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McIntosh MR 78 User Manual

McIntosh MR 78
20 pages
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THE McINTOSH MR 78 SOLID STATE FM/FM STEREO TUNER
Reading Time 32 Minutes
Price $1.25
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McIntosh MR 78 Specifications

General IconGeneral
BrandMcIntosh
ModelMR 78
CategoryTuner
LanguageEnglish

Summary

Customer Service and Guarantee

Customer Service Contact

Contact information for McIntosh customer service for operational questions.

McIntosh Guarantee and Service Contract

Details on the 90-day guarantee and the Three Year Factory Service Contract.

Installation Guide

Mounting Space and Ventilation

Recommendations for adequate ventilation and required physical space for the tuner.

Template and Panel Preparation

Using the template to mark and prepare the cabinet panel for installation.

Drilling and Cutout Procedures

Instructions for drilling mounting holes and sawing the main cutout.

Mounting Strip and Bracket Installation

Attaching mounting strips and Panloc shelf brackets to the cabinet.

Unit Installation and Securing

Sliding the tuner into the cabinet and securing it with Panloc buttons.

Connecting Your MR 78 Tuner

Audio Output Connections

Details on using FIXED and FRONT PANEL CONTROLLED audio output jacks.

FM Antenna Connection Options

Connecting outdoor, indoor dipole, or 75 ohm antennas to the tuner.

Back Panel Information

Test Points, Power Outlet, and Fuse

Information on test points, the 120V AC outlet, and the protective fuse.

Antenna and Audio Output Jacks

Description of antenna connection strip and audio output jacks.

Front Panel Controls and Functions

Volume Control and Power Switch

Function of the volume knob for level adjustment and power on/off.

Tuning Dial and Signal Meters

Using the tuning dial, signal strength, and tuning meters for station selection.

Stereo Indicator and Mode Selector

Understanding the stereo indicator and the MODE switch settings.

Muting Switch Operation

How the muting switch suppresses interstation noise.

Filter and Selectivity Controls

Using the FILTER and SELECTIVITY switches for optimal reception.

Signal Strength and Multipath Meter

Interpreting the meter for signal strength or multipath interference.

Secondary Panel Controls

Dial scale intensity and antenna match selector switches.

Listening to the MR 78 Tuner

Receiving Monophonic FM Programs

Recommended settings for optimal monophonic FM reception.

Receiving Stereo FM Programs

Settings for automatic stereo/mono switching and stereo-only mode.

Utilizing Variable Selectivity

How to use NORMAL, NARROW, and SUPER NARROW selectivity settings.

Performance Specifications

Guarantee and Basic Performance Limits

McIntosh performance guarantee, tuning range, antenna inputs, IF, sensitivity.

Distortion, Drift, and Frequency Response

Harmonic distortion, drift, frequency response, and capture ratio.

Selectivity, Rejection, and IM Distortion

IHF selectivity, spurious rejection, image rejection, intermodulation distortion.

Signal Input, Muting, and Audio Output

Max signal input, audio hum, muting, SCA filter, stereo separation, audio output.

General and Mechanical Specifications

Power requirements, semiconductors, physical size, weight, finish, and mounting.

Typical Performance Charts

IF Selectivity and Time Delay Characteristics

Charts showing IF selectivity and time delay for different settings.

Harmonic Distortion Analysis

Graph illustrating harmonic distortion versus frequency at normal selectivity.

Intermodulation Distortion Analysis

Graph showing intermodulation distortion versus frequency at normal selectivity.

Stereo Separation and Signal Performance

Charts for stereo separation limits and signal performance.

Technical Description

Tuning Mechanism and Dial Drive

Description of the smooth flywheel tuning mechanism and illuminated dial pointer.

Front End RF Amplifier Design

Details on the cascode circuit RF amplifier, overload rejection, and antenna matching.

Rimo Filter IF Amplifier

Explanation of the linear-phase Rimo filter for minimal FM distortion.

Selectivity Filter Characteristics

Description of filter characteristics for NORMAL, NARROW, and SUPER NARROW settings.

Linear-Phase Bridge Discriminator

Description of the new FM detector for distortionless demodulation.

Stereo Decoder and Filter

Details on the integrated circuit audio amplifier and stereo filter.

Audio Preamplifier Section

Function of the two-transistor amplifiers for audio output.

Power Supply Design

Explanation of the regulated 24-volt and half-wave rectifier power supplies.

Block Diagram Overview

RF & IF Section Block Diagram

Diagram illustrating the radio frequency and intermediate frequency signal paths.

Multiplex and Audio Section Block Diagram

Diagram showing the signal flow through the multiplex and audio stages.

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