Ampeg V4BH - User Manual

Owner’s Guide
for the
V4BH
Bass Amplifier
Made in the U.S.A. by

Ampeg V4BH Specifications

Power

output power rating	100 watts RMS
power requirements	115VAC, 60Hz, 190VA; 100/115VAC, 50/60Hz, 190VA; 230VAC, 50/60Hz, 190VA

Audio Specifications

total system gain	59dB @ 1kHz
tone control range - bass	±12dB @ 40Hz
tone control range - midrange	+10dB, -20dB @ 220, 450, 800, 1.6k or 3kHz
tone control range - treble	+15dB, -20dB @ 4kHz
ultra low	+2dB @ 40Hz, -10dB @ 500Hz
ultra high	+9dB @ 8kHz
presence	+6dB @ 10kHz
signal to noise ratio	80dB typical

Tube Complement

12AX7 tubes	2
12AU7 tubes	2
6L6/5881 tubes	4

Weight and Dimensions

width	23-3/4”
height	11”
depth	12-3/4”
weight	40 lbs

Summary

Important Safeguards and Precautions

General Safety Advice

Key safety rules for operation, grounding, and avoiding damage to the unit and user.

Safety Warnings and Instructions

Crucial warnings and step-by-step instructions to prevent electrical shock and hazards.

Introduction to the V4 BH Bass Amplifier

Key Features of the V4 BH

System Block Diagram

The Front Panel Controls and Their Use

Input Jacks and Gain Control

Details on connecting instruments and adjusting the initial signal level via input jacks and gain.

Tone Shaping Controls

Explanation of controls for Bass, Midrange, Treble, Ultra Lo/Hi, and Frequency selection.

Master and Power Controls

Information on master volume, standby, and power functions for amplifier operation.

The Rear Panel

Power and Signal Connections

Details on fuse, AC input, preamp outputs, and power amp input connections.

Speaker and Impedance Controls

Explanation of presence switch, speaker outputs, and impedance matching for speaker cabinets.

Suggested Settings for Various Genres

Changing the Tubes

Troubleshooting Guide

Technical Specifications