McIntosh C28 Manuale utente

OWNER'SMANUAL

C28

SOLIDSTATE

STEREOPREAMPLIFIER

Price$1.25

MclntoshLaboratoryIncorporatedguaranteesthisinstrumenttobecapable

ofperformanceasadvertised.Wealsoguaranteethemechanicalandelec-

tricalworkmanshipandcomponentstobefreeofdefectsfora periodof90

daysfromdateofpurchase.Ifsuchdefectsoccur,MclntoshLaboratoryor

oneofitsauthorizedagencieswillrepairthedefectatnocosttothepur-

chaser.Thisguaranteedoesnotextendtocomponentsdamagedbyimproper

usenordoesitextendtotransportationtoandfromthefactoryorservice

agency.

THREEYEARFACTORYSERVICECONTRACT

Anapplicationfora FREETHREEYEARFACTORYSERVICECONTRACTis

includedwiththismanual.Thetermsofthecontractare:

ForThreeYearsfromdateofpurchase

1.Mclntoshwillprovideallparts,materialsandlaborneededtoreturn

themeasuredperformanceoftheinstrumenttotheoriginalfactory

specificationsfreeofanycharge.TheSERVICECONTRACTdoesnot

coveranyshippingcoststoandfromtheauthorizedserviceagency

orthefactory.

2.AnyMclntoshauthorizedserviceagencywillrepairallMclntoshInstru-

mentsatnormalservicerates.Toreceivethefreeserviceunderthe

termsoftheSERVICECONTRACT,theSERVICECONTRACTCER-

TIFICATEmustaccompanytheinstrumentwhentakentotheservice

agency.

3.Alwayshaveservicedonebya Mclntoshauthorizedserviceagency.

Iftheinstrumentismodifiedordamagedasa resultofunauthorized

repairtheSERVICECONTRACTwillbecancelled.

4.TheSERVICECONTRACTisissuedtoyouastheoriginalpurchaser.

Toprotectyoufrommisrepresentationthiscontractcannotbetrans-

ferredtoa secondowner.

5.TheSERVICECONTRACTisgiventothepurchaserswholiveinthe

50UnitedStatesorCanadaonly.

6.ForyourprotectionMclntoshselectsitsdealerscarefully-Therequire-

mentsareverystrict.Onlyonedealerinsevenapplicantsqualifiesfor

aMcIntoshfranchise.ToreceivetheSERVICECONTRACTyourpur-

chasemustbemadefroma Mclntoshfranchiseddealer.

7.Yourcompletelyfilledinapplicationfora SERVICECONTRACTmust

bepostmarkedwithin30daysofthedateofpurchaseoftheinstru-

ment.

8.ToreceivetheSERVICECONTRACTallinformationontheapplica-

tionmustbefilledin.TheSERVICECONTRACTwillbeissuedwhen

thecompletelyfilledinapplicationisreceivedatMclntoshLaboratory

IncorporatedinBinghamton,NewYork.Iftheapplicationisnotre-

ceivedatMclntoshLaboratory,onlytheserviceofferedunderthe90-

dayguaranteewillapply.

GUARANTEE

YourC 28stereopreamplifierwillgive

youmanyyearsofpleasantand

satisfactoryperformance.Ifyouhave

anyquestionsconcerningoperationor

maintenancepleasecontactthedealer

fromwhomyoupurchasedthis

instrumentor:—

CUSTOMERSERVICE

MclntoshLaboratoryInc.

2ChambersStreet

Binghamton,NewYork13903

Ourtelephonenumberis607-723-3512

CONTENTS

Guarantee

Installation2-3

IfYou'reInA Hurry4

HowToConnect5-8

AdjustingTheTopPanelControls...9

UsingTheFrontPanelControls10,11

UsingThePushbuttons12,13

Specifications14,15

PerformanceCharts16,17

TechnicalDescription18,19

BlockDiagram20

TAKEADVANTAGEOF3 YEARSOFFREEFACTORYSERVICE

FILLINTHEAPPLICATIONNOW!

