1984 D-50
The D-50 is Sony's first portable CD player, released in 1984.
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The D-55T is a portable CD player with a built-in AM/FM tuner. It features a tuner that supports television audio frequencies and utilizes the headphone cable as an antenna. It also supports mono/stereo switching and local/long-distance reception settings. The CD playback section inherits the configuration of the early Discman series and does not have a vibration-resistant mechanism. It is intended for use as a multi-function device, including the tuner, and is configured to support multiple audio sources for portable use.