GTE 2400 User manual

GTE AUDIO COMPONENTS
OPERATING INSTRUCTIONSFOR MODEL 2 4 00

INTRODUCTION
Youaretheownerofoneofthemostsophisticated
andversatileaudioinstrumentsonthemarket.To
obtainthefullsoundqualityfromyourstereoreceiver,
itmustbecombinedwithspeakersystemsandother
accessoriesofequallyhighstandards.YourGTE
dealerwillbehappytoadviseyouwhenselecting
accessories.
Beforeoperatingthisreceiver,carefullyreadthe
instructionscontainedinthisbooklet.Itis
recommendedthatthisbookletbekeptwiththe
receiverforfuturereference.
TABLE OFCONTENTSPage
Introduction
2
Features
TunerSection3
AmplifierSection3
MuteCircuit3
PhaseQ-4 3
ProtectiveCircuits3
Stereo System SetUp4
Speaker System Connection 4
Antenna Connections 5
Power Source 5
Component Connections 6
Front Panel8
Sound System Operation
Aux10
AMReception10
FMReception10
Phono10
Microphone10
TapePlay10
TapeRecording10
RecordingTape 1 ontoTape2 10
Specifications 11
Care of Cabinet 12
Consumer Relations 12
WARNING: TOAVOIDPOSSIBLEFIREORSHOCK HAZARD, NEVEREXPOSETHIS
UNITTORAINORMOISTURE.IFSUCHEXPOSUREOCCURS,REMOVETHEPLUG
FROMTHEELECTRICALOUTLETANDHAVETHEEXPOSEDUNITCHECKEDBYA
COMPETENTSERVICETECHNICIAN.
2

TUNERSECTION
•FMFrontEndusesa FETina groundedgate
configurationlorexcellentsensitivityandsuperb
overloadrejection
•PLLstereomultiplexcircuitryusinganintegrated
circuittorlowdistortionandhighstabilityproviding
excellentstereoseparationoverlongtermuse.
•IFamplifiersectionutilizesceramicfilterswhich
provideexcellentimageandalternatechannel
rejection.
•Centertuneandsignalstrengthmetersmake
possibleoutstandingtuningaccuracy.
AMPLIFIER SECTION
•Direct-coupledOCLcircuitryutilizinginput dif-
ferentialmatchedtransistorpairsthroughtothe
complimentaryoutputtransistorsBecausethe
OCLcircuitryhasnooutputcapacitor,thepower
bandwidthinthelowfrequenciesisextended
beyondaudibility,providingmaximumlowfre-
quencyperformanceandexcellentdampening
characteristicsThecomplimentaryPNP-NPN
outputstagesalsoreducessignificantlythehigher
orderharmonicdistortionproducts,resultingin
cleanhighfrequencyreproduction.
•TonecontrolsutilizeBaxandallfeedbackcutboost
circuitryforpreciseadjustmentofbassandtreble
frequencies
•Phonopre-ampdistortionandnoisearekepttoa
minimumbyusinglownoisehighgaindevicesina
2stageDarlingtonpre-ampdesign.
MUTECIRCUIT
Thisreceiverincorporatesa FETaudiomutecircuit
whichisactivatedbytheFunctionButtonsandwhen
thereceiveristurnedonandoff.Attenuationofthe
audiosignalpreventsannoyingclicksandpops.
PHASEQ-4STEREO
Nowyoucanexperiencetotaldimensionalsound
.. .soundfromeverycorneroftheroom.TheGTE
PhaseQ-4matrixsystem,withfourspeakersinthe
sameroom,givestheeffectoffour-channelsound.In
almostanylivelisteningsituation,youhearsounds
froma numberofdirections.Soundfromthefrontfor
example,isreflectedoffrearandsidewalls.GTE's
PhaseQ-4approximatesa livelisteningsituation,
givingyoua newdimensioninstereosound.This
remarkableeffectisachievedwiththespeakersinthe
positionsindicatedinthediagram.Noticetherear
speakersareclosertothelistenerthanthemain
speakers.Thisarrangementcompensatesfora
slightlyloweraudiolevelfromtherearspeakers.
