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L1500
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Allnic L1500 User guide

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  
ALLNICAUDIO
L‐1500LINESTAGEPREAMPLIFIER
OWNER’SMANUAL
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ALLNIC AUDIO L-1500 LINE STAGE PREAMPLIFIER
ThankyouforpurchasingthisAllnicAudioL‐1500LineStagePreamplifier. WearecertainyourtrustinAllnicAudioandHammertoneAudio,aswellas yourappreciationforthesoundofthishigh‐qualitydevice,willbe rewardedbyitsexcellentoperationforyearstocome.
PleasereadthisentiremanualbeforeyouconnecttheL‐1500Preamplifier totheothercomponentsofyoursystemandthewalloutlet.
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TABLEOFCONTENTS:
___________________________________________________________________ INTRODUCING THE L-1500 LINE STAGE PREAMPLIFIER 4
___________________________________________________________________ WHAT’S IN THE BOX? 5
___________________________________________________________________ SAFETY 5
___________________________________________________________________ CLEANING
Chassis Connectors 5 ___________________________________________________________________
INITIAL SET-UP Location, Location, Location Power Connection Inputs Outputs Phase Switch Remote Control 5 ___________________________________________________________________
INITIAL POWER ON 7 ___________________________________________________________________
OPERATION 7 ___________________________________________________________________
TUBES 8 ___________________________________________________________________
SPECIFICATIONS 8 ___________________________________________________________________
WARRANTY 9 ___________________________________________________________________
FIGURES 10
PleasereadaboutSAFETYbeforeyouattempttousetheL‐1500 Preamplifier‐wecareaboutourcustomersandtheequipment,andwe wantyoutoenjoythisproductforalongtime!
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INTRODUCINGTHEL‐1500PREAMPLIFIER
TheL‐1500isAllnicAudio’smid‐linepreamplifiermodel, justunderthetopofthelineL‐4000.LikeallAllnicAudio products,itusesPermalloy(Ironandnickelalloy)forits transformercores.AllnicisgratefultoMr.G.W.Elmenof WesternElectricforinventingPermalloyfortransformer coreuse,andinsodoing,providinganenormousservice torecordedmusiclistenerseverywhere. TheL‐1500hasthefollowingfeatures:
•
Singlegainstage–Asinglegainstagecircuituses onlyonetubeforamplification(“gain”).This reproducesapurer,moredetailed,morespacious andmoredynamicsoundthanmultigainstages.
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Lineoutputtransformercoupling–TheL‐1500is “transformercoupled”.Intubeampcircuitry,there aretwocouplingmethods;oneiscapacitorcoupling andtheotheristransformercoupling.Capacitor couplingisthetraditional,lowcostmethod.Itis somewhatstablebuttransfersonlyvoltage,not wattage(i.e.,notrealenergy).Withtransformer coupling,about90%ofrealwattageistransferred (thereisstillatransformerlossofabout10%of wattage–voltageisnotaffected).
Transformercouplingissuperiortocapacitor coupling.However,alltheadvantagesof transformercouplingdependonthequalityofthe transformerandonthechoiceoftubes.AllnicAudio manufacturesitsowntransformersanduseswhatit viewstobethebestcorematerial,Permalloy.Allnic Audio'sunprecedented,wide(16Hz‐75kHz,‐3db), lowdistortional,andultra‐flexible(upto50kHz squarewaveresponse)outputtransformerhelps AllnicAudiotorealizetheidealtransformercoupled preamplifier.Ofcourse,gaintubesarealsocarefully selectedforthreecriticalfactorsforfunctionwith thePermalloycoreoutputtransformers:highgm, lowinternalresistanceandhighmu.
• Constantandlowoutputimpedance–Oneofthe
benefitsoftransformercouplingisthatitfacilitates constantlowoutputimpedance.Lowoutput impedanceiscriticaltothedesignofagood preamplifier.TheL‐1500hasa150ohm(150Ω)constant outputimpedanceatallfrequencies.Incapacitor
coupling(C‐Rcoupling),a“cathodefollower circuit"isusuallyusedtoloweroutput impedance.Unfortunately,thismethodof loweringoutputimpedanceisaccompaniedby highdistortionandhasan"L"shapedoutput impedancecurve.Pleasecomparethetwographs below,especiallyforlowfrequencyresponse.
