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  6. 61 Mono Amplifier

Coda 61 Mono Amplifier User manual

  • Hello! I have thoroughly reviewed the user manual for the CODA Amplifier 61.0. This document provides detailed information about the device including its features, installation, and maintenance. The amplifier is designed with high quality components and a robust power supply. It features a precision bias technique and high current output stage and has balanced and unbalanced inputs. I'm ready to answer your questions about the amplifier.
  • What should I do if the fuse in my amplifier blows?
    What is the purpose of the bias control button?
    What kind of cleaning products can be used on the exterior?
    What is the warranty period for the amplifier?
OPERATION MANUAL
AMPLIFIER 61.0
1
2
3
10
SAFETY PRECAUTIONS
INTRODUCTION
DETAILEDINSTALLATION
DESIGNPHILOSOPHY
TECHNICAL DATA
CARE&HANDLING
WARRANTY &DISCLAIMER
WARRANTY REGISTRATION
8
5
6
7
HIGHBIAS
MONO
AMPLIFIER
61.0
OUTPUT- OUTPUT+
BIAS RANGE
G-300W
Y-5W
!
CAUTION
CAUTION
WARNING
WARNING
1
SAFETY PRECAUTIONS
CAUTION -
-
-
-
-
CAUTION: TOPREVENT ELECTRIC
SHOCK,DONOT REMOVECOVER.
NOUSERSERVICEABLEPARTS
INSIDE,REFERSERVICING TO
QUALIFIEDSERVICEPERSONNEL.
THISSYMBOL IS TO ALERT YOUOF
THEPRESENCEOFUNINSULATED
DANGEROUSVOLTAGEWITHIN THE
UNIT'SENCLOSURE THAT MAY BEOF
SUFFICIENT MAGNITUDE TO
CONSTITUTE A RISKOFELECTRIC
SHOCK.
THISSYMBOL ISINTENDED TO ALERT
YOUOF THEPRESENCEOF
IMPORTANT OPERATING AND
MAINTENANCEINSTRUCTIONSIN THE
LITERATURE ACCOMPANYING THE
UNIT.
WARNING:TOPREVENT FIREORSHOCKHAZARD,DO
NOT EXPOSE THISUNIT TORAINOR
MOISTURE. TO AVOIDELECTRICAL SHOCK,DO
NOT OPEN THEUNIT.REFERSERVICING TO
QUALIFIEDPERSONNEL.
Neverinstallorremovethepowercordfromthechassis
unlessithasbeendisconnectedfromthe ACpowersource
first.
Neverpullonthepowercordwhenremovingitfroman AC
powersource.Graspitbytheplug.
Donotleavethepowercordconnectedtoan ACpower
sourceunlessitisconnectedtotheunit.
Itisrecommendthatduringextendedperiodsofnon-use
thattheunitspowercordbeunpluggedfromits ACpower
source.
Routethe ACpowercordsothatitwillnotbedamagedor
walkedon.
!
Thankyouforpurchasingthe AMPLIFIER61.0
Thisamplifierisaprecisiondevice,designedinanefforttoprovidethelistenerwith
unmatchedsoundqualitythroughsuperbdesignandconstruction.
Althoughitsoperationisfairlysimple,inordertooperateyouramplifierproperlyandto
realizeallofthecapabilitiesofthe61.0werecommendthatyoureadthisentiremanual
carefully.
INTRODUCTION 2
DETAILED INSTALLATION 3
I.Connections
Theconnectorsandcontrolsareclearlymarkedonthebackpaneloftheamplifier.Notethe
correctleftorrightchannelorientation. Thefunctionandchannelmarkingsontherearpanel
correspondtothefrompanelcontrolsandtheirsignalpaths.
1. Theunbalancedandbalancedinputsshouldbeattachedtotheappropriateunbalanced
andbalancedoutputsofapreamplifiereitherdirectlyorthroughacrossoverorprocessor,as
appropriatetotheapplication.
2.Theleftoutputandrightoutputshouldbeattachedtotheleftandrightspeakers
respectively.
WARNING:PleaseensurethatthepowerswitchisturnedOFFwhileyouareconnecting
theamplifier.Connectingordisconnectingcableswhiletheamplifierispoweredoncould
causedamagetoyourspeakers.
3. The AClineinputshouldbeconnectedtoan ACoutletwiththepowercableprovidedwith
theamplifier.
