The Optonica SM-3636 is a stereo integrated amplifier that was produced during the late 1970s and early 1980s. It features a solid build quality and a classic aesthetic design that incorporates channel separation and well-defined volume controls. The amplifier offers a power output of approximately 50 watts per channel into 8 ohms, which is suitable for driving a variety of speaker types. The SM-3636 includes a range of input selections, such as phono, auxiliary, and tape, allowing it to accommodate different audio sources. It also features tone controls for bass and treble adjustments, as well as balance control to manage the sound distribution between channels. The unit is often praised for its warm sound signature, providing an enjoyable listening experience. Additionally, the SM-3636 was designed with a high-quality internal circuit layout to minimize noise and interference, which enhances the overall audio performance.