V4BH Bass Amplifier
Table of Contents
Important Safeguards and Precautions . . . . . . . . . . . . . .2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .3
The Front Panel Controls and Their Use . . . . . . . . . . . . .4
The Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Some Suggested Settings . . . . . . . . . . . . . . . . . . . . . . . .6
Changing the Tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Technical Specifications . . . . . . . . . . . . . . . . . .back cover
Important Safeguards and Precautions
All Ampeg products are designed for continuous safe operation, as long as common sense is used and steps are taken to help avoid certain prob- lems. Abiding by the following rules can help prevent damage to your amplifier, yourself and others.
•The amplifier is equipped with a
•Connect the amplifier ONLY to a properly grounded AC outlet of the proper voltage for your amp. If no grounded outlet is available, use only an approved method of adapting to a
•Avoid sudden temperature extremes, rain and moisture. Also, avoid sudden and intense impact. (If the unit has been subjected to any of the preceding abuses, have it looked at by an authorized service center.)
•NEVER set the amplifier on a support that might give out under its weight.
•Always keep the total impedance at or above the rated load.
•Unplug the amplifier before cleaning it. NEVER spray liquid cleaners onto the unit. Wipe the unit with a slightly dampened,
•Don’t use the amplifier if it has sustained damage to the chassis, controls, or power cord. Refer the unit to an authorized service center for inspection.
•Amplifiers capable of producing high volume levels are also capable of inflicting permanent hearing loss or damage, if the exposure to such levels is prolonged. Such damage is progressive and irreversible! Caution is advised and ear protection recommended when playing at extremely loud levels.
The chart below shows the U.S. Government Occupational Safety and Health Administration (OSHA) regulations which were in effect at the time of this publication for permissible noise exposure, per 29CRF1910, Table
SOUND LEVEL dBA | DURATION PER DAY | SOUND LEVEL dBA | DURATION PER DAY |
SLOW RESPONSE | IN HOURS | SLOW RESPONSE | IN HOURS |
|
|
|
|
90 | 8 | 102 | |
92 | 6 | 105 | 1 |
95 | 4 | 110 | 1/2 |
97 | 3 | 115 | 1/4 or less |
100 | 2 |
|
|
According to OSHA, any exposure in excess of those listed above could result in some hearing loss.
2
|
|
|
|
|
|
|
|
|
|
|
| CAUTION |
|
|
| PRECAUCION |
|
|
| ATTENTION |
|
| RISK OF ELECTRIC SHOCK |
|
|
| RIESGO DE CORRIENTAZO |
|
|
| RISQUE D'ELECTROCUTION |
|
| DO NOT OPEN |
|
|
| NO ABRA |
|
|
| NE PAS OUVRIR |
|
|
|
|
|
|
|
|
|
| ||
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE |
| PRECAUCION: PARA REDUCIR EL RIESGO DE INCENDIOS O DESCARGAS ELECTRICAS, NO PER- |
| ATTENTION: PROTÉGEZ CET APPAREIL DE LA PLUIE ET DE L'HUMIDITÉ AFIN D'ÉVITER TOUT | ||||||
THIS APPARATUS TO RAIN OR MOISTURE. TO REDUCE THE RISK OF ELECTRIC |
| MITA QUE ESTE APARATO QUEDE EXPUESTO A LA LLUVIA O LA HUMEDAD. PARA DISMINUOIR EL |
| RISQUE D'INCENDIE OU D'ÉLECTROCUTION. POUR REDUIRE D'ELECTROCUTION NE PAS ENLEVER | ||||||
SHOCK, DO NOT REMOVE COVER. NO |
| RIESGO DE CORRIENTAZO. NO ABRA LA CUBIERTA. NO HAY PIEZAS ADENTRO QUE EL USARIO |
| LE COUVERCLE. AUCUNE PIECE INTERNE N'EST REPRABLE PAR L'UTILISATEUR. POUR TOUTE | ||||||
SERVICING TO QUALIFIED SERVICE PERSONNEL. |
| PUEDO REPARAR DEJE TODO MANTENIMIENTO A LOS TECHNICOS CALIFICADOS. |
| REPARATION, S'ADRESSER A UN TECHNICIEN QUALIFIE. | ||||||
IMPORTANT SAFETY INSTRUCTIONS
•READ, FOLLOW, HEED, AND KEEP ALL INSTRUCTIONS AND WARNINGS.
•DO NOT OPERATE NEAR ANY HEAT SOURCE AND DO NOT BLOCK ANY VENTILATION OPENINGS ON THIS APPARATUS. FOR PROPER OPERATION, THIS UNIT REQUIRES 3” (75CM) OF WELL VENTILATED SPACE AROUND HEATSINKS AND OTHER AIR FLOW PROVISIONS IN THE CABINET.
•DO NOT USE THIS APPARATUS NEAR SPLASHING, FALLING, SPRAYING, OR STANDING LIQUIDS.
•CLEAN ONLY WITH
•ONLY CONNECT POWER CORD TO A POLARIZED, SAFETY GROUNDED OUTLET WIRED TO CURRENT ELECTRICAL CODES AND COMPATIBLE WITH VOLTAGE, POWER, AND FREQUENCY REQUIREMENTS STATED ON THE REAR PANEL OF THE APPARATUS.
•PROTECT THE POWER CORD FROM DAMAGE DUE TO BEING WALKED ON, PINCHED, OR STRAINED.
• UNPLUG THE APPARATUS DURING LIGHTNING STORMS OR WHEN UNUSED FOR LONG PERIODS OF TIME.
• ONLY USE ATTACHMENTS, ACCESSORIES, STANDS, OR BRACKETS SPECIFIED BY THE MANUFACTURER FOR SAFE OPERATION AND TO AVOID INJURY.
• WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK OR FIRE, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.
•SERVICE MUST BE PERFORMED BY QUALIFIED PERSONNEL.
•OUR AMPLIFIERS ARE CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS. CONTINUED EXPOSURE TO HIGH SOUND PRESSURE LEVELS CAN CAUSE PERMA- NENT HEARING IMPAIRMENT OR LOSS. USER CAUTION IS ADVISED AND EAR PROTECTION IS RECOMMENDED IF UNIT IS OPERATED AT HIGH VOLUME.
•WARNING: THIS UNIT REQUIRES A SAFETY GROUNDED OUTLET WIRED TO CURRENT ELECTRIC CODES HAVING THE LINE SUPPLY VOLTAGE, POWER, AND FREQUENCY IDENTIFIED ON THE REAR OF THE UNIT. THE OUTLET MUST REMAIN ACCESSIBLE TO DISCONNECT THE UNIT IF A FAULT SHOULD ARISE WHILE IN USE. THIS UNIT SHOULD BE UNPLUGGED WHEN NOT IN USE.
EXPLANATION OF GRAPHICAL SYMBOLS: | "DANGEROUS VOLTAGE" | "IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL" |
EXPLICACION DE SIMBOLOS GRAFICOS: | = “VOLTAJE PELIGROSO” | = “ES NECESARIO QUE EL USUARIO SE REFIERA AL MANUAL DE INSTRUCCIONES.” |
EXPLICATION DES SYMBÔLES GRAPHIQUES: | "DANGER HAUTE TENSION" | |
|