McIntosh MR 71 User Manual

FM STEREO
TUNER MR 71
CONTENTS
TABLE OF CONTENTS
OWNER'S MANUAL
INTRODUCTION
TECHNICAL DESCRIPTION
FRONT PANEL INFORMATION
BACK PANEL INFORMATION
INSTALLATION
CONNECTING
Audio Outputs
Stereophonic FM Multiplex
Monophonic FM
Remote Amplifiers
Off-The-Air Recording
Antenna Connections
OPERATING INSTRUCTIONS
Stereophonic FM Multiplex
Monophonic FM
ADJUSTMENTS
Muting Threshold
Dial Panel Lights
Output Adjust
GUARANTEE
MR71
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McIntosh MR 71 Specifications

General

Brand	McIntosh
Model	MR 71
Category	Tuner
Language	English

Summary

McIntosh MR 71 Introduction

MR 71 Key Features and Technology

Highlights key improvements like automatic stereo-mono switching, multipath indicator, and PANLOC installation.

McIntosh PANLOC Installation

Explains the unique PANLOC system for easy installation, operation, and maintenance.

McIntosh MR 71 Technical Description

RF and IF Circuitry Details

Details the Nuvistor RF amplifier, cascade amplifier, IF stages, and limiters for optimal reception.

AFC Circuit Functionality

Describes the electronic AFC circuit that simplifies tuning and minimizes distortion.

Muting and Stereo Decoding Circuits

Explains the muting circuit, multiplex decoder, and 19KC/38KC synchronized oscillator.

SCA Filter and Stereo Indicator

Details the SCA filter for noise reduction and the multiplex stereo indicator.

McIntosh MR 71 Guarantee and Service

Standard Product Guarantee

Details the 90-day guarantee against defects in workmanship and components.

3-Year Factory Service Contract

Information on obtaining a free 3-year factory service contract.

McIntosh MR 71 Front Panel Overview

Tuning Dial Scales Description

Description of the megacycle and logging scales for tuning FM stations.

MR 71 Front Panel Indicators

Explanation of the Multipath, Signal Strength, Stereo, and Tuning indicators.

Front Panel Volume Control

Details the function of the front panel volume control for audio output.

McIntosh MR 71 Controls and Modes

Mode Selector and Power Functions

Explains the MODE SELECTOR (Stereo Auto, Mono) and POWER OFF functions.

AFC Control Operation

Describes the AUTO FREQ. CONTROL for adjusting AFC action and tuning ease.

Muting Control Operation

Details the MUTING control for suppressing interstation noise.

PANLOC Buttons Function

Explanation of the PANLOC buttons for securing the tuner in its installation.

McIntosh MR 71 Back Panel Features

Back Panel Adjustments and Test Points

Information on TP 2, MUTING ADJ, and OUTPUT ADJ controls on the back panel.

Back Panel Audio Outputs

Describes the fixed and front-panel controlled audio output jacks.

Back Panel Antenna Connections

Details the 300 ohm and 75 ohm FM antenna terminals.

Power and Fuse Details

Covers the 1A SLO BLO FUSE, AC OUTLET, and PANEL LIGHT SWITCH.

MR 71 Installation Guide

Installation Mounting and Ventilation

Guidelines for cabinet, rack mounting, and proper ventilation to ensure optimal performance.

PANLOC System Installation Details

Instructions for using the exclusive McIntosh PANLOC system for tuner installation.

Connecting the MR 71 Tuner

Audio Output Connections Guide

How to connect audio outputs to preamplifiers or amplifiers.

FM Signal Connections

Steps for connecting stereo and mono FM signals.

Antenna Connection Types

Guidance on connecting 300 ohm dipole and 75 ohm antennas for optimal reception.

Remote Amp and Recording Connections

Connecting to remote amplifiers and for off-the-air tape recording.

MR 71 Operating Instructions

Stereo FM Operation

Steps for tuning and listening to stereophonic FM broadcasts.

Mono FM Operation

Instructions for tuning and listening to monophonic FM broadcasts.

MR 71 Adjustments

Muting Threshold Adjustment Guide

How to adjust the muting threshold for desired noise suppression.

Dial Panel Light Adjustment

Adjusting the brightness of the dial panel lights.

Output Level Adjustment Guide

Adjusting audio output levels for left and right channels.