Ampeg_SVT-2_PRO_Users_Guide电路图.pdf

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1、Owners Guide for the Owners Guide for the Ampeg is Proudly Made in AmericaAmpeg is Proudly Made in America Bass AmplifierBass Amplifier -15dB PAD MUTEPEAK / MUTE ULTRA LO BRIGHT ULTRA HI GRAPHIC EQ MASTERTREBLEFREQUENCYMIDRANGEBASSDRIVEGAININPUTPOWERSTANDBY -12dB 0 +12dB -10dB 0 +8dB 40Hz90Hz 180Hz

2、300Hz 500Hz 1kHz2kHz4kHz 10kHzLEVEL ACTIVE / PEAK RadioFans.CN 收音机爱 好者资料库 2 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

3、 prevent damage to your preamp, yourself and others. The amplifier 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 amplifier ONLY to a properly grounded AC outlet of the

4、proper voltage for your amp. 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

5、 its weight. When using tall or stacked speaker cabinets, use them ONLY on a level surface. NEVER set tall or stacked cabinets on a surface with more than a five degree incline since tipping or falling could occur, possibly caus- ing serious injuries. Always keep the total speaker impedance at or ab

6、ove the rated load. Unplug the amplifier before cleaning it. NEVER spray liquid cleaners onto the amp. Wipe it with a slightly dampened, lint-free cloth to remove dirt and film. Dont use the amplifier if it has sustained damage to the chassis, controls, or power cord. Refer the unit to an authorized

7、 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 RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: TO REDUCE

8、THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. ATTENTION RISQUE DELECTROCUTION NE PAS OUVRIR ATTENTION: POUR REDUIRE DELECTROCUTION NE PAS ENLEVER LE COUVERCLE. AUCUNE PIECE INTERNE NEST REPRABLE PAR LUTILISATEUR. PO

9、UR TOUTE REPARATION, SADRESSER A UN TECHNICIEN QUALIFIE. VORSICHT ELEKTRISCHE SCHLAGGEFAHR NICHT OFFENEN VORSICHT: ZUR MINIMIERUNG ELEKTRISCHER SCHLAGGEFAHR NICHT DEN DECKEL ABENHMEN. INTERNE TEILE KONNEN NICHT VOM BENUTZER GEWARTET WERDEN. DIE WARTUNG IS QUALIFIZIERTEM WARTUNGSPERSONAL ZU UBERLASSE

10、N. THIS EQUIPMENT HAS BEEN DESIGNED AND ENGINEERED TO PROVIDE SAFE AND RELIABLE OPERATION. IN ORDER TO PROLONG THE LIFE OF THE UNIT AND PREVENT ACCIDEN- TAL DAMAGES OR INJURY, PLEASE FOLLOW THESE PRECAUTIONARY GUIDELINES: WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT OPEN CHASSIS; DO NOT DEF

11、EAT OR REMOVE THE GROUND PIN OF THE POWER CORD; CONNECT ONLY TO A PROP- ERLY GROUNDED AC POWER OUTLET. CAUTION: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. CAUTION: NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. C

12、AUTION: OUR AMPLIFIERS ARE CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS. CONTINUED EXPOSURE TO HIGH SOUND PRESSURE LEVELS CAN CAUSE PERMANENT HEARING IMPAIRMENT OR LOSS. USER CAUTION IS ADVISED AND EAR PROTECTION IS RECOMMENDED IF UNIT IS OPERATED AT HIGH VOLUME. The chart below shows the U.S. Go

13、vernment Occupational Safety and Health Administration (OSHA) regulations which were in effect at the time of this publication for permissible noise exposure, per 29CRF1910, Table G-16. According to OSHA, any exposure in excess of those listed above could result in some hearing loss. IT IS NECESSARY

14、 FOR THE USER TO REFER TO THE INSTRUCTION MANUAL REFERREZ-VOUS AU MANUAL DUTILISATION UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN EXPLANATION OF GRAPHICAL SYMBOLS: DANGEROUS VOLTAGE DANGER HAUTE TENSION GEFAHLICHE SPANNUNG = SOUND LEVEL dBADURATION PER DAY SLOW RESPONSEIN HOURS 908 926 954 973

15、 1002 SOUND LEVEL dBADURATION PER DAY SLOW RESPONSEIN HOURS 1021-1/2 1051 1101/2 1151/4 or less TABLE OF CONTENTS Important Safeguards and Precautions . . . . . . . . . . . . . . .2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Features . . . . . . . . . . . .