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Advancedtubetechnologyvoltageregulation‐For quieterandmoredynamicoperation,theL‐1500has anultrahighspeedautomaticvoltageregulation circuit,utilizingvacuumtubes.Thisalsoprotectsthe amplifyingtubesfromchangeintheAClinesupply andcopeswithanyabrupt,internalcurrentdemand.
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Newvacuumtubedampingtechnology–Allnic Audio’spatented"AbsorbGELtubedamper" technologypreventsharmfulvibrationsfrom reachingthesignal/gaintubesand,therefore, preventsmicrophonicnoisepropagationinthetubes. TheAllnicAudioAbsorbGeldampertechnology effectivelysolvesaproblemthatplaguesmosttube amplificationsystems.Providedothertube componentsdonotintroducemicrophonicnoiseinto yoursystem,withtheAbsorbGeldampingsystem, youwillenjoyadegreeoftransparentsoundthatwill surpriseandpleaseyou.
• Precisionattenuatorvolumecontrol–TheL‐1500
doesnotemployadigitalICvolumecontroloralow‐ costcarbonfilmvolumecontrolwithamotor.Allnic Audiohasdevelopedaprecisionoilclutched motorizedattenuator;theL‐1500hasno(±0db) channelunbalanceatanyvolumelevel.
• PureClassAoperation
• AsareallAllnicAudioproducts,theL‐1500isfully
RoHS(EUReductionofHazardousSubstances regulation)compliantinconstructionandmaterials.
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Output Impedance
Output Impedance
Frequency (Allnic LCR Output Impedance Curve)
Frequency (Traditional CR Type Output Impedance Curve)
WHAT’SINTHEBOX?
Pleasecheckthattheshippingboxcontainsthefollowing: 
One(1)AllnicL‐1500preamplifier–innatural
•
aluminumorblack,dependingonyourorder specification
•
One(1)powercord One(1)Owner’sManual
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Note: 
1)
2)
TheL‐1500shipswiththetubesinstalled. TheL‐1500willworkwithmostIECtype aftermarketpowercords.Ofcourse,onlyyoucan determinethepowercordthatworksmost synergisticallywiththeL‐1500inyoursystem.
Weadvisethatyoukeeptheboxandotherpacking materialsthatyourL‐1500camein.Itwillbeusefulifyou sellyourL‐1500orintheunlikelyeventyouneedtoshipit forservice.
SAFETY
Disconnectthepowercordbypullingtheplug,not
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thecable.
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Keepthepowercordawayfromanyheatsource.
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Keeptheunitawayfromliquids–donotallowany liquidtoentertheinterioroftheunit.
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Whentheunitismovedfromacoldtoawarm environment,allowsufficienttimeforany condensationtoevaporatebeforepluggingtheunit intoanACconnection.
•
Donotattemptanyrepairs.
• Seethenoteson“Location,Location,Location”.
CLEANING 
A.
Useonlyasoft,lint‐freeclothdampenedslightlywith wateronly(NOcleaningfluids!)tocleanthefaceplate, meterglassandchassis.
B.
Youmayuseanygoodqualitycontactcleaner recommendedforsuchapplicationstocleanthecontacts fromtimetotimeasyoudeemappropriate.
INITIALSET‐UP  A. LOCATION,LOCATION,LOCATION 
Likeallaudioproductsusingtubes,theAllnicAudioL‐ 1500needstobeplacedonasolidstandinalocation thatprovidesforgoodaircirculationaroundthe preamplifier.
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DONOTcovertheventilationslotsinthetopof thechassis. DONOTplacetheunitoncarpetorfoam.
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DONOTsubjecttheunittoknocksandshocksas youmoveitaround.Thisadviceismeant particularlyforthosewhomaywanttoplacethe L‐1500onsomekindofafter‐marketisolation feetorsimilardevices.Droppingonesideofthe
 
Chassisandglass
Connectors
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L‐1500,orthewholeunit,isnotagoodthingto do.
