1992 D-T115
The D-T115 is a portable CD player with a built-in AM/FM tuner.
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The D-T405 wrapped up the tuner-equipped branch in a very late-period form, combining ESP buffering and a compact late-generation body with built-in FM radio focused almost entirely on convenience. It was not trying to reinvent the hybrid idea, just deliver one more sensible version of it once the basic formula had already been refined.
That makes it a fitting late model. The D-T405 is part of the end of the tuner Discman line not because it does anything radical, but because it no longer needed to. It simply carries the branch to its natural conclusion.