Ampeg PBC228 Musical Instrument Amplifier User Manual
Contents
1. console or recording equipment The signal at this jack may be pre or post EQ depending on the setting of the Pre Post switch 23 23 PRE POST This switch determines whether the signal at the Transformer Bal Line Out jack 22 is pre EQ switch out or post EQ switch depressed 24 LIFT GND This switch when de pressed isolates the chassis from the ground pin of the Transformer Bal Line Out jack 22 This may reduce residual hum and buzz which is sometimes picked up by line out signal cables 228 PortaBass Amplifier Troubleshooting In the unlikely event that your PBC228 should malfunction take a few minutes to troubleshoot it before you call for serv ice Sometimes you can save yourself time and money by doing it yourself and often the cure for the problem is simple NO SOUND LEDs DON T LIGHT Check AC outlet OUTLET OK NO POWER Check house fusebox or circuit breaker LEDs LIGHT Check amp controls check for signal from bass NO SOUND SOUND Check power cord fuse circuit breaker power switch Check speaker Unplug bass touch tip of cable NOCHANGE LOUD HUM Replace cable Check inst pickup CHANGE 500 0 OK SEE BELOW POOR SOUND Check bass cables POOR SOUND Check speaker s SPEAKER S OK POOR SOUND SPEAKER S DEFECTIVE Replace speaker s POOR SOUND SEE BELOW If the p2. heat sinks transformers and filter capacitors e THREE BAND ROTARY EQ Three bands of equalization and a selectable middle frequency provide optimum tone control e TWO SEPARATE CHANNELS Change instruments without swapping instrument cables or read justing amp controls e ULTRA LOW ULTRA HIGH SWITCHES Enhances flexibility and tone control e EFFECTS LOOP Send and Return jacks are combined with an Effects Blend control for virtually noise free use of your favorite effects e TRANSFORMER BALANCED LINE OUTPUT jack with level control ground lift and pre post EQ switch for patching into house consoles mixing boards or external power amplifiers ULTRA PORTABLE COMBO POWER Two 8 neodymium speakers combined with the lightest strongest materials available add up to the biggest sounding little combo imaginable PROUDLY MADE IN THE U S A This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequen cy energy and if not installed and used in accordance with the instructions may cause harmful interfer ence to radio communications However there is no guarantee that interference will not occur in a par ticular installation If this equipment does cause harmful interferenc
3. Bass Amplifier SS UNSER RAR DRE etg teto e ere c des Pare 9 ul User s G PBC228 PortaBass Amplifier Thank you for choosing the Ampeg PBC 228 PortaBass Amplifier The PBC228 features Ampeg s radical new Micro Dynamic Technology power amp circuitry and two 8 neodymium speakers This gives you the ultimate combination of power tone and portability in a small light weight package In order to obtain maximum performance and enjoyment from your new Ampeg amplifier please read these instructions prior to its use TABLE OF CONTENTS Features The Front Panel Controls and Their Use The Rear Panel Troubleshooting System Block Diagram Technical Specifications 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 PROTEGEZ CET APPAREIL DE LA PLUIE ET DE L HUMIDITE AFIN D EVITER 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 ELECTROCUTION POUR REDUIRE D ELECTROCUTION NE PAS ENLEVER SHOCK DO NOT REMOVE COVER NO USER SERVICEABLE PARTS INSIDE REFER RIESGO DE CORRIENTAZO NO ABRA LA CUBIERTA N
4. O 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 LINT FREE DAMP CLOTH AND DO NOT USE CLEANING AGENTS 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 SO
5. UND 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 A ES NECESARIO QUE EL USUARIO SE REFIERA AL MANUAL DE INSTRUCCIONES EXPLICATION DES SYMB LES GRAPHIQUES DANGER HAUTE TENSION REFERREZ VOUS AU MANUAL D UTILISATION PBC228 PortaBass Amplifier Features In the world of high performance bass amps Ampeg amplifiers stand alone In true Ampeg tradition the PBC228 offers you more power performance and tone than any other bass amplifier in its class The outstand ing features which set your new amplifier apart from the competition are listed below e MDT POWER AMP SWITCH MODE SUPPLY Micro Dynamic Technology amplifier circuitry and a switch mode regulated power supply provide maximum power in a small lightweight package the effi ciency of these designs eliminates the need for heavy
6. With this control in the fully counterclockwise posi tion no effect is applied to the signal As you rotate the control clockwise the level of the effect increases and the level of dry signal decreases portapass228 9 LIMIT EFFECTS BLEND MASTER 10 10 11 12 13 14 15 NOTE When using the effects loop with a compressor limiter this control must be rotated fully clockwise for optimum results 12 LIMIT This LED illuminates when the internal limit circuit is activated This indi cates that the amplifier is nearing full out put and the limiter is keeping the amplifier from clipping the output signal 13 MASTER Use this control to adjust the output level of the amplifier If the Limit LED illuminates reduce this control until the Limit LED only flashes on strong signals 14 POWER ON INDICATOR This light illuminates when the amplifier is turned on 15 POWER Use this switch to apply power to the amplifier The amp is on when the top of the switch is depressed and off when the bottom of the switch is de pressed PBC228 PortaBass Amplitier The Rear Panel E BU a TA D N Bm 4 wills VAS 05 N sre 5 7 RISK OF SHOCK PEN LECTRIQUE VRIR IE OR vice may 16 AC LINE IN Firmly insert the female end of the supplied AC power cord into this socket The grounded power cord should only be plugged into a grounded power outlet that meets a