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DONOTplacetheunitnearastronglightorheat source.
• DONOTplaceanythingheavyontheunit.
• DONOTallowrubberorvinylmaterialstoreston
theunit’schassisforlongperiodsoftime.This coulddiscolourthemetal.
DOplacetheunitonashelforstandthatisstable
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andnotsubjecttovibrationorsuddenshock. DOconsiderusingahighqualitypowercordand
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inter‐connects,bothinputsandoutputs.TheL‐ 1500isahighlysensitivepieceofelectronic equipmentdesignedforneutralityandwilloutput whatyouputintoit.
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DOtrytoplacetheL‐1500awayfrommajor sourcesofRFIandEMI;thoughwellshielded,theL‐ 1500willfunctionbestawayfromlargepower transformersandothersourcesofsuch interference.
B. POWERCONNECTION 
TheL‐1500usesastandardthreeprongmaleIEC connectionforACinput.Youneedtouseapowercordwith afemalethreeprongIECconnectoratoneend.
TotheleftoftheIECconnector(facingthebackoftheunit asinFigure1),thereisapoweron‐offswitch.Leavethis switchintheOFFposition–thatmeanstheswitchis pressed“down”atthebottom‐whileyoumakeallinitial connections.
TheL‐1500youhavepurchasedissetinternallyforAC 110/120volt–60HZoperation.Thereisnowaytochange thistoanotherACsettingwithoutreturnoftheunittothe factoryforre‐wiring,attheowner’scost,including transportbothdirections.
C. INPUTS 
Therearefive(5)inputs.Line1andLine2arebalanced connections(XLRtypeconnectors).Theremaining3line inputsareRCAtypesingle‐endedconnections.Noneofthe inputsisintendedespeciallyforconnectiontoany particulardevice.
NOPHONOSTAGE‐TheL‐1500isalinestage preamplifieranddoesNOThaveabuiltinphonopre‐ amplifiersection.Youwillneedaphonopre‐amplifierif youwanttouseaturntablewiththeL‐1500.Youcan connectyourphonopre‐amplifiertoanyofthefive inputs,providedyouhavetheappropriatetypesof connectionsoradaptors.
TheL‐1500hasbeendesignedandmanufacturedtowork mostsynergisticallywithAllnicAudiophono preamplifiers,pre‐preamplifiersandequalization products.
D. OUTPUTS 
TheL‐1500isequippedwiththreepairsofoutputs.Two (2)oftheoutputsrequirebalancedconnectors(XLR type);one(1)pairisunbalanced,usingRCAtype connectors.
Oneofthepairsofbalancedoutputsisa“RecordOut”.It isastraightpass‐through,isnotaffectedbytheL‐1500’s circuitry,andprovidesnogain.
Theothertwopairsofoutputsareintendedfor connectiontoapoweramplifier.OnthebackoftheL‐ 1500thereisaswitchtoselecteitherbalancedorsingle‐ endedRCAconnectiontoyouramplifier.Theoutput selectionswitchisjustbelowthePhaseswitch(seeFigure
1).Pleasesettheoutputselectionswitchtothetypeof outputconnectionyouareusing.Ifyousettheswitchto “balanced”andthenconnectyourcablestotheRCA connections,audiblehumwillbeintroduced.
Youmayuseboththebalancedandsingle‐endedRCA outputsatthesametime,forexample,ifyourunone pairtoyourstereoamplifierandtheothertoa(orapair of)poweredsubwoofer(s).Insuchacase,settheoutput selectionswitchtounbalanced(RCA).Thiswillavoidthe introductionofhum.
E. PHASESWITCH 
Abovetheoutputselectionswitch,thereisaphase switch.Thisswitchisa180degreephaseswitch;phaseis eithernormalorinvertedonehundredpercent, dependingontheswitchposition.Oninitialconnection, settheswitchtonormal.Dependingonthephaseyour
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sourcesoutputandtheirfacilitieswithregardtophase,you maywanttoswitchtoinvertedphasesometimes.Phase issuesgenerallywillresultinlackofbassand/orfocusof thestereoimage.
