The Sony TC-K15 is a cassette deck that was part of Sony's lineup in the late 1970s and early 1980s. It features a 2-head design, with one head for recording/playing and another for erasing. The deck is equipped with Dolby B noise reduction to reduce hiss on tapes, and it also has a metal tape capability, which allows it to record on higher-quality metal cassette tapes for improved audio fidelity. The TC-K15 supports three tape types (I, II, and IV) and offers manual calibration options for both recording level and bias, enabling users to optimize the recording quality for different types of tape.