The D105u is a hybrid CD player: it combines solid-state technology with tube technology. Naturally, the tubes are used only in the analog section, where they handle voltage amplification.

It features a wide range of functions including track memory, random playback, and remote control operation. Its design matches the amplifiers of the same series, with a very square black front panel, an OFF/ON switch at the top left, and horizontally positioned tubes visible through a front glass window.