Marantz Model 1070 (1975)

Name: Marantz MODEL 1070
Brand: Marantz

A solid-state stereo console amplifier with independent preamp and power amp sections, sold in Japan for ¥69,900.

Overview

The Marantz Model 1070 is a stereo console amplifier from the mid-1970s. It uses a traditional inverting Darlington circuit. The preamp and power amp sections can run independently. Inputs are phono, mic, and auxiliary. The tone controls include a midrange adjustment and selectable high and low filters. A speaker matrix circuit handles 4-channel operation, and the output transistors are protected by Pulse Energy Protection (PEP).

Specifications

Rated output	40W + 40W (8 Ω, 20 Hz to 20 kHz, both channel drive)
Frequency characteristic	20 Hz to 20 kHz ± 1 dB
Total harmonic distortion factor	0.3% or Less (20 Hz to 20 kHz)
Cross modulation distortion factor	0.3% or Less (20 Hz to 20 kHz)
Damping factor	40 or More (8 Ω Load)
Gain	Phono - Preout:55dB, Phono - Recout:40dB, Highlevel - Preout:15dB
Input impedance	Phono, Mic : 47k Ω, High level : 100k Ω
Input sensitivity	Phono:1.8mV, Aux:180mV
Phono input equivalent noise	1.5 μ V or Less (Input Conversion Value)
Filter	High:10kHz, Low:50Hz
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	190W
External dimensions	Width 360x Height 120x Depth 280 mm
Weight	8.4kg

Design

The tone control section has a midrange adjustment. The speaker matrix circuit allows 4-channel speaker operation. The output transistor protection circuit is PEP (Pulse Energy Protection). Since the preamp and power amp sections work independently, they can be used separately in a larger system.