NOTE: Thissystemisdesignedtooperatewithstereo
orfour-channelmatrixprogrammaterialonly.When
listeningtomonauralprogramming,thePQ-4
speakersshouldbeturnedOFF.
PROTECTIVECIRCUITS
Yourreceiverincorporatesfourprotectivesystemsto
guardagainstabnormaloperatingconditionsthat
couldcausedamagetothereceiverorspeakers.
* Electronic Current Limiting
Protectstheamplifierfromimproperlyconnected
speakers.Iftheoutputisshortedorexcessively
loaded, theamplifierwillautomaticallylimitthe
outputsignaltosafelevels.
• Thermal Switch
Willshutoffthepowersupplytotheamplifier
sectioniftheinternaltemperaturebecomes
excessive.Theunitwillautomaticallycomeback
onwhenithascooled
•AC Power Overload Protection
Thisprotectionisprovidedbya FUSEwhichwill
shutoffyourreceiverincaseofanACpower
overload
* Electronic Speaker Protection
Providesspeakerprotectionincaseofcomponent
failureinthepoweramplifier.Thiselectronic
circuitwilldetectanyabnormalDCvoltageatthe
speakerterminalsandwillautomaticallyshutdown
thepoweramplifiersection.Normalsignalpower
capabilityoftheamplifierisnotimpairedbythis
circuit.
Ifallspeakersautomaticallyshutoffwhilethedial
remainslighted,turnyoursetOFF.Waitfor1
minuteandthenturnthesetbackON.Ifthe
speakersoperatemomentarilyandagainauto-
maticallyshutoff,unplugthesetfromtheelectrical
outletandconsultyourGTEdealer.
3
FEATURES

STEREOSYSTEMSETUP
•Wheninstallingandduringtheoperationofthis
receiver,caremustbetakennottocloseoffthe
ventarealocatedonthetopofthereceiver.One
inchminimumclearanceisrecommendedforsafe
andreliableperformance.
•Placementofyourspeakersystemswillvarywith
roomsize,acoustics,andpersonalpreference.
Thefollowinginformationwillassistyouinthefinal
placementofyourspeakersystems.
Generally,thespeakersystemsshouldbeplaced
atapproximatelyearlevelheight,andspacedat
leastsixtoeightfeetapart.Asthedistance
betweenspeakersystemsincreases,thestereo
separationbecomesmorepronounced.
Whenwiderspacingisused,anglethespeaker
systemsslightlysothattheprincipallisteningarea
intheroomiscovered.
•Witha highpowerstereosystem,improper
placementoftheturntablecanresultinacoustic
feedback(arumblingorhowlingsound).Acoustic
feedbackiscausedbyvibrationsfromtheloud
speakersreachingtheturntableandbeingre-
amplified.
Placingtheturntableona sturdyshelforcabinet,
andnotonorclosetoa speakercabinetwillreduce
theoccurenceoffeedback.
SPEAKER SYSTEMCONNECTION
Threesetsofspeakerterminals(A,B & PQ-4)are
providedonthereceiverwhichallowthe
connectionofthreesetsofspeakers.Useno
smallerthan18gaugewiretoconnectspeakersto
outputterminals.Alwaysbesurepositiveand
negativeoutputsareconnectedtocorresponding
positiveandnegativeterminalsonthespeakers.
CAUTION: BECAREFULTHATTHEWIRESDO
NOT"SHORT"EACHOTHEROUTATTHE
SPEAKERTERMINALS.
HelpfulHint:Mostlampcordor"ZIP"cordhasa
moldedridgealongonesidetoidentifypolarity.
Seeillustrationbelow.
•Speakerswitchesareconvenientlylocatedonthe
frontofthereceiversothatyoucanchangefrom
onespeakersystemtoanotherwithoutdiscon-
nectingandre-connectingaccessoryspeakers.