C28

SOLIDSTATE

STEREOPREAMPLIFIER

Installation

Adequateventilationextendsthetrouble-freelifeofelectronic

instruments.Itisgenerallyfoundthateach10"centigrade(18°F)

riseintemperaturereducesthelifeofelectricalinsulationbyone

half.Adequateventilationisaninexpensiveandeffectivemeans

ofpreventinginsulationbreakdownduetounnecessarilyhighop-

eratingtemperature.Thedirectbenefitofadequateventilationis

longer,trouble-freelife.

ThesuggestedminimumspaceformountingtheC 28is15

inchesdeepx 17½widex 6 incheshigh.Itcanbemounted

eitherhorizontallyorvertically.

TopreparetheC 28forinstallationremovetheplasticpro-

tectivecovering.TurntheC 28upsidedownsothatitrestsonits

topontheshippingpallet.Removethefourplasticfeetfastened

tothebottomofthechassis.

Nextplacethemountingbrackets,thepartsbagandthemount-

ingtemplateforeasyaccessibility.

Theprofessionalmountingdesigneliminatestheneedforyou

toprovideanyshelforbrackettosupporttheC 28.Itiscompletely

supportedbyitsownmountingbrackets.

Positiontheplasticmountingtemplateovertheareaofthepanel

tobecutoutforinstallation.

Thedesignofthemountingtemplateallowsyoutopositionor

locatethecutoutfromthefrontorrearofthepaneltowhichthe

instrumentistobemounted.

Ifthecutoutistobelocatedfromtherearofthepanel,the

followingstepswillhelpyou:

Onthebackofthecabinetpanel,scribea verticalcenter-

linethroughtheexactcenteroftheareainwhichthecutout

istobemade.

Placethetemplateagainstthebackofthepanelandmatch

thetemplatecenterlinewiththecenterlineonthecabinetpanel.

Makesurethatthereisatleast¼ inchclearancebetweenthe

bottomofthedashedlineofthecutoutareaonthetemplate

andanyshelforbracebelowtheproposedcutout.

Markthetwolocatingholes("C"holesonthemountingtem-

plate).

Drillthetwolocatingholes.Becertainthedrillisperpendicular

tothepanel.

Nowpositionthetemplateonthefrontofthepanelbyalign-

ingthe"C"locatingholesonthetemplatewiththedrillholes.

Withthetemplateinplaceagainstthecabinetpanel,markthe

"A"and"B"drillholesandthefoursmallholesthatidentifythe

cornersofthecutout.Jointhecornermarkswitha pencil.The

edgeofthetemplatecanbeusedasa straightedge.

IMPORTANT:DRILLTHE6 HOLESBEFOREMAKINGTHECUT-

OUT.

Accuratelydrilleachofthethreeholesontheleftandthe

rightsideofthecutoutareawitha 3/16inchdrill.

WiththesawontheINSIDEOFTHEPENCILLINEScarefully

cutouttherectangularopening.

Securethemountingstripstotherearofthecabinetpanel

usingtwoscrewsfromthehardwarepackage.

Insertthescrewsinthecenterholesofthecabinetpanel

{"B"holesonthetemplate)andtighten.Thescrewheadshouldpull

intothewoodslightly.(Usetwo¾ inchlongscrewsforpanels

under½ inch,ortwoVAinchlongscrewsforpanels½ inchor

thicker.)

Attachthemountingbracketstothecabinetpanelusingfour

screws.

Placethetemplateoverthemountingscrews.Themounting

screwsshouldbecenteredinthe"A"and"B"holesonthetem-

plate.Thesidesofthemountingbracketsshouldmatchthevertical

dashlinesonthetemplate.Ifnecessary,loosenthescrewsand

pushthebracketsintoalignmentandretighten.

Insertthepowercordthroughtheopeningsotherailsonthe

bottomoftheequipmentslideinthetrackofthemounting

brackets.Continuetoslidetheinstrumentinuntilthefrontpanel

isagainstthecabinetpanel.

AtthebottomfrontcornersofthePANLOCinstrumentsare

thePANLOCbuttons.

DepressingthePANLOCbuttonswilllocktheinstrumentfirmly

intheinstallation.

