Audio Research Reference 75

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Summary

Preface

Packaging

Accessories

Warnings

General Safety Precautions

Key safety warnings for operating the amplifier, including hot tubes and electrical hazards.

Grounding and Wiring Safety

Importance of proper grounding and avoiding modifications for safety and warranty.

Fuse Replacement

Guidance on replacing fuses only with the specified type and rating for fire safety.

Vacuum Tube Handling

Instructions for safe installation/removal of vacuum tubes, emphasizing cooling and electrical safety.

Vacuum Tubes and Preparation for Use

Panel Controls

Front Panel Controls

Description of the power switch, rotary knobs, and power indicator LED on the front.

Rear Panel Controls

Explanation of the meter lights toggle switch located on the rear panel.

Installation

Connections

Input Connector

Details on using balanced XLR input connectors for preamplifier connection.

Output Connectors

Instructions for connecting 4 or 8-ohm speaker impedance loads securely.

Speaker Wire and Polarity

Importance of using quality wires and ensuring correct speaker polarity for sonic performance.

Matching Amplifier to Speaker Impedance

Advice on achieving optimal impedance match for power transfer and minimizing distortion.

AC Power Connections

Guidelines for connecting to dedicated AC power, circuit protection, and system power-up order.

Remote Turn-On Connections

Operating Procedure

Start-Up

Step-by-step guide for powering on the amplifier and initiating operation.

Shut-Down

Procedure for safely powering off the amplifier and associated components.

Restarting Note

Important note advising a waiting period before turning the unit on again after shutdown.

Output Tube Bias Adjustment

Servicing

Cleaning

Disposal and Recycling Guidelines

Limited Warranty

Specifications