Ampeg SVP-PRO User's Manual
Contents
1. gt PR Bass Preamp SVP PRO Ampeg is Proudly Made in America SVP PRO Bass Preamg TABLE OF CONTENTS Introduction Features Important Safeguards and Precautions The Front Panel The Rear Panel System Block Diagram Important Information About Tubes and Tube Products Some Suggested Settings Technical Specifications CAUTION PRECAUCION ATTENTION RISK OF ELECTRIC SHOCK RIESGO DE CORRIENTAZO RISQUE D ELECTROCUTION WARNING TO REDUCE THE RISK OF FIRE pR ELECTRIC SHOOK DO NOT EXPOSE PRECAUCION PARA REDUCIR EL RIESGO DE INCENDIOS O DESCARGAS ELECTRICAS NO PER ATTENTION PROT GEZ CET APPAREIL DE LA PLUIE ET DE L HUMIDIT AFIN D VITER TOUT THIS Te eONGEE 19 RAIN OR MO URE TO REDUCE RISK OF ELECTRIC MITA QUE ESTE APARATO Arey EAT UESTO f LA LLUVIA O LA HUMEDAD PARA DISMINUOIR EL eer T ARI OU D LECTROCUTION 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 NO HAY PIEZAS ADENTRO QUE EL USARIO ERCLE 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 e DO NOT OPERATE NEAR ANY HEAT SOURCE AND DO NOT BLOCK ANY VENTILATION OPENINGS ON THIS APPARATUS2. Use this control to adjust the high frequency output level This control provides 12dB of cut or boost at 4kHz 13 GRAPHIC EQ This switch when depressed activates the Graphic EQ When using a footswitch 23 to control the Graphic EQ this switch must be depressed 14 ULTRA HI This switch when depressed boosts the frequencies above those affected by the Bright switch 6 15 GRAPHIC EQ Use these controls to adjust the amplitude of the signal at the fre quency stated above each slider 16 GRAPHIC EQ LEVEL Use this control to adjust the overall output level of the Graphic EQ 17 GRAPHIC EQ ACTIVE PEAK LED This LED illuminates yellow when the EQ section is active This LED will flash when the amplitude of the Graphic EQ signal approaches clipping 18 MASTER Use this control to adjust the overall output signal level 19 POWER INDICATOR LED This LED illuminates green when the preamp is on 20 POWER Use this switch to turn the preamp on side of switch with the dot depressed and off side of switch without the dot depressed gg lill THE U S A I a SLM ELECTRONICS AC LINE IN 1400 FERGUSON AVENUE ST LOUIS MO 63133 21 AC LINE IN Firmly insert the female end of the AC power cord into this socket The grounded power cord should only be plugged into a grounded power outlet that meets all applicable electrical codes and is compatible with the voltage power and fre quency requirements
3. FOR PROPER OPERATION THIS UNIT REQUIRES 3 75CM OF WELL VENTILATED SPACE AROUND HEATSINKS AND OTHER AIR FLOW PROVISIONS IN THE CABINET e DO NOT USE THIS APPARATUS NEAR SPLASHING FALLING SPRAYING OR STANDING LIQUIDS e CLEAN ONLY WITH LINT FREE DAMP CLOTH AND DO NOT USE CLEANING AGENTS e 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 e PROTECT THE POWER CORD FROM DAMAGE DUE TO BEING WALKED ON PINCHED OR STRAINED e UNPLUG THE APPARATUS DURING LIGHTNING STORMS OR WHEN UNUSED FOR LONG PERIODS OF TIME e ONLY USE ATTACHMENTS ACCESSORIES STANDS OR BRACKETS SPECIFIED BY THE MANUFACTURER FOR SAFE OPERATION AND TO AVOID INJURY AIA e WARNING TO REDUCE THE RISK OF ELECTRIC SHOCK OR FIRE DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE e SERVICE MUST BE PERFORMED BY QUALIFIED PERSONNEL e 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 EXPLANATION OF GRAPHICAL SYMBOLS DANGEROUS VOLTAGE IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL EXPLICACION DE SIMBOLOS GRAFICOS A VOLTAJE PELIGROSO A ES NECESARIO QUE EL USUARIO SE REFIERA AL MANUAL DE INSTRUCCIONE
4. stated on the rear panel Do not attempt to defeat the safe ty ground connection 22 AC LINE SELECTOR Use this switch to match the unit to the AC line voltage 23 FOOTSWITCH Use this jack to con nect a two button footswitch to the preamp for remote control of the Mute and Graphic EQ Tip controls Mute ring controls the Graphic EQ The front panel switches remain active when a footswitch is con nected The front panel Graphic EQ switch 13 must be depressed for the footswitch to control the Graphic EQ System Block Diagram BUFFER p TUNER OUT INPUT 15dB PAD iis AIN BRIGHT EQ ON GRAPHIC EQ Serene A GRAPHIC EQ PPT TE ETE TET 23 24 24 PREAMP OUTS Use these jacks to connect the signal from the preamp to your power amplifier mixing console or house PA system 25 EFFECTS LOOP RETURN Use this jack to connect the signal from an external effects processor to the preamp by means of a shielded signal cable 26 EFFECTS LOOP SEND Use this jack to connect the signal from the preamp to the input of an external effects processor by means of a shielded signal cable 27 TUNER OUT Use this jack to connect the preamp to an external tuner The signal at this jack is a direct output from the instru ment This is the only signal which remains active when the Mute switch 2 is depressed t m i a DRIVE BASS TREBLE MID FREQUE HI N PEAK 7S LED CONN ae TRANSFO