DepressingthePANLOCbuttonsa secondtime(aswitha ball-

pointpen)willreleasetheinstrument.Youcanthenslidethein-

strumentforwardtotheinspection-adjustmentposition.

Depressingtheinspection-adjustmentpositionlatcheswillallow

theinstrumenttoslidecompletelyoutoftheinstallation.

VERTICALINSTALLATION

Inthehardwarepacketaretwohelicalsprings.Fastenthe

springstothesmallflangesattherearofthePANLOCbrackets.

Theflangehasa notchanda holetomountthespring.Thesprings

assistintheremovalofverticallymountedPANLOCequipment.

DONOTUSETHESPRINGSONHORIZONTALLYMOUNTED

EQUIPMENT.

IfYou'reInA Hurry

A-BALANCE(outerring)make

onespeakerlouderthantheother.Permits

theadjustmentforunequalsoundcaused

byroomacousticsorprogrammaterial.

B-COMPcenterknob). . threeposition

switch.FLATisthecenterposition.PRES

(theleftofcenterposition)increasesthe

mid-frequencies.LOUD(therightofcenter

position)adjustsfrequencyresponseas

volumeisreducedtocompensateforhear-

inglossesatlowvolumes.

C-INPUTSELECTOR

AUX...foranydeviceconnectedtothe

AUXinputsonback.

TUNER...forFMstereoorAM/FMtuner.

PHONO1 ...forrecordplayer.

PHONO2 ...forrecordplayer.

MIC...formicrophone.

TAPEHD...fortapedeckwithoutelec-

tronics.

D-MODESELECTOR

UsetheSTEREOorSTEREOREVERSE

positionsforallstereoprograms.Allother

positionsaredesignedtohandlemono-

phonicprograms.

E-VOLUMEON/OFF

TurnstheACtotheC 28on,adjustsloud-

nessofsoundtosuityourtaste.

F-BASS

Modifythelowfrequencyprogramma-

terialtosuityourtaste.Rightchannelis

therightknob,theleftchannelistheleft

knob.

G-TREBLE

Modifythehighfrequencyprogramma-

terialtosuityourtaste.Rightchannelis

therightknob,theleftchannelistheleft

knob.

H-PUSHBUTTONS

TAPE1;Pushin- Monitortherecorded

programonTAPErecorder1;Out-Hear

theprogrambeingrecordedonTAPEre-

corder

TAPE2:Pushin- Monitortherecorded

programonTAPErecorder2;Out-Hear

theprogrambeingrecordedonTAPEre-

corder2.

MUSTBEINOUTPOSITIONTOHEAR

ANYOTHERPROGRAMSOURCE.

I-1 2/21 ...copyfromTAPE1 toTAPE

2orfromTAPE2 toTAPE1,whentwo

taperecordersareused.

J-LF...FILTERin...reduceslowfrequency

noisesuchasturntablerumble,OUT- flat

response.

K-HF...FILTERin...reduceshighfre-

quencynoisesuchasrecordsurfacenoise,

OUT-flatresponse.

L-MAIN(mustbeusedwiththeaccessory

SCR).Turnsthemainloudspeakeronor

off.

M-REMOTE(mustbeusedwiththeacces-

sorySCR).Turnstheremoteloudspeaker

onoroff.

N-JACKS

TAPEINPUT

Foruseasanothertaperecorderinput.

Usesthefunctionsnormallyconnectedto

TAPE2.

O-TAPEOUTPUT

Foruseasanothertaperecorderoutput.

Usesthefunctionsnormallyconnectedto

TAPE2.

P-HEADPHONE...toconnecta setof

stereoheadphones.

HowToConnect

CONNECTINGA RECORDPLAYERTOPHONO1

Connectthecablefromthe"left"channeloftherecord

playerintothe"L"PHONO1 inputjack.

Connectthecablefromthe"right"channeloftherecord

playerintothe"R"PHONO1 jack.

PHONO2 isprovidedfortheuseofa secondrecordplayer.

Connectthecablefromthe"left"channeloftherecord

playerintothe"L"PHONO2 inputjack.

Connectthecablefromthe"right"channeloftherecord

playerintothe"R"PHONO2 inputjack.

