Coda 07x FET Preamplifier User manual

Coda
Brand
Coda
Model
07x FET Preamplifier
Category
Musical Equipment
Type
User manual

Coda 07x FET Preamplifier is a precision device designed to provide the listener with unmatched sound quality, design, and construction. Its circuitry is the result of an advanced and complete design process combining innovation and proven fundamentals, avoiding both the limitations of total adherence to convention and the flaws resulting from inappropriate applications of clever circuit gimmicks. The FETs used in the circuitry consistently have the edge in voltage gain, low noise, low interaction, and interface applications.

The preamplifier's impedance isolation and matching is derived from FETs, which have extremely high input impedance (about 10 megaohm - similar to vacuum tubes). The FET "senses" the audio signal without drawing current from the source, eliminating complex interactions with the source, allowing maximum performance from each system element, and greatly reducing the chance of cable characteristics altering the sound.

Coda 07x FET Preamplifier is a precision device designed to provide the listener with unmatched sound quality, design, and construction. Its circuitry is the result of an advanced and complete design process combining innovation and proven fundamentals, avoiding both the limitations of total adherence to convention and the flaws resulting from inappropriate applications of clever circuit gimmicks. The FETs used in the circuitry consistently have the edge in voltage gain, low noise, low interaction, and interface applications.

The preamplifier's impedance isolation and matching is derived from FETs, which have extremely high input impedance (about 10 megaohm - similar to vacuum tubes). The FET "senses" the audio signal without drawing current from the source, eliminating complex interactions with the source, allowing maximum performance from each system element, and greatly reducing the chance of cable characteristics altering the sound.

