Marantz Model 170DC

Commentary

With the theme of eliminating TIM (transient intermodulation distortion), this is a stereo power amplifier refined from Marantz's tradition with the latest technology.

It has a fully independent symmetrical layout like the model250. It has a pure complimentary service OCL parallel push-pull 3-stage Darlington circuit with a DC-configuration. It is also designed to be resistant to load resistance and superior in power linearity by using a specially designed low-noise element.
In addition, a differential amplification cascode bootstrap circuit using audio specification low-noise dual FET is adopted in the first stage to minimize the problem of temperature drift and time drift in the DC amplifier and realize stable DC.

A large transformer and a 18,800 μ Fx2 large capacitor are used for the power supply.

The ESP circuit adopted in the P510M is mounted in the protection circuit.
This circuit instantaneously detects excessive output current or voltage or DC generation at the output terminal, and limits the signal to the driver transistor to a safe value. It also detects the frequency and time. It also detects the value of the total energy, so it protects the program without intermediate steps.
It is also equipped with a relay a relay with a delay circuit (4 seconds) to prevent shock noise caused by power ON, and automatically separates and protects the speakers.

Equipped with a large power meter.
Unlike other VU meters, this meter can monitor the peak output level of the left and right channels, and can read directly in the range of -40dB to + 3 dB by using logarithmic compression.

Equipped with a peak indicator for easy level adjustment.

The DC/AC change-over switch is installed on the Model170DC to solve the problem of DC leakage of the preamp to be combined with the DC power amplifier.

The wood case was sold separately as an option.
You can choose the finish of the exterior of this wood case, and there are 2 kinds of variations, walnut and mahogany.

Model Rating

Type	Stereo power amplifier
Rated Output (20 Hz to 20 kHz, Both Channel Drive)	110W + 110W (4 Ω) 90W + 90W (8 Ω)
Total harmonic distortion factor	0.03%
Cross modulation distortion factor	0.03%
Frequency characteristic	20 Hz ~ 20 kHz + 0 -0.2 dB
Input Sensitivity / Impedance	1.5V/30k Ω
Residual noise (IHF-A)	0.046mV
Damping factor	60
Power consumption	225W (Electrical Appliance and Material Control Law) 490W maximum
External dimensions	Width 416x Height 146x Depth 301 mm
Weight	14.1kg
Sold Separately	Wood Case WC-110 (Walnut Finish, ¥ 7,000) Wood Case WC-110N (Mahogany Finish, ¥ 12,000)