REMOTECONTROL
Theremotecontrolprovidestheabilitytoremotely: 
PowertheL‐1500onandoff(itisa“toggle”typeswitch) usingthebuttonlabeled“POWER”. Selectthelinesourceinputusingeitherthenumbered buttonsortheupanddownarrowbuttonsaboveand belowtheCHANNELlabel.
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INITIALPOWER‐ON
OnceyouhaveyourL‐1500inplace,allconnectionshave beenmadetoyoursourcesandyourstereoamplifieror mono‐blocksand/orsubwoofer(s),pressthepowerswitch ontherearpanelofthechassistothe“on”position–that meanstheswitchis“down”atthetop.
PLEASENOTE–CAUTION!
1) Youmayneedtodepressthepowerswitchonthe
Controlthevolumelevelusingtheup(louder)and down(quieter)arrowbuttonsaboveandbelowthe VOLUMElabel. MutethevolumeusingthebuttonlabeledMUTE, locatedbetweentheCHANNELandVOLUMEarrow buttons.DepressingthisMUTEbuttonwillrunthe volumecontroldowntozero.Toraisethevolume againaftermuting,presstheMUTEbuttontotake thevolumeleveltowhereitwaspriortomuting.
rearofthechassisseveraltimes(wait30seconds orsobetweeneachtry),fortheL‐1500topowerup internally(beforeyouturnontheunitfromthe frontpanelortheremotecontrol).Theboot systeminsidetheunitneedstorecognizethe remotecontrolandsynchronizewithit;thisiswhat accountsforthepossiblenecessityofseveraltries withtherearswitch.Whenthatoperationis successful,theeventsdescribedjustabovewill occur.Unsuccessfulboot‐upsmayresultinsomeof thefrontLED’sglowingfaintlyifthepowerswitch onthefrontpanelofthechassisisinthe“on” position,butthismaybeignored.
2) Besureyouhavemanuallyturnedthevolume controlonthefrontpaneltotheextreme counter‐clockwiseposition(minimumvolume).
OPERATION
WhentheAllnicL‐1500haspoweredupinternallyand youhaveeitherdepressedthefarlefthandbutton marked“power”onthefrontpanel,orpressedthe powerbuttonontheremotecontrol,thefollowingwill happenonthefrontpanel:
Thelightabovethe“power”buttonwillilluminate. Themeteronthefarlefthandofthefrontpanel,labeled “current”willilluminate.Anyofthefivenumberedline sourcelightsthataredepressedwillilluminate.After aboutforty(40)seconds,thelightabovethe “operate”/”mute”buttonwillilluminate.TheL‐1500has a“softstart”delayforthetubesinordertoextendtube life.
TheAllnicAudioL‐1500isnowreadyforoperation.At thispoint,youcanpoweronyourstereopoweramplifier ormono‐blocks.
Toavoidsurgestothespeakers,itisbesttochangefrom inputtoinputonlywiththe“operate”buttonsettomute (thelightabovethebuttonwillnotbeilluminatedwhen thebuttonisinthe“mute”position).
Fromthispointon,operationisstraight‐forward.All functionsarecontrolledfromthefrontpanelorthe remotecontrol.Ofcourse,BECAREFULaboutdifferences ingainbetweenyoursources.Generally,discplayersand tunerswillhavegreatergainthanphono‐stages.That meansthevolumesettingforlisteningtoyourturntable mightbetoohighforlisteningtoCD’s.
Whenyouarefinishedlistening,turnoffyourstereo poweramplifierormono‐blockamplifiers.Thenturnoff theL‐1500,usingtheremotecontrolordepressingthe powerswitchonthefrontpanel.Thepowerswitchon therearpanelshouldstayinthe“on”position–thiswill keepkeycircuitrywarm,andyourL‐1500willbereadyto playwhenthesoft‐startturnsontheL‐1500nexttime youwanttolisten.Turnoffyoursourceslast.