16、 . . . . . . . . . . . . . . . . . . . . . . . . . .3 System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .3 The Front Panel Controls and Their Use . . . . . . . . . . . . . .4 The Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Some Suggested Setti

17、ngs . . . . . . . . . . . . . . . . . . . . . . . . .6 Changing the Tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Setting Tube Bias . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . .back cover Technical

18、Specifications . . . . . . . . . . . . . . . . . . .back cover SVT-2 PRO Bass Amplifier RadioFans.CN 收音机爱 好者资料库 3 An Introduction to your new Ampeg SVT-2 PRO Bass Amplifier The harmonically rich sound and legendary performance of the AMPEG SVT are redefined in the SVT-2 PRO. This dynamically powerfu

19、l bass amplifier delivers a thundering 300 watts of unsurpassed quality, reliability and tonal flexibility, offering the classic vibrancy of tubes as well as contemporary features. All of the features and controls of your SVT-2 PRO are covered in detail within the pages of this owners guide. We reco

20、mmend going over them before you use the amplifier. Features In the world of high performance bass amps, Ampegs SVT amplifiers stand alone. Keeping with true Ampeg tra- dition, the SVT-2 PRO Bass Amplifier offers you more performance and flexibility than any other amplifier in its class. Listed belo

21、w are some of the outstanding features of your new preamp - features which set it apart from the competition! Additional information on these features can be found on the pages indicated. ATTENUATOR: A switchable input pad, this feature is perfect for basses with active electronics or very “hot” pic

22、kups (page 4). MUTE SWITCH: Lets you cut the sound from the amp, letting you tune your bass in private (page 4). ULTRA LOW, ULTRA HIGH AND BRIGHT SWITCHES: Lets you tailor your sound in many different ways “with the touch of a button” (page 4). 5-POSITION MIDRANGE SELECTOR: Take your pick from the f

23、ive center frequency points available to get just the right midrange voice (page 4). 9-BAND GRAPHIC EQ: Use as a “second channel” for bass solos, or to shape your sound to your own exacting standards. An independent level control lets you adjust the Graphic EQ volume. Switchable at front panel or wi

24、th a footswitch (page 4). BIAS ADJUSTMENT CONTROLS: Let you adjust the tube bias for proper operation (pages 5,7). SLAVE OUT: Use for powering another amp from the SVT-2 PROs preamp (page 5). System Block Diagram SVT-2 PRO Bass Amplifier GAIN LEVEL INPUT -15dB PAD BUFFER TUNER OUT FREQUENCY PEAK LED

25、 DRIVE MIDBRIGHT EQ ON ULTRA LOW BASS TREBLE ULTRA HIGH IMPEDANCE 4 OHMS 2 OHMS MUTE PRE/POST LEVEL MASTER BIAS ADJUST BALANCED OUT GRAPHIC EQ EFFECTS SEND EFFECTS RETURN BUFFER PREAMP OUT POWER AMP PROTECTION SLAVE OUT 1/4 JACK 1/4 JACK SPEAKON JACK SPEAKER OUTPUTS PWR AMP INPUT PWR AMP POWER STDBY

26、 FAULT BIAS INDICATORS 1+ 2+ 1-2- GRAPHIC EQ MUTE FOOTSWITCH SWITCHING CIRCUIT RadioFans.CN 收音机爱 好者资料库 4 SVT-2 PRO Bass Amplifier The Front Panel Controls and Their Use 1. INPUT: This jack accepts a passive or active instrument or a line level signal through a shield- ed instrument cable. 2. PAD: Th

27、is switch attenuates the input signal by 15dB. Attenuation allows the Gain control (4) to be used in a more usable (higher) position. If clipping is indicated even with the Gain control all the way down, attenuation is needed. 3. MUTE:This switch kills the input to everything except the Tuner Out (3

28、4) to allow silent tuning. 4. GAIN: This control, along with the Attenuator switch (2), adjusts the basic level of signal in the preamp. To get the best signal to noise ratio, set this control so that, on the loudest passages, the Peak LED (5) flashes occasionally. 5. PEAK/MUTE LED: This LED flashes

29、 when the signal level in the preamp (excluding the Graphic EQ) approaches clipping. When the Mute switch (3) is engaged, this LED stays on as a visual indicator that Mute is active. 6. ULTRA LOW: This switch, when engaged, provides emphasis to the low frequencies by boosting the low frequencies and

30、 selectively cut- ting the mid frequencies. 7. BRIGHT: This switch, when pushed IN, boosts upper mid and high frequencies. 8. DRIVE: This control is used to overdrive the preamp in order to get various distortion sounds. In the fully counterclockwise position the preamp is in the cleanest, tradition

31、al SVT condition. As the control is rotated clockwise, signal level is increased to drive the preamp harder (into distor- tion). The tone of the signal is also changed to provide a smoother overdrive. The tone controls may have to be readjusted to obtain the overall desired tone. The Gain control (4

32、) and Attenuator switch (2) interact with the Drive control. For greater overdrive, the Attenuator switch should be out and the Drive control fully clockwise. Use the Gain control to set the amount of overdrive desired. The Peak LED (5) will glow a steady red when the amp is used in this manner. 9.