OPERATION MANUAL
Preamplifier07x
CARE&HANDLING
WARRANTY REGISTRATION
WARRANTY & DISCLAIMER
3
6
9
8
4
INSTALLATION CONNECTIONS
DETAILED INSTALLATION
DESIGN PHILOSOPHY
10
TECHNICAL DATA
2
INTRODUCTION
11
1
SAFETY PRECAUTIONS
2
INTRODUCTION
1
SAFETY PRECAUTIONS
!
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.
!
2
INTRODUCTION
Thispreamplifierisaprecisiondevice,designedinanefforttoprovidethelistenerwith
unmatchedsoundquality,design,andconstruction.Inordertooperateyourpreamplifier
properlyandtorealizeallofthecapabilitiesofthe07XPREAMPLIFIERwerecommendthat
youreadthisentiremanualcarefully.
3
INSTALLATIONCONNECTIONS
Illustratedbelowistherearpanelofthe07X. Theconnectionsarestandardandtypicalofany
audiopreamplifier. Anyunknownfeaturesshouldbeadequatelyexplainedbythefunction
descriptionsonthefollowingpage.
Bothsetsofbalancedreceptaclesontheleftsideareidenticalstereooutputssuitablefor
connectiontomultipleamplifiers. Thetwosetsofbalancedreceptaclesontherightsideare
separateinputchannels.
Makesureduringinstallationthatthe ACpowerconnectionsareinterruptedtothe
preamplifierandallothercomponentsareoff.Whilethediagrammaybeselfexplanatory,we
stronglyrecommendthatyoureadthefrontpaneldescriptiononthefollowingpageforuse
instructions.
4
DETAILEDINSTALLATION
1. Thefirstfourbuttonsselecttheinputsource.
2. ThePROCESSORbuttonswitchesinanaudioprocessor(surroundsound,equalizer,etc.)
3. TheMONObuttoncombinestheleftandrightaudiochannels.
4. TheBYPASSbuttonwillcausethegaintodroptounity,bypassingthenormal12dB
standardgainofthe07x.
5.Volumeandbalancesettingisindicatedbythedecibel(dB)display.
FORVOLUME ADJUSTMENT: Thevolumedisplayshows"relative"volumelevel.Whenthe
displayreads"99"thereisnodecibelattenuation,"00"isthemaximumdecibelattenuation,
andlevelchangesoccurin1dBincrements.
FORBALANCE ADJUSTMENT:Inthewindownexttothenumberdisplayarethreeindicator
LEDs,MAIN,LEFT,andRIGHT.IntheMAINmode(blueLED)thedisplayreadoutshows
volumelevel.IntheLEFT mode(whiteLED)thedisplayreadoutshowsleftbalancelevel.In
theRIGHT mode(redLED)thedisplayreadoutshowsrightbalancelevel.Inadditionthe
displaywillflashonandowhenthevolumeismuted.
Whenadjustingindividualchannellevelforbalancingpurposes,thedisplayshows"actual"
decibellevel.Inotherwords,thedefaultvalueof"0"ontheLEFT orRIGHT channelmode,
showsthatthechannelisnotattenuated. A valueof"99"showsthechannelis-99dbbelow
fullvolume.
6. TheVOLUME/BALANCEiscontrolledbytheopticalencodercontrol.Clockwiserotation
increaseslevel,counterclockwiserotationdecreaseslevel.Leftbalanceisselectedby
pressingtheknobonce,andadjustingthelevel.Rightbalanceismadebypressingtheknob
again,andadjustingthelevel.Pressingtheknobonceagainwillbringitbacktobeinga
volumecontrol.
7. ToadjusttheGAINofeachinput(tomatchthelevelsofallthecomponentsinthesystem),
pressandholditsselectorbuttonwhileyoupressthevolumeknob-thenreleasethemboth.
Thedisplaywillswitchto"00"andtheselectedinputlightwillflash.
Turnthevolumeknobclockwisetoraisetheinputgainupto+18dborturncounterclockwise
toreducetheinputlevelupto-99db(notethatthesigns"-"or"+"arenotdisplayed).
ToswitchbacktoMAIN,pressanybuttonortheknob,orwaitfifteenseconds.
REMOTEOPERATION
The07xcanbeoperatedbyremotecontrol. TheMX-450LearningRemoteis
includedwiththeamplifier.ForinstructionsonusingtheMX-450itselfseethe
onscreenmanualincludedintheremote.
5
DETAILEDINSTALLATION
6
DESIGNPHILOSOPHY
ThecircuitryusedintheFET PREAMPLIFIER07xistheresultofanadvancedandcomplete
designprocesscombininginnovationandprovefundamentals. Thisprocessavoidsboththe
limitationsoftotaladherencetoconventionandtheflawsresultingfrominappropriate
applicationsofclevercircuitgimmicks.
ImpedanceisolationandmatchingisderivedfromFETs.Whilecarefuldesigncanyieldgood
resultsfromanydevicetype,FETsconsistentlyhavetheedgeinvoltagegain,lownoise,low
interaction,andinterfaceapplications.
FETsareinherentlytransconductancedevices,meaningthataninputvoltagecontrolsan
outputcurrent.Unlikeconventionaltransistors,FETshaveextremelyhighinputimpedance
(about10megohm-similartovacuumtubes). TheFET "senses"theaudiosignalwithout
drawingcurrentfromthesource. Thiseliminatescomplexinteractionswiththesource,allows
maximumperformancefromeachsystemelement,andgreatlyreducesthechanceofcable
characteristicsalteringthesound. TheabsenceofinputcurrentinFETsallowshighbias
currentsforlinearityandspeedwithoutsacricingDCparameters.
Noiseiskeptlowbymultipleparallelingofinputdevices,carefulselectionofcircuit
impedances,andpre-screeningofdevices. TheClass A complimentaryfollowersusedto
drivethepreamplifieroutputareofsuchspeed,linearity,andlowoutputimpedancethatno
feedbackcorrectionisrequiredorused. Theadvantageofthisisthatthecircuit'sperfect
stabilityandtransientresponsearepreservedintoawiderangeofdicultandunpredictable
loads.Variationinsound,whichcouldoccurthroughinteractionswithinterconnectcablesand
othersystemelementsarethusavoided.
