DB 751 - Guitar amp Aguilar - Free user manual and instructions

USER MANUAL DB 751 Aguilar

Page 1 The DB 751 Bass Head features a combination of raw power and rich tone that continues the legacy of the DB 750. The DB 751 is a groundbreaking hybrid with a discreteMosfetoutputsectionanda3-tubepreamp. While maintaining the legendary sound of the DB 750, the DB 751 features improvements in the EQ section, a better control layout, detachable rack ears, and thermally controlled fans. This amp has the headroom to bring your tone to life no matter what kind of music you are playing. For sound clips and sample settings be sure to visit our website at: www.aguilaramp.com. EnglishWARNING: Toreducetheriskofreorelectricshock,donotexpose equipmenttorainormoisture.AguilarAmplicationassumesno responsibility for any damage or injury that results from improper use or service. CAUTION: RISK OF ELECTRIC SHOCK! DO NOT OPEN! There are no user serviceable parts inside of this product. This is a high voltage device, and internal voltages can be lethal. Any and all work should be performedbyqualiedpersonnelonly. In order to ensure safe operation of the device, please follow these guidelines:

1. Read the instruction manual in its entirety before trying to operate the

equipment. The manual should be kept for future reference.

2. Observe all safety precautions, warnings and instructions noted in this manual.

3.Alwaysunplugtheamplieroutofthewallsocket,beforecleaning.Useonlydry cloth. Do not use aerosols or solvents.

4. Keep the device away from sources of water such as pools, bathtubs, and sinks,

anddonotexposeittorainorsplashesofwater.Donotplaceobjectslledwith uidonthedevice.

5. Vents are provided for heat dissipation on the sides, and at the rear of the

amplier.Maintainatleasta2”(5cm)spacearoundtheseventstoprovide sufcientventilation. 6.Keeptheamplierawayfromsourcesofheatandopename,suchasheaters, radiators, stoves, lit candles, etc.

7. Make sure that the power cord is intact before plugging it into the unit. Do not

use cords with visible damage to its insulation, or connectors. 8.Thisdeviceisequippedwithasafetyfeaturethatrequirestheuseofthethree- pin grounding power plug. Do not defeat the safety purpose of the grounding plug.Ifprovidedplugdoesnottyouroutlet,consultanelectricianabout replacing an obsolete power outlet. 9.Useonlyaccessorieslistedinthismanual,orinotherwayspeciedbythe manufacturer. 10.Donotinstallthisamplieroncartsorothermovingobjects. 11.Whenamplierisinuse,routethepowercableinsuchwaythatwillpreventit from being stepped on, tripped on, pinched or damaged in any other way. 12.Donotusethisdevicewithwall/ceilingmountsnotspeciedbythe manufacturer. 13.TocompletelydiscontenttheequipmentfromtheACmains,disconnectthe powercordfromtheACreceptacle.Foradditionalprotection,unplugthe device during light storms, or when not used for long periods of time. 14.Nouserserviceablepartsinside.Referservicetoqualiedservicepersonnel.If theunitwasexposedtoliquid,extensiveheatorre,orsustainedamechanical damage of any kind, do not attempt to operate it. Disconnect the unit from the walloutlet,andconsultqualiedservicepersonnel.