•Youcanlistenprivatelytoyourfavoritestereo
musicbypluggingaccessoryheadphonesintothe
built-instereophonejack.
Forrear(PQ-4)speakerstooperate,SystemA
SpeakerswitchandPQ-4switch(locatedonthe
rearofthereceiver)mustbeintheONposition.
HelpfulHint:WhenusingthePhaseQ-4matrix
system, itisrecommendedthatfrontspeakersbe
connectedtoSPEAKERB terminalsandrear
speakerstoPQ-4terminals.Withspeakers
connectedinthismanner,youcanturnrear
speakersoffsimplybyswitchingSYSTEMA
SpeakerswitchOFF.
Whenremotespeakersareused,itisrecom-
mendedthatfrontspeakersbeconnectedto
SPEAKERA terminals,rearspeakerstoPQ-4
terminalsandremotespeakerstoSPEAKERB
terminals.Withspeakersconnectedinthis
manner,rearspeakerscanbeturnedoffbysliding
PQ-4switchOFF.
CAUTION: CONNECTONLYSPEAKERSWHICH
ARE RECOMMENDEDFORUSEWITH AMPLI-
FIERSRATEDAT55WATTSORHIGHER.USE
OFSPEAKERSRECOMMENDEDFOR AMPLI-
FIERSRATEDATLESSTHAN55WATTSMAY
RESULTINPERMANENTDAMAGETOTHE
SPEAKERS ANDTHERECEIVERIFPLAYEDAT
HIGH LEVELS.
4

AM ANTENNACONNECTION
•SlideferriterodAMantennaassembly(contained
inseparatebag)intoholderandplug-inconnector.
AnExternalLongLineAMAntennamaybe
attachedbyconnectinglead-inwirefromantenna
torightAMANTENNAterminalandconnecting
ground(left)terminaltoa goodearthground,such
asa waterpipe.
NOTE: TheAMferriterodmustremainattached
forproperoperation.
FMANTENNACONNECTIONS
•ConnectleadsfromtheFMdipoleantenna
(suppliedwithreceiver)tothe300OHMFM
ANTENNAterminals.
Toattacha 300OhmExternalFMAntenna,
connecttheleadsfromtheantennatothe300
OHMFMANTENNAterminals.
Ifa 75OhmExternalFMAntennaistobeused,
connectthecoaxialcabletothe75OHMFM
ANTENNAjack
NOTE: UseonlyoneFMantennaeither75ohm
or300ohmatanyonetime
POWERSOURCE
Afterconnectingallcomponentstothereceiver,plug
inAClinecordtoa 120Volt,60Hertz(cycle)
alternatingcurrect(AC)only.Neverconnectthe
receivertoanelectricaloutlethavinga different
frequencyorvoltage.Permanentdamagetoyour
systemmayresult.
Note: Ifyourreceiverwillnotoperateoritsuddenly
goesoff,checkfuse.Iffusehasburnedoutreplace
withfusehavingsameamperagerating.If
replacementfusealsoburnsout,consultyour
authorizedGTEdealer.
ANTENNA CONNECTIONS
FM
OUTDOOR
ANTENNA
5

COMPONENT
NOTE: Makeallantennaandcomponent
connectionsbeforeturningpowerON
PHONO JACKS
Thetwophonoinputsallowfortheuseoftwo
turntables.
•SelecteitherthePHONOONEorTWOjacksand
plugturntablecablesintotheappropriateleftand
rightjacks.ConnectgroundwireunderPHONO
GROUNDterminal( V ).
•PHONOONEinputimpedancemaybeselectedfor
47kohm aswellas100kohm.Checkcartridge
specificationsforimpedancevalue.
SlidePHONOONEswitchtoappropriateinput
impedance.PHONOTWOinputimpedanceis 47kohm
only.
AUX JACKS
Plugtheoutputofaccessoryequipmentintotheap-
propriateleftandrightjacks.Typicalaccessoriesare:
•8-track,cassette,orreeltoreeltapeplaydeck.
•Microphoneormusicalinstrumentwithpre-
amplifier.