7. control until the Peak LED 4 flashes on strong signal peaks 4 PEAK This LED will illuminate when the level of the preamp signal is close to over driving the amplifier For the best signal to noise ratio set the Gain control 3 so the Peak LED flashes on strong signal spikes during normal playing of your instrument 5 ULTRA LOW This switch when de pressed increases the low frequency out put by 6dB at 40Hz ULTRA LOW LOW 10 10 200Hz 2kHz O MID FREQ TkHz ULTRA MID HIGH HIGH 10 0 10 200Hz 2kHz O 6 LOW Use this control to adjust the low frequency level of the amplifier This control allows an adjustment of 16dB at 100Hz 7T MID Use this control to adjust the midrange frequency level of the amplifier This control allows an adjustment of 17dB at the frequency selected by the Mid Freq control 8 8 MID FREQ Use this control to select the frequency for the Mid control 7 The Mid Freq is sweepable from 180Hz fully count er clockwise to 1 8kHz fully clockwise 9 HIGH Use this control to adjust the high frequency level of the amplifier This control allows an adjustment of 15dB at 5kHz 10 ULTRA HIGH This switch when de pressed increases the high frequency out put by 8dB at 10kHz 11 EFFECTS BLEND Use this control to adjust the level of external effects that are connected to the Effects Send and Return jacks 21 and 20 rear panel
8. ds E60065 or C22 2 No 1 M90 CE safety standard EN60065 CE EMC standards EN55103 or EN55013 and EN61000 C tick designation Level 2 ABN 56748810738 ARBN N222 KETI standard K60065 limited model approval Compliance Support Contact SLM Electronics Attn R amp D Compliance Engineer 1901 Congressional Drive St Louis Missouri 63146 Tel 314 569 0141 Fax 314 569 0175 www ampeg com Made with Pride in the U S A by Ampeg 22005 SLM Electronics 1400 Ferguson Avenue St Louis MO 63133 U S A mx P N 47 053 41 040405
9. e to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and the receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help Changes or modifications to this device not expressly approved by SLM Electronics could void the user s authority to operate the equipment under FCC rules Speakor is a registered trademark of Neutrik USA 3 PBC228 PortaBass Amplitier The Front Panel Controls and Their Use gt 44 9 GAIN 9 9 Items 1 through 10 are typical for chan nels 1 and 2 1 OdB Connect your bass guitar here by means of a shielded instrument cable If your bass has active electronics or high output pickups or if the Peak LED 4 illu minates at low signal levels connect your bass to the 12dB jack 2 2 12dB Connect your bass guitar here by means of a shielded instrument cable If your bass has passive electronics or low output pickups or if the Peak LED 4 does not illuminate at high signal levels connect your bass to the OdB jack 1 3 GAIN Use this control to adjust the level of the signal going into the preamp Adjust this
10. ll applicable electrical codes and is compatible with the voltage power and frequency requirements stated on the rear panel Do not attempt to defeat the safety ground connection 17 CIRCUIT BREAKER The circuit breaker protects the unit from damage caused by excessive current demands If the amplifier stops working check the cir cuit breaker If it has opened the button will protrude showing a contrasting color Reset the circuit breaker by depressing it until it latches The breaker must cool down for a short time before the button will latch If the circuit breaker opens repeatedly have the amplifier inspected by a qualified service person SEND RETURN EINTHEUSA Y 1400 ERGUSON AVE UE Si LOUIS MO 631 18 19 20 18 EFFECTS SEND When using an external effect connect this jack to the effect s input by means of a shielded signal cable 19 EFFECTS RETURN When using an external effect connect the effect s output into this jack by means of a shielded signal cable 20 LINE OUT Use this 1 4 jack to send a post EQ line level signal to an external amplifier mixing console or recording equipment 21 LEVEL Use this control to adjust the level of the signal at the Transformer Bal Line Out jack 22 Ir AML pre 2 amm POST oy F 21 222324 22 TRANSFORMER BAL LINE OUT Use this XLR jack to send a line level sig nal to an external amplifier mixing
11. roblem isn t covered above or if the steps lead you here then contact your Ampeg dealer for service infor mation Also you should refer your amp to an authorized service center for servicing if it gets dropped has liquid spilled into it or sustains damage to its power cord see page 3 PBC228 PortaBass Amplifier System Block Diagram ULTRA ULTRA LOW e e ULTRA ULTRA LOW HIGH 2 E y 7 o LIMIT POWER AMP 8 SPEAKER LOW MID MID HIGH FREQ LOW MID MID HIGH FREQ PBC228 PoraBass lifier Technical Specifications OUTPUT POWER RATING 200 Watts RMS internal speaker load TONE CONTROLS Ultra Low 6dB 40Hz Low 16dB 100Hz Mid 17dB Selected Frequency Mid Freq 180Hz 1 8kHz High 15dB 9 5kHz Ultra High 8dB 9 10kHz GAIN 65dB SIGNAL TO NOISE RATIO 80dB typical INTERNAL SPEAKERS 2 8 Neodymium 8 ohm 150 W 2 vcd LINE POWER REQUIREMENTS 50VA SIZE AND WEIGHT 16 25 W x 16 25 H x 11 D 31 Ibs Ampeg reserves the right to change specifications without notice Declaration of Conformity Manufacturer s Name SLM Electronics Corporate Headquarters 1901 Congressional Drive St Louis Missouri 63146 Primary Production Facility 700 Hwy 202 W Yellville Arkansas 72687 Product Type Audio Amplifier Products meet the regulations for compliance marking under ETL standards UL6500 UL60065 or UL813 CSA standar
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