- Some visible scratches and cosmetic imperfections. - In good working condition Product description: The Marantz 170DC is a 85Watt output at .03% THD+N non conventional amplifier in a sense of its design. The 170DC is a true DC designation versus the typical DC coupled nomenclature units as it amplifies input DC thru out the gain stages. A trait some would say, such as Marantz, is perfect for the naturally chaotic or asymmetric nature of  recorded music versus a typical reference sine wave. Produced during the late 70’s from 1978 to 1980 it boast a unique meter design compared to the popular 250 series with extended bezel and silver patina. What I admire about the 170DC is its truly simplistic design and quality build.