CONDITION

This unit is in excellent condition and works properly. All of the meter lamps illuminate beautifully.

Included accessories: wood case and owner's manual (English, copy).

ABOUT THIS ITEM

The Marantz 170DC is a stereo power amplifier designed in the USA and manufactured in Japan by Marantz, produced from 1977 to 1980 during the golden era of Japanese audio and built to the high standard that made the Marantz name famous. It delivers 86 watts per channel into 8 ohms (108 watts into 4 ohms), and its circuitry was designed specifically to eliminate Transient Intermodulation (TIM) distortion. It uses a completely independent symmetrical layout similar to the Marantz Model 250, with a pure-complementary OCL parallel push-pull three-stage Darlington output in a DC configuration; the first stage is a low-noise dual-FET differential amplifier with a cascode bootstrap circuit that suppresses temperature and time drift in the DC amplifier for stable operation. A large transformer and two 18,800 µF capacitors form a robust power supply, and the protection stage uses the same ESP circuit as the P510M, which instantly detects excessive output current, voltage, or DC at the output terminals to protect both the amplifier and the connected speakers, along with a 4-second delay relay to prevent turn-on shock noise. It features a DC/AC selector switch and large peak-reading power meters with logarithmic compression that read directly from −40 dB to +3 dB with peak indicators. Beautifully built with its classic silver face, the 170DC remains a refined and sought-after vintage power amplifier.

・Power Supply Voltage: AC 100V, 50/60 Hz (Japanese domestic model). Please use a suitable step-down transformer in 110–240V regions.

— Grape Japan