4. Thefuseandvoltageselectorunithousesa5x20mmslow-blowfuseandavoltage
selectorcartridge.Ensurethatthevoltage,visiblethroughasmallwindownexttothe AC
input,issettotheappropriatevoltageforyourcountry.Whenchangingvoltages,ensurethat
thepowercableisdisconnectedfromtheamplifier.
NOTE:Ifthefuseinyouramplifierblows,contactaCodadealerorcallCodadirectlybefore
attemptingtousetheamplifieragain.
5. Thepowerswitchcanusuallybeleftonwhentheamplifierisfunctioningcorrectly.Withthe
biasdisabledtheamplifierwilldrawnegligiblecurrentandcanthusbeleftin “standby”
indefinitely.
2
3
4
6
8
USE ONLY SPECIFIED FUSE TYPE
NEG. OUTPUT
POS. OUTPUT
2
5
1
PUSHPUSH
12 2
DETAILED INSTALLATION 4
II.FrontPanelControlFunctionsandIndicators
1. Thebiascontrolbuttonenablesanddisablestheamplifierbytogglingthebiaswhich
enablestheamplifier’soutputsandswitchingshuntingrelaystomutetheinput.
2. TherailstatusLEDsindicatethatthepositiveandnegativeamplifierrailsareenabledand
working.
Note:Ifapowerinterruptionoccurstothesystemtheamplifierwillpoweronwiththebias
off.Pressthebiasbuttontoresumeuseoftheamplifier.
HIGHBIAS
MONO
AMPLIFIER
61.0
OUTPUT- OUTPUT+
BIAS RANGE
G-300W
Y-5W
5
DESIGNPHILOSOPHY
I.DesignPhilosophyand Approach
Thesubtletyofthedesignprocessatthislevelofperformancemakesitimpossibletoeasily
explainalloftheadvantagesinherentinthe61.0.However,wepresenthereanoverviewto
giveyouanunderstandingofsomeofitsuniquefeaturesandanideaofthelistening
experienceyoucanexpect.Oftenaparticulartechniquehasnumerousunrelatedadvantages
andpossibilities.Wemakeeveryefforttoexploittheseadvantageswiththefinalresultbeing
anamplifierthatperformsbetterthanthesumofitsindividualfeaturessuggest.
ThetopologyandcomponentselectionisbuiltonthefoundationestablishedbytheCoda
System100.Balancedinterconnectionsareprovidedtotakeadvantageoftheirgreaternoise
rejection.Differentialvoltagegainthroughoutprovidesexceptionalrejectionofexternalnoise
andcontributestotheinherentDCstabilityofthecircuit. Thisallowsdirectcouplingwithout
servocircuitry. Theunitalsousesoutputfollowersoperatingwithoutfeedback.
Excellenthighfrequencydesignensureslinearoperationathighspeed,andtranslatesintoa
sonicreproductionwhichisextremelytransparentincharacter. Thepowersupplytakesa
verydirectapproachtohighperformance.First,topqualitytoroidaltransformersandover
280,000uFofcapacitancewithverylowESRandinductanceareused.Foroptimum
performanceandreliabilityallcircuitryremainscontinuouslypowered.
ThespecificationsareconsistentwithwhatwouldbeexpectedInahighcurrentamplifier
design.Inthisdesign,however,anunusualdegreeofattentionhasbeenpaidtosonically
meaningfulparameters.
Forexample,thecurrentstageiscapableofproducingpeakcurrentsinexcessof100
Ampereswithadegreeoflinearityandspeedunmatchedbyotherdesignsproducingonlya
fractionofthiscurrent. Thisisachievedbytheimplementationofseveraldistinctcircuit
features.
Extremelywidebandwidthtransistorsareusedintheoutputstageinsteadoftheusual TO3
devicesusedinotheroutputdesigns.Eachchanneluses28individualoutputtransistorswith
acombinedpowerratingof1500Wattsand120 Ampereswithabandwidthof50Mhz.
The61.0usesbiasvoltagesandcomponentvalueswhichhavebeenspecificallyselectedto
produceaprecisiontransitionwithnoabruptchangesindistortionoroutputimpedance. This
“PrecisionBias”techniqueyieldsseamlessperformanceregardlessofthecomplexityofthe
loadimpedanceandisparticularlyeffectiveateliminatingIMdistortionwhichoftenoccursin
theseinstances.