TAPE JACKS
Thetwosetsoftapejacksallowfortheuseoftwo
tapedecks.
Record
•ConnecttherecordLINEINPUTjacksofthetape
decktotheTAPEONE(orTWO)RECORDjacks.
Play
•ConnecttheplaybackLINEOUTPUTjacksofthe
tapedecktotheTAPEONE(orTWO)PLAY.
PRE-AMP
Thepre-amplifiersignalsarerelayedfromthe
PRE-AMPjackstothe-AMPjacksbytheuseof
jumpers.Thesejumpersmaybereplacedwith
accessoryequipmentsuchas:
•EnvironmentalEqualizer— toshapefrequency
responsetosuitroomacoustics.
6

CONNECTIONS
•SlavePowerAmplifier— todrivemultiplespeaker
systems.
•CrossoverNetworkanda SlavePowerAmplifier—
toconvertreceivertobi-ampoperation.
CAUTION: REMOVINGJUMPERSWITHPOWER
ONMAYRESULTINPERMANENTDAMAGETO
SPEAKERS ANDRECEIVER.
Toconnectanenvironmentalequalizer:
•TurnpowerOFF.
•Removejumpers.
•PlugcablesfromPRE-AMPjackstoenvironmental
equalizerinputjacks.
•PlugcablesfromAMPjackstoenvironmental
equalizeroutputjacks.
•Checkchannelconnectionsforproperhook-up
beforeturningpowerON.
Toconnecta slavepoweramplifier:
•TurnpowerOFF.
•Removejumpers.
•Usinga commerciallyavailable"Y"connector,
connectleftchannel(L)PRE-AMPandAMPjacks
toleftchannel(L)slaveamplifierjack.
•Repeatabovesteptoconnectrightchannel.
•Checkchannelconnectionsforproperhook-up
beforeturningpowerON.
NOTE: Youwillbeabletocontroltheslaveamplifier
throughthereceiverVOLUME,BALANCEandTONE
controls.
Toconnecta crossovernetworkanda slavepower
amplifier:
•TurnpowerOFF.
•Removejumpers.
•Plugcablefromleft(L)PRE-AMPjacktoleft
crossovernetworkinputjack.
•Plugcablefromleftchannellow-frequencysection
ofcrossovernetworktoleftchanneljackof
amplifierhavinghigherpowerrating.
•Plugcablefromleftchannelhigh-frequency
sectionofcrossovernetworktoleftchanneljackof
amplifierhavinglowerpowerrating.
•Repeatabovestepstoconnectrightchannel.
•Checkchannelconnectionsforproperhook-up
beforeturningpowerON.
NOTE: Whenusinga crossovernetworkanda slave
poweramplifierforbi-ampoperation,youwillbeable
toutilizeboththereceiveramplifierandslave
amplifier;andbeabletocontrolboththroughthe
receiverVOLUME,BALANCEandTONEcontrols.
UNSWITCHEDACOUTLETS
Plugaccessorycomponentssuchasturntablesor
tapedecksintotheseoutlets.Theoutletsremainon
whenthereceiverpowerswitchisturnedoff.
SWITCHEDACOUTLET
Plugassociatedelectroniccomponentssuchasan
environmentalequalizerorslaveamplifierintothis
outlet.Thisoutletwillbeoffwhenthereceiverpower
isoff.
NOTE: Donotusethisoutletforturntables,tape
decksorothermotordrivenaccessories.
WARNING: TOAVOIDA POSSIBLESHOCK
HAZARD, DONOTCONNECTANYACCESSORY
WHICHDOESNOTHAVEA MANUFACTURER
SUPPLIEDAUDIOOUTPUT JACK.
7

FRONT
FM DIAL— INDICATESFMSTATIONFREQUENCIES
88TO108MHz
AM DIAL — INDICATESAMSTATION
FREQUENCIES520TO1630kHz.
FMMPXINDICATOR—LIGHTGLOWSWHENYOU
HAVETUNEDINA STEREOBROADCAST.
