stereo integrated amplifier that was part of the Optonica product line, which was produced by Sharp in the late 1970s to early 1980s. It features a robust design with a power output of approximately 60 watts per channel into 8 ohms, making it suitable for driving a variety of speakers. The amplifier includes several input options, such as phono for turntables, tape, and auxiliary inputs, allowing users to connect multiple audio sources. The SM-5200 also offers tone control functions including bass and treble adjustments, as well as a loudness switch for enhanced playback options. Additionally, it is equipped with a headphone jack for private listening. The construction of the unit exemplifies quality, with a sturdy chassis and smooth operational controls, often appreciated by users for its reliability and performance. The design is characterized by a classic aesthetic, featuring black and silver finishes that were popular in audio equipment of that era.