5. RMER BAL OUT 28 PRE POST Use this switch to deter mine whether the signal at the Transformer Balanced Out jack 29 is pre EQ switch in the out position or post EQ switch depressed 29 TRANSFORMER BALANCED OUT Use this XLR jack to connect the preamp to an external power amplifier mixing console or house PA system The signal at this jack is pre or post EQ depending on the setting of the Pre Post switch 28 CY PS EFFECTS EFFECTS SEND RETURN LEVEL ror WITCH TRANSFORMER BALANCED OUT PREAMP P OUT MASTER BUFFER i PREAMP OUT gt SVP PRO Bass Pream Important Information About Tubes and Tube Products A BRIEF HISTORY OF THE TUBE In 1883 Edison discovered that electrons would flow from a suspended filament when enclosed in an evacuated lamp Years later in 1905 Fleming expanded on Edison s discovery and created the Fleming Valve Then in 1907 Dr Lee de Forest added a third com ponent the grid to the Fleming s Valve and the vacuum tube was a fact of life The door to electronic amplification was now open During World War II data gleaned from their intensive research on the detectors used in radar systems led Bell Telephone Laboratories to the invention of the transistor This reliable little device gained quick support as the new component for amplification The death of the vacuum tube seemed imminent as designers scientists and engineers reveled in the idea of replacing lar
6. S EXPLICATION DES SYMBOLES GRAPHIQUES DANGER HAUTE TENSION REFERREZ VOUS AU MANUAL D UTILISATION gt SVP PRO Bass Preamp An Introduction to your new Ampeg SVP PRO Bass Preamp The harmonically rich sound and legendary performance of the AMPEG SVT are redefined in the SVP PRO This dynamic preamp delivers unsurpassed quality reliability and tonal flexibility offering the classic vibrancy of tubes as well as contemporary features The SVP PRO is the preamp section of our much respected SVT 2 PRO All of the features and controls of your SVP PRO are covered in detail within the pages of this user s guide We recommend going over them before you use the preamp Features In the world of high performance bass amps Ampeg s SVT amplifiers stand alone Keeping with true Ampeg tradition the SVP PRO Bass Preamp offers you more performance and flexibility than any other preamp in its class Listed below are some of the outstanding features of your new preamp features which set it apart from the competition Additional infor mation on these features can be found on the pages indicated e PAD A switchable attenuator pad this feature is perfect for basses with active electronics or very hot pick ups page 4 e MUTE SWITCH Lets you cut the sound from the amp letting you tune your bass in private page 4 e ULTRA LOW ULTRA HIGH AND BRIGHT SWITCHES Lets you tailor your sound in many different ways with the to
7. Y TREBLE L S E oO 1 6 ULTRA HI7 GRAPHIC EQ OUT HI G OUT EQ MIDRANGE FREQUENCY TREBLE 723465 oO ULTRA HI7 GRAPHIC EQ OUT Ss OUT EQ MIDRANGE FREQUENCY TREBLE 12345 O 1 0 A Note About The Graphic EQ The Graphic EQ can be used in two ways 1 To fine tune your sound make small adjustments at the desired frequencies and leave the EQ on throughout the entire session This is great for adapting to varying room acoustics when going from club to club etc 2 For a completely different sound make larger adjustments and only activate the EQ when you want a second channel sound such as during bass solos gt SVP PRO Bass Pream Technical Specifications TOTAL SYSTEM GAIN TONE CONTROL RANGE Bass Midrange Treble Ultra Low Ultra High Bright GRAPHIC EQ RANGE GRAPHIC EQ LEVEL SIGNAL TO NOISE RATIO TUBE COMPLEMENT POWER REQUIREMENTS Domestic Export SIZE AND WEIGHT 76dB 1kHz w levels up tones flat 3dB 30Hz 15kHz 12dB 40Hz 12dB 15dB Frequency selected 220 450 800 1 6k or 3kHz 12dB 4kHz 30dB 40Hz 12dB 500Hz 8dB 8kHz 70B 2kHz 12dB 40Hz 90Hz 180Hz 300Hz 500Hz 1kHz 2kHz 4KHz 10kKHz 80B 10dB 80dB typical 12AX7 4 12AU7 1 120VAC 60Hz 28VA 100 115VAC 50 60Hz 28VA 230VAC 50 60Hz 28VA 19 W x 1 75 H x 10 D 9 Ibs Ampeg reserves the right to change specific