NOTE: INDICATORWILLNOTLIGHTWHENMONO
BUTTONISDEPRESSEDEVENIFTUNEDTO
STEREOBROADCAST
FMTUNINGMETER— INDICATESBESTFM
TUNINGWHENPOINTERISCENTERED.
SIGNAL-STRENGTHMETER— INDICATESBEST
AMANDFMRECEPTIONWHENPOINTERISASFAR
RIGHTASPOSSIBLE.ITISALSOUSEFULFOR
ORIENTINGANTENNAFOROPTIMUMSIGNAL
STRENGTHONFM.
MIC JACK — FORMICROPHONEORMUSICAL
INSTRUMENTINPUT.
POWER— TOTURNRECEIVERONANDOFF.
PHONES JACK — TOPLUGINSTEREOHEAD-
PHONES.
SYSTEMA SPEAKERSWITCH— TOSELECT
SYSTEMA ANDPO-4SPEAKERSYSTEMS
SYSTEMB SPEAKERSWITCH— TOSELECT
SYSTEMB SPEAKERSYSTEM.
TREBLE— TOCUTORBOOSTHIGHFREQUENCY
TONESSUCHASFLUTESORVIOLINS
BASS — TOCUTORBOOSTLOWFREQUENCY
TONES, SUCHASKETTLEDRUMSORORGAN
PEDALNOTES.
BALANCE —TOADJUSTFOREQUALLEVELFROM
LEFTANDRIGHTSPEAKERS,TURNKNOB
CLOCKWISETOREDUCELEVELINLEFTCHANNEL.
COUNTERCLOCKWISETOREDUCELEVELINRIGHT
CHANNEL.
8

PANEL
LOG SCALE—QUICKREFERENCETUNINGGUIDE
THATPROVIDESLOGSCALEREFERENCENUM-
BERSWHICHCANBEUSEDTORELOCATE
FAVORITESTATIONS.
TUNING—TOSELECTAM& FMSTATIONS.
MONO— ENGAGESSYSTEMFORMONAURAL
SOURCES.ITALSOSWITCHESFMTUNERTO
MONO; THISWILLREDUCETHENOISEONWEAK
FMSTEREOSTATIONS
LOUDNESS—TOINCREASEBASSFREQUENCIES
FORPROPERTONALBALANCEATLOWLISTENING
LEVELS.
FM— TOENGAGESYSTEMFORFMRECEPTION.
FMMUTE— ELIMINATESINTERSTATIONNOISE
ANDWEAKNOISYFMSTATIONS.PUSHTOMUTE.
SHOULDYOUWISHTOSEARCHFORORLISTEN
TOWEAKSIGNALSTATIONSRELEASEMUTE
BUTTON.
AM — TOENGAGESYSTEMFORAMRECEPTION.
AUX — TOENGAGESYSTEMFORAUXILIARY
COMPONENTS.
HIGHANDLOWFILTERS— HIGHFILTERRE-
DUCESHIGHFREQUENCYTAPEHISS,RECORD
SCRATCHNOISEANDCUTSOFFFREQUENCIES
ABOVE10kHz.LOWFILTERREDUCESTURNTABLE
RUMBLEANDACOUSTICALFEEDBACK.
PHONOONEORTWO— TOENGAGESYSTEM
FORPHONOGRAPHPLAY.
MIC— TOENGAGESYSTEMFORMICROPHONE
USE.
TAPE ONEANDTWO—TOENGAGESYSTEMFOR
ACCESSORYTAPEPLAYORTAPEMONITORING.
NOTE: TAPEBUTTONSMUSTBERELEASED
FORFM,AM,PHONO,MIC,ORAUX
FUNCTIONS.
VOLUME—TOADJUSTAUDIOLEVEL,TURNKNOB
CLOCKWISETOINCREASEVOLUME.
NOTE: ALWAYSSETVOLUMETOMIN"0"
POSITIONBEFORETURNINGONRE-
CEIVER.