Untilrecently,perfectvolumecontrols(attenuators)didnotexist. Thisisbecause
conventionalstereopotentiometershaveseriouschannelmistracking(20%typically),
becomenoisywithage,wearout,andhavepoorresolutionoflevel-particularlywhen
operatedbyamotorasrequiredforremoteoperation.Inanattempttosolvetheseproblems,
manymanufacturershavebeenusing"switchedattenuators",whicharediscrete,resistor
laddersbuiltonrotaryswitches.Butwhiletheseeliminatechannelmistracking,theyintroduce
newproblems,includinglimitedresolution,steppingtransients,andcannotbeoperated
remotely. Andtheystillwearout.
Theylimitresolutionbecausethemostcontactsavailableonrotaryswitchesarethirty-one.
ThisrequirestwoorthreedBstepsinordertogetenoughrangeoutoftheattenuator,which
isn'tafineenoughresolutionformostlisteners.Switchedattenuatorsalsointroduceswitching
transients(a"click"or"pop")eachtimetheychangepositions.
Thisnoisecomesfromtwosources. Thefirstismechanicalnoisefromtheswitchitselfasits
ball-detentmechanismmovesfromdetenttodetent.Butamoretroublesomesourceisthe
voltagedifferencecausedbythechangeinthemusicalwaveformduringthetimeittakesthe
switchtomovefromonepositiontothenext. Thegreaterthevoltagedifference,thelouder
thetransient.
7
DESIGNPHILOSOPHY
1.Finishes- Allexteriorandinteriormetalpartsareanodized.Whilepaintmaybemore
impactresistant,theanodizedsurfaceismoreresistanttosolventsandpreventscorrosion.
Moreover,theanodizedparts'appearancecanbeenhancedbyeithergrainingorbead-
blastingthesurface.
2.CircuitBoard-Circuitboardsarefiberglassepoxywithgoldplatingoveratin/nickelbarrier.
Thisgoldlayerwillnotcorrode,whilethebarrierplatepreventsthegoldfrommigratingtothe
lowercopperlayeranddetractingfromitsappearance.
3.Resistors- Allarehighreliabilitymetalfilm1%resistors.
4.Capacitors- Allcapacitorsareofhighquality. Theonlyelectrolyticsusedareinthepower
supplywherelargenumbersprovideenormousfilteringcapacitanceforthesupply.
5.Semiconductors- Therearenointegratedcircuits(IC)tobefoundinthecircuitpath.Very
highqualitydualFETsaretheonlysourceofvoltagegainandwereselectedfortheirsuperb
noiseperformanceandprecisionmatching. Theremainingsemiconductorsarealsoofvery
highquality,eachpossessingparametersideallysuitedforthespecificapplication.
6.Connectors-CodaemploysastandardRCA configurationwithagoldplatedcase. The
balancedconnectorsareNeutriksfromSwitzerland.
7.Wire- Allsignalwirehasbeeneliminatedwheneverpossible.Wherewireisused,Coda
employssilverplatedcopper,141strand,18gaugewirewithasiliconeinsulation.
8
TECHNICAL DATA
FrequencyResponse
Distortion
Gain
MaximumOutput
Noise
InputImpedance
OutputImpedance
Crosstalk
PowerSupplySpecifications
Dimensions
:
-3dB@5Hzto200kHz
:
<.005%from10Hzto40kHz@5Vpeakinto600ohmsorhigher,shuntedby1000pForless.
:
12dBplus0-18dBvariableperinputin1dBsteps.UnitygainwhenBypassfeatureis
enabled.
:
10Vpeak
:
<110dBA referencedto1Voutput
:
20kOhmsbalancedorunbalanced
:
50Ohmsnon-reactiveunbalanced
100Ohmsnon-reactivebalanced
:
90dB@20kHz
:
Regulatedsupplywithshieldedtoroidaltransformerand19,800uFoflow-ESRcapacitance
andcapacitorssmoothingtheregulatoroutputs.
:
Height: 2.5”Faceplate,2.85”Overall
Width: 18”Faceplate,17.0”Chassis
Depth: 9.75”Overall
Weight: 14.0lbsShipping
PowerConsumption: 10Watts
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Codaproduct,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.
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.
Theproducthasbeentransferredtoathirdparty.Inthiscasethewarranty
Iisvalidfor5yearsfromdateofmanufactureasdeterminedfromtheserialnumber
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:
12
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
fax
+01916.383.3653 +01916.455.3653
CODA.CC
[email protected]
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Coda 07x FET Preamplifier User manual

Coda
Brand
Coda
Model
07x FET Preamplifier
Category
Musical Equipment
Type
User manual

Coda 07x FET Preamplifier is a precision device designed to provide the listener with unmatched sound quality, design, and construction. Its circuitry is the result of an advanced and complete design process combining innovation and proven fundamentals, avoiding both the limitations of total adherence to convention and the flaws resulting from inappropriate applications of clever circuit gimmicks. The FETs used in the circuitry consistently have the edge in voltage gain, low noise, low interaction, and interface applications.

The preamplifier's impedance isolation and matching is derived from FETs, which have extremely high input impedance (about 10 megaohm - similar to vacuum tubes). The FET "senses" the audio signal without drawing current from the source, eliminating complex interactions with the source, allowing maximum performance from each system element, and greatly reducing the chance of cable characteristics altering the sound.

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