8. ations without notice Manufacturer s Name Production Facility Production Facility Shipping Facility Office Facility Product Type Declaration Of Conformity 36 Effective 01 01 2001 SLM Electronics 11880 Borman Drive St Louis MO 63146 USA 700 Hwy 202 W Yellville AR 72687 USA 1400 Ferguson Ave St Louis MO 63133 USA 1400 Ferguson Ave St Louis MO 63133 USA Audio Amplifier Complies with the following Standards Safety EMC EN60065 E60065 C22 2 UL6500 and or UL813 Directive 89 336 EEC EN55103 EN55013 EN61000 and or FCC 47CFR 15B clA Supplementary information provided by SLM Electronics R amp D Engineering 1901 Congressional Drive St Louis MO 63146 USA Tel 314 569 0141 Fax 314 569 0175 WWW ampeg com Ampeg is proudly Made in America 1999 SLM Electronics 1400 Ferguson Avenue St Louis MO 63133 U S A P N 47 546 13 032603
9. eaners onto the unit Wipe it with a slightly dampened lint free cloth to remove dirt and film e Do not use the unit if it has sustained damage to the chassis controls or power cord Refer the unit to an authorized service cen ter for inspection e Audio equipment 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 Consider using quality hearing protection devices gt SVP PRO Bass Pream 1 INPUT Use this jack to connect your bass to the preamp by means of a shielded instrument cable 2 MUTE This switch when depressed mutes the signal at all output jacks except the Tuner Out jack 27 3 PAD This switch when depressed attenuates the input signal by 15dB If your bass has active pickups depress this Switch to better accommodate its output signal 4 GAIN Use this control to adjust the level of the input signal When properly set the Peak LED 5 will flash on strong sig nals For the best signal to noise ratio set the Gain control to the highest useable set ting and adjust the Drive and Master con trols 8 18 to obtain the desired output level 5 PEAK MUTE LED This LED illuminates when the preamp signal approaches clip ping When the Mute switch 2 is engaged this LED stays on as a visual indicator that the Mute function is active 6 BRIGHT This switc
10. eptible to the damage caused by vibration Allow the preamplifier to warm up to room temperature before turning it on The heat generated by the tube elements can crack a cold glass housing e Protect the preamplifier from dust and moisture If liquid gets into the preamplifier proper or if the preamplifier is dropped or otherwise mechanically abused have it checked out at an authorized service center before using it e Proper maintenance and cleaning in combination with routine checkups by your authorized service center will insure the best performance and longest life from your preamplifier CAUTION Tube replacement should be performed only by qualified service personnel who are familiar with the dangers of hazardous voltages that are typically present in tube circuitry gt SVP PRO Bass Preamp Some Suggested Settings JAZZ ULTRA LO BRIGHT DRIVE s a G o d o 10 PEAK MUTE BRT ADJUST UNTIL PEAK LED FLASHES FUNK ULTRA LO BRIGHT DRIVE BASS O K OUT o 10 o 10 PEAK MUTE BRT ADJUST UNTIL PEAK LED FLASHES ROCK ULTRA LO BRIGHT DRIVE BASS OUT INL b 10 9 o 10 o 10 PEAK MUTE BRT ADJUST UNTIL PEAK LED FLASHES COUNTRY ULTRA LO BRIGHT DRIVE sas o d o o 10 PEAK MUTE BRT ADJUST UNTIL PEAK LED FLASHES ULTRA HI GRAPHIC EQ OUT S iT EQ TREBLE MIDRANGE FREQUENCY gt 723465 6 ULTRA HI GRAPHIC EQ Ao S OUT EQ MIDRANGE FREQUENC
11. fy the signal from your instrument and shape the sound They are inherently microphonic mechanically pick up and transmit external noises Since these tubes are used in the critical first stages of a tube preamplifier s circuitry it is very important to use high quality low noise low microphonic tubes for this application Although tubes of this quality may be difficult to find and typically cost more than off the shelf tubes the improvement in performance is worth the investment THE NATURE OF TUBES WHY AND WHEN TO REPLACE THEM Tubes are made up of a number of fragile mechanical components that are vacuum sealed in a glass envelope or bubble The tube s longevity is based on a number of factors which include how hard and often the equipment is played vibration from the speakers road travel repeated set up and tear down etc lf your preamplifier squeals makes noise loses gain starts to hum lacks sensitivity or feels as if it is working against you the pre amplifier tubes may need to be replaced Remember to use only high quality low microphonic tubes lf you re on the road a lot we recommend that you carry a set of replacement tubes SURVIVAL TIPS FOR TUBE PREAMPS To prolong tube life observe these tips and recommendations e After using the preamplifier allow sufficient time for it to properly cool down prior to moving it A properly cooled pream plifier prolongs tube life due to the internal components being less susc
