1984 D-50
The D-50 is Sony's first portable CD player, released in 1984.
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The D-50MkII is an improved model based on the original D-50, with a revised power supply system and internal design. It features a structure that tightly integrates the dedicated rechargeable battery into the main unit, enhancing the overall unity of the power supply. While the internal transport and digital circuits have also been updated, the playback system itself maintains the same configuration. It lacks vibration damping mechanisms, and its basic operating characteristics are the same as the original model. Although designed for portable use, it is intended for use in a stable installation environment. This model streamlines the configuration of early portable CD players.