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THECURRENTMETER 
Thisilluminatedmeterindicatesthecurrentsupplytothe gaintubesintheL‐1500.Itisanindicatoroffailureor damagetothefunctionoftheunit.Theneedleshouldbe betweenthetwoparallellinesjustleftofcentreonthe meterface.AnyfailureofthetubesorcircuitsintheL‐1500 isindicatedbythemeterneedlemovingoutfrombetween thesetwoparallellines.Youneedtoswitchthemeterand checkbothchannelstoascertainwhathasoccurred(Use thetoggleswitchlocatedonthebottomofthechassis, behindthebottomleft‐handcorneroftheL‐1500front panel,toswitchthemeterbetweentherightandleft channels–toggletotheleftisleftchannelandvice‐versa).
Iftheneedlehasmovedtotheleftoftheparallellineson onechannelonly,itmeansthattheE810Ftubeforthat channelisfailing. Iftheneedlehasmovedtotheleftoftheparallellineson bothchannels,itmeansbothE810F’sarefailing. Iftheneedlemovestotherightoftheparallellines,it meansthatoneortheotherofthevoltageregulatortubes (7233or6485)isfailing.Inthiscase,theneedlewillalways betotherightoftheparallellinesonbothchannels.
Inthecaseofanyfailureindicatedbythemeter,please contactHammertoneAudioforassistance.
TUBES
TheL‐1500usesthefollowingtubes(seeFigure4): 
Two(2)xE810F One(1)x7233 One(1)x6485
Allconsequencesofchangingorattemptingtochange tubesarebornebytheuserunlessbyexpressagreement betweentheownerandHammertoneAudio.AllnicAudio andHammertoneAudioarenotliableinanyway whatsoeverforanyinjuryorlossincurredbytheuserorfor damagetotheL‐1500,anyofitsparts,ortubesor replacementtubesresultingfromtheuserchangingor attemptingtochangetubes.
SPECIFICATIONS
FORTHEALLNICAUDIOL‐1500LINESTAGEPRE‐ AMPLIFIER
Inputs:Linelevel×5pairs
(Balanced×2,Unbalanced×3)
Outputs:Balanced×1pair
Unbalanced×1pair
InputImpedance:Unbalance d10 kΩ
Balanced20kΩ
FrequencyRange:20Hz~20kHz(FLAT)
16Hz~75kHz(‐3dB)
VoltageGain:+20dB 
THD(1kHz):Output0.3V,0.06%
Output1.0V,0.15%
S/NRatio:90dB(CCIR,1kHz)  MaximumOutput:15VRMS(Non‐clipping)  OutputImpedance:150ΩConstant  PowerConsumption:30Wat110/120V/60Hz 
Tubes:E810F(orD3a)×2(gainstage,
leftandrightchannels–there arenoequivalentstothese tubes)
7233(noequivalent)×1
(VoltageRegulator)
6485(similarto6AH6,6AH6WA,
6AH6S,CV2521)×1(Voltage Regulator)
Fuse:AC3A,250V 
Dimensions:430mm(16.9291inches)(W)
300mm(11.811inches)(D) 120mm(4.72441inches)(H)
Weight:9kg(19.8lbs)unpacked.
Shippingweightinoriginal materialsis12.7kg.(28lbs)
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          WARRANTY
AllAllnicAudioamplifierproductsarewarrantedagainstmaterialsandmanufacturingdefects forparts,excludingtubes,andlabourfortwo(2)yearsfromdateofpurchase.Tubesare warrantedagainstmaterialsandmanufacturingdefectsforone(1)yearfromdateofpurchase. Thewarrantyistransferableforthebalanceoftheoriginalpurchaser’swarrantyperiod, provided,asstatedbelow,nounauthorizedrepairsormodificationshavebeenperformedon theproduct.Dateofpurchaseisthedateindicatedontheinvoicefortheproductissuedby HammertoneAudio.
Forthewarrantytobevalid,adefectiveproductmustbereturnedtoHammertoneAudiofor servicepriortoanyunauthorizedattempttorepair.AnyrepairworkonanAllnicAudioproduct notspecificallyauthorizedbyHammertoneAudiowillvoidthewarrantyontheproduct.
                     
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Figure1–L‐1500RearPanelView
Figure2–L‐1500RemoteControl
Figure3–L‐1500FrontPanelView
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 
Figure4–L‐1500InternalView
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