The Sony TC-138 SD is a solid-state reel-to-reel tape recorder that has garnered interest from audiophiles and collectors. It features a compact design suitable for home and professional use, capable of recording and playback at various tape speeds, typically 3.75 and 7.5 inches per second. The machine supports both quarter-inch tape formats and utilizes a direct drive motor system, which enhances its reliability and reduces wow and flutter. The TC-138 SD has a built-in playback equalizer and offers balanced and unbalanced input options, allowing connectivity with a range of audio sources. It also includes features such as automatic stop/rewind functionalities for ease of use and manual controls for those seeking more hands-on operation. Typical specifications include a frequency response of 30 Hz to 20 kHz at 7.5 ips, a signal-to-noise ratio around 50 dB, and relatively low harmonic distortion levels, making it a practical choice for those interested in tape recording. Overall, the TC-138 SD reflects a blend of quality engineering and user-friendly design.