Safety Instructions Page 2Specications: Power Output: 975 watts @ 2 ohms, 750 watts @ 4 ohms, 400 watts @ 8 ohms Preamp Section: Three 12AX7s Power Section: 12 complimentary lateral MOSFETs Transformer: CustomAguilartoroidalpowertransformer. EQ Section: passivetonestackwithactivemidrangeelement,bass:+12/-12 @40Hz;midrange:+12/-12@750Hz;treb:+12/-7@4kHz Deep Switch: Adds5dBofbroad-bandboostat30Hz Bright Switch: Adds5dBofbroadbandboostat5-7kHz Effects Loop: Send is push/pull for line or instrument level; Return is push/pull for parallel or series operation Inputs: One1/4”inputjackwithanactive/passiveswitch Outputs: Two Neutrik Speakon speaker outputs, Jensen XLR balanced output(-32dB)withapre/postEQswitchandagroundliftswitch. Tuner out. Cooling: High quality whisper fans with thermal speed control Dimensions: 17”Wx14”Dx5.25”H Rack Size: Three Spaces, Includes detachable rack ears Weight: 42 lbs Warranty: Ten Year Limited Optional: Footswitch,TolexHeadcasesinDBseriescolors,Rackbag Front Panel Features: Input: -6 dB Switch: Insertsa–6dBpadinthesignalpathtoallowexibilitywhen adjusting the gain for a bass with very high output Gain Knob: Controlsthegainofthepreampsection Bright Switch: Adds5dBofbroadbandboostat5-7kHz Treble Knob: +12/-7dB@4kHz. Midrange Knob: +12/-12@750Hz Bass Knob: +12/-12@40Hz Deep Switch: Adds5dBofbroadbandboostat30Hz Master Knob: Controlsvolume Clip Light: Flashesifthepreampisclipping.Turndowneitherthe“Gain”, theEQ,or“Master”volume.FX Send: Sendsthesignaltoyoureffectsunits.Connecttheinputofyour effects unit to this jack FX Return: Returnsthesignalfromyoureffectsunitstotheamplier. Connecttheoutputofyoureffectsunittothisjack. Effects Loop: The“Send”knobispush/pullforselectinglineorinstrumentlevel. Thisallowsyoutouseastudioeffectsunit(linelevel)orastomp box(requiresinstrumentlevel)intheFXloop.Adjusttheamount of“Send”soastogetmaximumperformancefromyoureffects unitandthe“Return”togettherightamountofeffectedsignal. The“Return”knobispush/pullforparallelorseriesoperation. Inparallelmode,theeffectedsignalismixedtothedrysound.In series mode, the effects in the loop will process the entire signal. The amount of effects can be adjusted with the return knob. If you pull the return knob out for series operation without any effects plugged in the loop, the loop will be open and no sound will result. XLR Balanced Output: UsethePre-EQsettinginaconcertsituationwherethesound engineeristakingasignalintothehouse-mixingconsole.The engineer is now getting their feed before the preamp stage, which allows them to use appropriate EQ for the venue. The EQ on stage will still be controlled by your settings. If the engineer wantsyourEQsettingsincludedinthemix,setthecontroltoPost EQ and your settings on stage will be sent to the house. TheD.I.outputis–32dB.Thislevelisthecorrectoutputfora signalgoingintothepreamponamixer.Ourbalancedoutput uses the highest quality Jensen output transformer. If you hear any ground noise, change the position of the ground lift switch under the output. Footswitch: UsetheoptionalAguilarfootswitchtomutethesignalforsilent tuning. Rear Panel: Speaker Outputs: TwoNeutrikSpeakonconnectorsareprovided.Use12gaugeor larger speaker cable for proper connections. Tuner out: This output sends the signal to your connected tuner. This output will still be active when you mute the DB 751. Page 4Diagnostic and Protection TheDB751isequippedwithaself-diagnosticandstatus/protectioncircuit. Uponpower-up,theunit’sbluestatusLEDwillblinkforapproximately45 seconds.Duringthistimeseveralcircuitparametersareveried,oral- lowed to become self calibrated.

1. The high B+ voltage to the preamp tubes is slowly ramped up, allowing

the tube heaters to warm up before full current is drawn by the valves. 2.DCoffsetattheamp’soutputismonitored.Onlyifnoneispresent (normalcondition),willtheunitproceedwiththeself-checkprotocol. 3.TemperatureontheMOSFETheatsinkischecked,andagainonlyif normal temperature is detected, will the status check continue.

4. If all the voltages, offsets, and temperature are in accordance with

factoryspecications,thentheamp’sinput,andoutputrelayswillbe energized. This will then cause the operate LED to illuminate and the status LED to stop blinking. The amp is now ready for normal operation.

5. The circuit continues monitoring the above parameters to protect both

the DB 751 and the speakers connected to the amp in the event of unit orusererror.ThiswillbeindicatedbythestatusLED’sblinking. 6.IfthestatusLEDcontinuesblinking,orstartsblinkingduringamplieruse, thisindicatesasystemfault.Theamplierrequiresservicinginorderfor normal operation to resume. Page 5Page 6 Limited Warranty AguilarAmplication’sDB751hybridbassampiswarrantedtotheoriginal owner for a period of ten years from the date of purchase against defects in materials and workmanship. * Tubes are covered by the warranty for a period of 90 days. Abuse, negligence, and normal wear and tear are not covered by the terms of this warranty. The warranty period starts from the date of purchase from an authorized Aguilar dealer. Please register your DB 751 for warranty by going to www. aguilaramp.comandselecting“OnlineRegistration”fromtheSupport menu. It is important to save your original sales receipt. You will be asked tosendacopywithyouramplier. Before sending your unit to Aguilar for repair, you must receive a return authorizationnumberfromus.Contactusviaphone,fax,oremail ([e-mail])withadescriptionoftheproblem.Wewill then issue to you a return authorization number. You are responsible for all shipping charges. You must ship the unit to us freight prepaid. We will return the unit to you freight collect. For safe shipment, the product should be shipped in its original packaging. If you nolongerhavethis,wecanarrangetosellyoureplacement-packing materials. AguilarAmplicationLLCisnotresponsibleforshippingdamage,eitherto orfromourservicecenter.Claimsmustbeledwiththecarrier. The only company authorized to perform work under this warranty is AguilarAmplicationLLCofNewYork,NY. *IfyoupurchasedyourDB751outsidetheUSA,pleasecontactyourlocal DealerorDistributorforyourcountry’sspecicwarrantyperiodandrepair procedure.