6
DESIGNPHILOSOPHY
I.DesignPhilosophyand Approach(continued)
Tomaintain “PrecisionBias”requiresanadvancedbiascircuitthatmusthaveaveryhigh
degreeofstabilityunderawiderangeoftemperaturesandloadconditions.Mostamplifier
biasnetworksareofsuchhighimpedanceandpoorthermalregulationthatattheextremes
ofoperation,biascurrentsareineffectivelycontrolled. Advancedtrackingtechniquesusedin
the61.0resultinabsolutecontrolofbiascurrentsunderallconditions.
Themainpowersupplyoftheamplifierconsistsofa3000VA transformerwithindependent
rectifierstoisolatethechannelsfromoneanother.280,000uFoftotalcapacitanceprovide
effectivefilteringofall ACripple.
Theseattributesresultinanamplifierofsuchextremelinearityandbandwidththatnooverall
feedbackcorrectionisrequiredorused.Oneadvantageofthisisahighdegreeofimmunity
frominteractionswithloadsorcablesandasuperiortransientresponse. Anextremelylow
nonreactiveoutputimpedanceismaintainedwellbeyond20,000Hz.theresultinguniform
dampingfactorisnotcommonlyfoundinotherdesigns.
Thechassisofthe61.0isconstructedofmachinedaluminummilledtoveryclosetolerances
yieldingtheseamlessappearancecharacteristicofpreviousproductsfromCoda. Aswithall
high-poweramplifiers,heatdissipationisimportant. The61.0usessixmassivealuminum
heatsinkswithoutfansforefficient,noiselessandcleanthermalrelief. Thethermalcoefficient
ofthe61.0heatsinksisoneofthelowestandmosteffectiveintheaudioindustry.
7
DESIGNPHILOSOPHY
II.MaterialQuality
Theamplifier’schassisismadefrommachinedaluminum. Allexteriormetalpartsare
anodizedorpowdercoatedfordurability.
Printedcircuitboardsarefiberglassepoxywithgoldplatingoveratin/nickelbarrier. Thegold
layerwillnotcorrode,whilethebarrierlayerpreventsthegoldfrommigratingtothelower
copperlayer.
Allresistorsareprecisionmetalfilm;1%tolerancefor1/4-wattand5%tolerancefor1-watt.
Capacitorshavebeeneliminatedwhereverpossible.Noelectrolyticcapacitorsareused
exceptinthepowersupply,whereseveralhigh-capacitanceelectrolyticsprovideoutstanding
filteringofthesupplyoutput.
Allsemiconductordevicesareofveryhighgrade.Voltagegainisaccomplishedwithan
extremelyhigh-quality,matcheddualFET,chosenforit’sexceptionallylownoise
characteristics.
Allaudioinputandoutputconnectorcontactsaregold-plated,andXLRreceptaclesare
manufacturedbyNeutrikofSwitzerland.Wireisusedaslittleaspossibleinthesignalpath-
onlytoconnecttheRCA jacksandspeakerterminalstothecircuitboard-andwhatisusedis
141-strandsilver-platedcopperwithsiliconeinsulation.
8
TECHNICAL DATA
BRIDGEDMONO
RatedPower 1000Wattsclass AB@4Ohms
500Wattsclass AB@8Ohms
FrequencyResponse: DCto-3dB@100kHz
Distortion: <.02percentfrom10Hzto20kHz@ratedpower
Gain: 32dB
MaximumCurrent: >100 Amperespeak
Noise: -126dBreferencetoratedoutput
InputImpedance: N/A unbalanced/10kOhmsbalanced
OutputImpedance: .06Ohmsfrom20Hzto20kHz
POWERSUPPLY
Transformer Type: Multi-tap,multi-windingtoroidal
TransformerRating: 3kVA
PowerFiltering: 280,000 μF
DIMENSIONS
Height: 7”Faceplate,7.75”Overall
Width: 18”Overall
Depth: 19”Overall
Weight: 110lbs.,115lbs.Shipping
PowerRequirement: 1.5KWattsmaximumatratedpower
9
CARE&HANDLING
Theinterioroftheunitrequiresnospecialcare.Ifitbecomesnecessarytocleantheexterior,
asimpledustingmaybeallthatisrequired.Ifacleanerisnecessary,anydilutecommercial
ammoniabasedproductwillbeappropriate.NEVERuseanyabrasiverags,cleanersor
chemicalsolventsonCodaproducts.
Whenhandlingtheunit,takecarenottomarthealuminum. Aluminumisamediumhardness
metalandcanbescratchedbythehardertoolsteels.
Avoidexposingtheunittodirectsunlight,andkeepitawayfromsourcesofintenseheat.