33、BASS: This is the primary low frequency con- trol. It allows for 12dB of cut or boost at 40Hz. 10. MIDRANGE: This is the primary midrange control. It allows for 15dB of cut or 12dB boost at the center frequency selected by the Frequency control (11). 11. FREQUENCY: Allows you to select the cen- ter

34、frequency for the Midrange control (10), giving you a choice of five “voices” for the Midrange. The center frequencies are (from left to right) 220Hz, 450Hz, 800Hz, 1.6kHz and 3kHz. 12. TREBLE: This is the primary high frequency control. It allows for 12dB of cut or boost at 4kHz. 13. MASTER: This c

35、ontrols the signal to the power amp and therefore the overall listening level. It also controls the level to the Preamp Out jack (27). 14. ULTRA HIGH: This switch boosts higher fre- quencies than those affected by the Bright switch (7). 15. GRAPHIC EQ: This switch places the Graphic EQ circuitry in

36、or out of the signal path. The switch must be pushed IN for the Graphic EQ footswitch to function. In the OUT position, there is no solid state circuitry in the signal path from input to power amp out. 16.STANDBY/POWER/FAULT INDICATOR LED: This is a multi functional LED. In Standby mode, it glows re

37、d. In the On mode (when the high voltage comes on) it glows green. If it does not turn green in the On mode, there is no high voltage present and the unit needs servicing. If the amp detects a fault in the power tube circuit, the high voltage is turned off and the LED flash- es between red and green

38、. This usually indicates a bad power tube. The amp will remain in this condition until the unit is turned off. 17. STANDBY: The Standby mode allows the tubes to warm or remain warm without high volt- age being applied to them. This extends tube life. During short periods of non-use, the amp should b

39、e put into Standby mode. When the amp is first turned on, it is automatically in Standby mode, regardless of the switch position. After approxi- mately 20 seconds, the amp is in the mode selected by the switch. 18. POWER: This supplies AC power to the unit. This switch must be turned off to reset th

40、e amp after a Fault condition. GRAPHIC EQ SECTION 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 clu

41、b, etc.) 2) For a completely different sound, make larger adjust- ments and only activate the EQ when you want a “sec- ond channel” sound (such as during bass solos). 19. FREQUENCY SLIDERS: These control the nine frequencies of the Graphic EQ section at the points indicated over each slider. 20. LEV

42、EL: This adjusts the level of the signal to compensate for boosts or cuts, or for a desired level change when using the Graphic EQ. 21. ACTIVE LED: This LED glows green when the EQ section is enabled by the proper combi- nation of Graphic EQ switch (15) and footswitch (35). It flashes red when the s

43、ignal gets close to clipping. -15dB PAD MUTEPEAK / MUTE ULTRA LO BRIGHT ULTRA HI GRAPHIC EQ MASTERTREBLEFREQUENCYMIDRANGEBASSDRIVEGAININPUTPOWERSTANDBY -12dB 0 +12dB -10dB 0 +8dB 40Hz90Hz 180Hz 300Hz 500Hz 1kHz2kHz4kHz 10kHzLEVEL ACTIVE / PEAK 148910111213171816523671415 192021 5 SVT-2 PRO Bass Ampl

44、ifier The Rear Panel 22. AC LINE IN: Firmly plug the supplied AC power cord into this socket, pushing it in until it is fully seated. Plug the male end of the cord into a grounded AC outlet. DO NOT DEFEAT THE GROUND PRONG OF THE AC PLUG! 23. FUSE: The fuse protects the amplifier from damage due to l

45、ine current faults and other con- ditions. If the fuse blows, replace it only with the same size and type as listed on the amplifier. 24. POLARITY: Place this switch in the position that provides the least electrical buzz from the unit. 25. BIAS SECTION: These controls and LEDs allow the user to pro

46、perly bias the power amp. 26. SLAVE OUT: This jack receives the same signal that is being sent to the power amp. It is useful for powering another amp (slave) from this units preamp. 27. PREAMP OUT: This jack carries the post- Master (13) signal. It does not break the path to the power amp. This sig

47、nal can be used to feed an external power amplifier, mixing console, or house PA system. 28. POWER AMP IN:This jack accepts a signal to be sent to the power amp and the Slave Out jack (26). It does break the path from the Preamp Out jack (27). This can be used as a post-Master (13) patch point. 29.

48、LEVEL: This control adjusts the level of the signal at the Balanced Out jack (31). 30. PRE/POST: This switch selects a direct out from the bass (Pre) in the OUT position and the preamp signal just before the Master (Post) in the IN position to be sent to the Balanced Out jack (31). 31. BALANCED OUT:

49、This XLR-type jack is the output as selected by the Pre/Post switch and adjusted by the Level control (29). This signal can be used to feed an external power amplifier, mixing console, or house PAsystem. 32. EFFECTS LOOP SEND: This is a post-EQ, pre-Master (13) patch point send jack. It does not break the path through the preamp. When using an external signal processor, connect the INPUT of the effect to this jack using a shielded instrument cable to send the signal to the effect for processing. 33. EFFECTS LOOP RETURN: This is a pre- Master (13) patch point ret