CONNECTINGA MICROPHONE

Connectthecablefromthe"left"microphonetothe"L"MIC

inputjack.Connectthecablefromthe"right"microphone

tothe"R"MICinputjack.

CONNECTINGA TAPEDECKFORPLAYBACK

Connectthecablefromthe"left"taperecorderheadonthe

tapedeck(onewithoutitsownelectronics)tothe"L"TAPE

HEADinput.Connectthecablefromthe"right"taperecorder

headtothe"R"TAPEHEADinput.

CONNECTINGA STEREOTUNER

Connectthecablefromthe"left"channeltuneroutputto

the"L"tunerinputjack.

Connectthecablefromthe"right"channeltuneroutputto

the"R"TUNERjack.

AUX

Anyhighlevelprogramsourcesuchasanothertunerora TV

setcanbeconnectedtotheinputjacksmarked"AUX."

CONNECTINGA TAPERECORDER

ToRecord:

Connecta cablefromthe"L"TAPEOUTPUTjackmarkedTAPE1

tothe"left"highlevelinputofa taperecorder.

Connecta cablefromthe"R"TAPEOUTPUTjackmarkedTAPE1

tothe"right"highlevelinputofthetaperecorder.

Connecta secondtaperecorderinthesamefashiontothe

TAPE2 outputs.

ToPlayback/Monitor:

Connectthecablefromthe"left"channeloutputofa tape

recordertothehighlevelinputs. . . "L"TAPE1.

Connectthecablefromthe"right"channeloutputofa tape

recordertothehighlevelinput.."R"TAPE.

Connecta secondtaperecorderinthesamefashiontothe

TAPE2 inputjacks.5

HowToConnect

CONNECTINGTHEC 28TOPOWERAMPLIFIERS

ConnecttheMAINoutputjackstotheinputofa

stereopoweramplifier.The"L"jackisconnectedtothe"left"

amplifierinputjack.The"Ft"jackisconnectedtothe"right"

amplifierinputjack.

TheoutputimpedanceattheMAINoutputis100ohms.Longer

cablesthanaresuppliedcanbeconnectedbetween

theC 28andtheamplifiers.Thelengthofthecableis

limitedbythecapacityofthecable.Thetotalcapacity

mustnotexceed1000pF.Forinstance:cableswitha

capacityof25pFperfootmaybe40feetlong.13.5pFper

footcablemaybe75feetlong.Theinputimpedanceof

theamplifiersshouldbe47,000ohmsorgreater.

CTROutput:

UsetheCTRoutputtofeedleftplusrightsignaltoa separate

poweramplifierformonophonicbackgroundmusicorfor

acenterchannelspeaker.

SPEAKERCONTROLRELAY

Tocontrolmainandremoteloudspeakersfromthefrontpanel

oftheC 28anaccessoryMclntoshSCRcontrolisneeded.

PlugthecablefromtheSCRcontrolintotheSPEAKERCONTROL

RELAYreceptacle.Thespeakersarethenconnectedtothe

SCRcontrol.(SeeDiagramp.8)

ACOUTLETS

Thereare4 blackACoutlets,2 greenACoutlets,andone

redACoutlet.ThepowertotheblackACoutletsiscontrolled

bythefrontpanelswitch.Usetheseoutletsfora tuner,

taperecorder,etc.Thegreenoutletsarecontrolledbythetop

panelswitchmarked"PowerAmplifier."Theredreceptacle

isonatalltimes.Usetheredoutletfora turntableor

recordchanger.Theturntableisprotectedbythisarrangement.

Itisnecessarytoturnofftheturntableorrecordchanger

withitsownACswitch.

GROUNDCONNECTION

Asinglegroundpostisprovided.Groundsforturntables,

recordchangers,tapedecks, etc.shouldbeconnectedtothis

post.Theleftandrightprogramcablesandthegroundwire

fromthatsourceshouldbewoundortwistedtogether.Toavoid

hum,makesurethegroundwiredoesnotmakeanyconnections

totheshieldsoftheleftandrightprogramcablesbetween

theprogramsourceandtheC 28.7

HowToConnect

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