9

SOUNDSYSTEMOPERATION
BeforeturningthepowerON,setcontrolsand
switchesasfollows:
•VOLUMEcontroltoMINposition.
•TREBLE,BASS,andBALANCEcontrolstocenter
(0) position.
•SwitchappropriatespeakersystemON.See
"SpeakerSystemConnection."
•TAPEONEandTWObuttonstoOFF(unpushed)
position.
AUX
•Connectaccessoryunittorearofreceiver.See
"ComponentConnections".
•DepressAUXbutton.
•AdjustTREBLE,BASSandVOLUMEcontrolsfor
preferredloudnessandtone.
AM RECEPTION
•DepressAMbutton.
•RotateTUNINGcontroltoselectdesiredstationas
indicatedonAM dial. Receptionisoptimumwhen
pointeronSIGNAL-STRENGTHMETERisasfarto
rightaspossible.
•AdjustTREBLE,BASSandVOLUMEcontrolsfor
preferredloudnessandtone.
FMRECEPTION
•DepressFMbutton.
•RotateTUNINGcontroltoselectdesiredstationas
indicatedonFM dial. Receptionisoptimumwhen
pointerofFMTUNINGMETERiscenteredand
SIGNAL-STRENGTHMETERisasfartotherightas
possible.
•AdjustTREBLE,BASSandVOLUMEcontrolsfor
preferredloudnessandtone.
PHONO
•Connectturntabletorearofreceiver.See
"ComponentConnections".
•DepressappropriatePHONObutton.
•Whenplayingmonauralrecords,depressMONO
button.
•AdjustTREBLE,BASSandVOLUMEcontrolsfor
preferredloudnessandtone.
•Foradditionalinformationrefertoinstructions
suppliedwithyourturntable.
MICROPHONE
•Connectthemicrophoneormusicalinstrumentto
MICjack.Useeithera monoorstereotypephone
plug(SeeNote).
•DepressMONOpushbuttonifmonotypephone
plugisused.
•DepressbothPHONOONEandTWObuttons.Both
buttonsmustbedepressedtoselectthe
microphoneinput.
NOTE: Themicrophonejackusedonthisreceiverisa
3circuittypesimilartoa stereoheadphone
jack.Touse(2)stereomicrophones,a
commerciallyavailable"Y"adaptershouldbe
used.
TAPE PLAY
•ConnecttapeequipmenttoTAPEPLAYjackson
rearofreceiver.See"ComponentConnections".
•DepressappropriateTAPEbutton.
•AdjustTREBLE,BASSandVOLUMEcontrolsfor
preferredloudnessandtone.
•Foradditionalinformationconsulttheinstructions
suppliedwithyourtapedeck.
TAPE RECORDING
•ConnecttapeequipmenttoTAPERECORDjacks
onrearofreceiver.See"Component Con-
nections".
•Selectprogramsourceasdescribedunder
sectionsAUX,AM,FM,PHONOorMICROPHONE.
Theprogramsourcesignalisalwayspresentatthe
TAPEONE(andTWO)RECORDjacksallowing
simultaneousrecordingofsignalsources.Signal
sourceisnotaffectedbythesettingsofthe
TREBLE,BASS,VOLUMEorBALANCEcontrols.
•Ifthetapedeckisa 3-headtupeequippedwitha
tapemonitorfunction,therecordingcanbe
monitoredbydepressingtheappropriateTAPE
button. BoththePLAYandRECORDjacksmustbe
connectedtothetapedeck.Seeillustrationon
page11.
•Foradditionalinformationconsulttheinstructions
suppliedwithyourtapedeck.
RECORDINGTAPE1 ONTOTAPE2
•Connecttapedeck1 toTAPEONEjacksand
connecttapedeck2 toTAPETWOjacks.
•DepressTAPEONEbutton.
•A tapeplayedontapedeck1 cannowberecorded
ontapedeck2.
•Iftapedeck2 isa 3-headtypeequippedwitha
monitorfunction,pushtheTAPETWObuttonto
monitortherecording.SeeIllustrationonpage11.
10