12. ge fragile glass tubes with these small solid state devices However there were and still are many serious listeners who realized that the sound produced by a transistor amplifier is significantly different from that produced by a tube amplifier with identical design specifications They considered the sound produced by these new solid state devices to be hard brittle and lifeless It was determined that solid state devices produced a less musical set of harmonics than tubes When pushed past their limits they tend to mute the tone and emphasize the distortion Tubes on the other hand produce a more musical set of harmonics the intensity of which can be controlled by the player This char acteristic adds warmth and definition to the sound which has become the hallmark of tube amplifiers When tubes are driven into clip ping the harmonic overtones can be both sweet and pleasing or intense and penetrating depending on the musician s musical taste and playing technique Over the years application engineers have designed a number of outstanding solid state amplifiers that sound very very good Some use special circuitry which enables them to simulate the distortion characteristics of a tube amplifier However the tube amplifier still held in the highest esteem by many musicians offers a classic vintage sound in a contemporary market PREAMPLIFIER TUBE TYPES AND USAGE The tubes used in preamplifiers 12AX7 12AU7 12AT7 etc ampli
13. h when depressed boosts the upper mid and high frequencies 7 ULTRA LO This switch when de pressed provides emphasis to the low end by boosting the low frequencies and cutting the mid frequencies 9 MIDRANGE FREQUENCY 8 DRIVE Use this control to adjust the level of the distortion In the fully counter clockwise position the preamp is in the cleanest traditional SVT condition As the control is rotated clockwise the distortion level is increased The tone of the signal is also changed to provide a smoother over drive The tone controls may have to be readjusted to obtain the desired tone The Gain control 4 and Pad 3 interact with the Drive control For greater overdrive the Pad switch 3 should be out and the Drive control should be rotated fully clock wise Use the Gain control 4 to set the amount of overdrive desired The Peak LED 5 will remain illuminated when the amplifier is used in this manner 9 BASS Use this control to adjust the low frequency output level This control pro vides 12dB of cut or boost at 40Hz 10 MIDRANGE Use this control to adjust the mid frequency output level This control provides 15dB of cut or 12dB of boost at the frequency selected by the Frequency control 11 11 FREQUENCY Use this control to select the center frequency for the Midrange control 10 The center fre quencies are 220Hz 450Hz 800HZz 1 6kHz and 3kHz 16 17 18 19 20 12 TREBLE
14. uch of a button page 4 e 5 POSITION MIDRANGE SELECTOR Take your pick from the five center frequency points available to get just the right midrange voice page 4 e 9 BAND GRAPHIC EQ Use as a second channel for bass solos or to shape your sound to your own exact ing standards An independent level control lets you adjust the Graphic EQ volume Switchable at front panel or with a footswitch page 4 e TRANSFORMER BALANCED LINE OUT JACK For connection to a recording console PA system or external power amplifier Switchable for Pre or Post EQ operation page 5 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 problems Abiding by the following rules can help prevent damage to your equipment yourself and others e The unit is equipped with a three pronged AC power cord To reduce the risk of electrical shock NEVER remove or otherwise attempt to defeat the ground pin of the power cord Connect the unit ONLY to a properly grounded AC outlet of the proper voltage for your unit 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 unit on a support that might give out under its weight Unplug the unit before cleaning it NEVER spray liquid cl
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