Gallien-Krueger 400RB-III User Manual

Service Manual
400RB-III Series

Gallien-Krueger 400RB-III Specifications

General

Brand	Gallien-Krueger
Model	400RB-III
Category	Musical Instrument Amplifier
Language	English

Summary

Introduction to the 400RB Series

Quick Start Guide

Sound Tips and Techniques

Safety Precautions

Installation and Maintenance

Front Panel Control Layout

Rear Panel Connections

400RB Series Combo Units

Tech Talk Insights

400RB Series Characteristics

Explains key features like power supply, EQ, direct out, and build quality.

Advanced Equalization System

Details the unique, bass-specific GK equalization design and its benefits for tone shaping.

Technical Specifications

Turn-On and Testing Procedures

Setup Procedures

Outlines initial setup steps, including safety precautions and component checks before powering on.

Power Amp Bias and Output Testing

Details the process for testing and adjusting the power amplifier's bias and output signals.

Tones and Filters Testing

Explains how to test EQ and voicing filter responses using specific settings and waveforms.

Noise Level Testing

Describes methods for measuring and verifying the amplifier's noise floor across different control settings.

Bill of Materials