Donotthrowawaythecartonorassociatedpackingmaterial. Theyareidealifyouneedto
packtheunitformovingandintheunlikelyeventthatservicingisneeded,theywillbe
necessaryforsafeshipment.
Besuretoprovideadequateinsurancewhenshipping.
10
WARRANTY &DISCLAIMER
I.Warranty- Anyfailureofthe Amplifier61.0,hereafterknownastheproductororiginal
product,tooperateortomeetspecifications,applicableattimeofmanufacture,duetoa
manufacturingdefectorcomponentfailure,willbecorrectedbyCoda Technologieswithout
chargeforpartsorlabor,foraperiodoftenyearsfromdateoforiginalpurchase.Coda
Technologieswillprovideforsurfacetransportationtoandfromthefactoryforaperiodofone
yearfromdateoforiginalpurchase.
II.Procedure-IftheproductshouldrequireserviceunderwarrantycontactCoda
Technologiesatthelocationonthebackcoverofthismanualforshippinginstructions.
ProductspurchasedoutsideoftheUnitedStateswillbecoveredbythewarrantyconditions
extendedbytheimportingdistributorwhichmaydifferfromthosegivenabove.
III.ExclusionofCoverage-Coda Technologiesisnotobligatedtoservicetheproductin
certainconditions,asaccordingtothefollowingsubsections.
a. Theproducthasbeendamagedthrough:
i.operationnotinaccordancewiththeinstructionsinthismanual
ii.abuse,tampering,modificationoraccident
iii.serialnumberdefacement
b. Theproducthasbeentransferredtoathirdparty.Inthiscasethewarrantyis
fiveyearsfromdateofmanufactureasindicatedbytheserialnumber.
c. TheproducthasbeentransportedoutsideoftheUnitedStatesof America.
IntheseconditionsanyservicewillbemadeatCoda Technologiessoleoption.
IV. TotalLossandReplacement-Iftheproductissubmittedforserviceduetoasevere
malfunctionwhichhascauseddamagesufficientenoughtomakearepairattemptinfeasible,
theproductwillbereplacedwithanotherunitofequalorsuperiorspecifications.Coda
Technologiesproductlineisfrequentlyupdatedandchanged,andthespecificmodeland
versionoftheoriginalproductmaybediscontinuedatanytimewithoutnotice.Inthiscaseno
guaranteesaremadethatthereplacementunitwillbevisuallysimilartotheoriginalproduct.
V.SubjectiveDifferences-Noguaranteeismadethattheproductwillperformtoany
specificationsthatcannotbemeasuredandconfirmedwithprecisionaudioanalysis
equipment.Coda Technologiesisonlyobligatedtomakerepairswhichwillbringtheproduct
intocompliancewiththespecificationsstatedinthismanual.
VI.UnnecessaryService-Inallconditions,iftheproductissubmittedforserviceandfound
tobeoperatedwithoutfaultandwithinspecifications,shippingchargeswillbebilledtothe
customer.
Thiswarrantygivesyouspecificlegalrights. Youmayhaveotherrightswhichvaryfromstate
tostate.
Disclaimer-Coda Technologiescannotbeheldresponsibleforanydamagecausedbytheir
products,includingbutnotlimitedto:
a.DamagetospeakerscausedbyfailureofaCoda Technologiesproducttomute
ordisableitselfasexpectedordescribedinitsmanual.
b.DamagecausedbyconnectingaloadtoaCoda Technologiesproducthaving
animproperimpedanceasdescribedintheproductsmanual.
c.Damagecausedbydefectsindesign,constructionorcomponentquality.
11
WARRANTY REGISTRATION
FillinthisregistrationsheetandfaxormailittoCoda Technologiestoensureyouareinour
warrantysystem. Thiswillfacilitatewarrantyserviceshoulditbecomenecessary.
Itisrecommendedthatyouretainacopyofthisformforyourownrecords.Coda
Technologies’addressandfaxnumberarelocatedonthebackofthismanual.
MODEL DESIGNATION:
SERIAL NUMBER:
DATEOFPURCHASE:
PLACEOFPURCHASE
OWNERINFORMATION
NOTES:
Name:
Address:
City: State: Zip:
Phone:
Name:
Address:
City: State: Zip:
Phone:
7850CUCAMONGA AVENUE#34
SACRAMENTO,CA 95826USA
Phone
Onthewebat
emailusat
+01916.383.3653
CODA.CC
[email protected]
/