The Sony TC-K 661 S is a dual cassette deck that was part of Sony's lineup during the 1980s. It features a sturdy build with a sleek design typical of its era and is aimed at audio enthusiasts who appreciate cassette tapes. The deck includes a number of advanced features such as Dolby B and C noise reduction for improved audio clarity and enhanced tape performance. It supports various tape types, including standard chromium and metal tapes, which allows for greater flexibility in recording and playback. The TC-K 661 S is equipped with direct drive motors for precise tape handling and consistent performance. Other notable features include auto reverse functionality, allowing for uninterrupted listening, and a well-designed user interface with function buttons and a display for easy navigation. This model has a reputation for good sound quality, especially when used with high-quality tapes, and is compatible with a wide range of audio equipment. The dimensions are typical for a cassette deck, measuring 430 mm in width, which allows it to fit into standard audio racks. Overall, the TC-K 661 S is a solid choice for those who still enjoy the analog cassette format and seek quality performance in their playback and recording.