McIntosh MR-55 Bedienungsanleitung
INSTRUCTIONMANUAL
MclNTOSHMODELMR-55
AM-FMTUNER
(SerialNo.1KOOOandup)
MclNTOSHLABORATORY,INC.
2ChambersSt.Binghamton,N.Y.
U.S.A.
www.eskonline.nl
TheMclntoshMR-55isa superiorqualityAM-FMTunerfor,useinhomemusicsystemsandprofes-
sionalapplicationswheredistortionfreereceptionisneeded.Typicalprofessionalusesare"offtheair"re-
cording,broadcastmonitor,rebroadcasting,etc.
Athoroughperusalofthisinstructionmanualwill givegreaterenjoymentandbetterlistening.TheMR-55
isthefinesttuneravailableandcompletefamiliaritywithitsfunctionsandoperationwillresultintheout-
standingperformanceyouexpectfroma Mclntoshproduct.
SPECIFICATIONS:
AM
Sensitivity:
1.5microvolts
Selectivity:
NarrowPosition:4 K.C.Bandwidth,± 10K.C.from
centerdown53D.B.
MediumPosition:13K.C.Bandwidth,± 10K.C.from
centerdown20D.B.
BroadPosition:20K.C.Bandwidth
(MeasurementsincludeR.F.andLF.circuits.Charac-
teristicssubstantiallyunchangedoverentireR.F.tun-
ingrange.)
A.V.C.:
Exceptionallystrong;lessthan4 D.B.audiooutput
changewithinputchangesfrom10microvoltsto
100,000microvolts.
Distortion:
Lessthan1%at100%modulation
Hum:
50D.B.belowfullsignal
Bandwidth:
LF.at600K.C.—20K.C.;at1600K.C.—20K.C.
R.F.at600K.C.—21K.C.;at1600K.C.—23K.C.
AudioBandwidth:
BroadPosition± 3 D.B.—20to10K.C.
MediumPosition± 3 D.B.—20to6.5K.C.
NarrowPosition± 3 D.B.—20to2.0K.C.
SensitivitySelector:
ThreePositions
FrontEnd:
21K.C.Constantbandwidth,bandpassinput
WhistleFilter:
70D.B.rejection10K.C.
FM
Sensitivity:
3Microvoltsat100%modulation(±*75K.C.
Dev.)forlessthan3%totalnoiseanddistortion
(BasedonI.H.F.M.(proposed)standardsfor
measuringF.M.Tuners)
CaptureRatio:
1to0.8
I.F.Amplifiers:
Four
I.F.Bandwidth:
200K.C.;FlatonTop
I.F.Transformers:
Mechanicallycaptive
Limiters:
Two;zerotimeconstantgrated-beamfollowedby
a0.5microsecondpentodelimiter
LimiterandDetectorBandwidth:
2Megacycles
FrequencyResponse:
±3 D.B.;20-20,000cycles
Hum:
75D.B.belowfullsignal
A.F.C.:
Separatedetector;strong,distortionfree,com-
pletelyvariable
Drift:
±30K.C.withoutA.F.C.:negligiblewithA.F.C.
AntennaInputImpedance:
300ohmbalanced;72ohmunbalanced
Radiation:
SubstantiallybelowF.C.C.requirements
TUBE
V1—6BZ7F.M.R.F.Amplifier
V2—6BZ7F.M.ReactorandF.M.Os
V3—6AB4F.M.Mixer
V4—6BJ61stLF.Amplifier
V5—6AU62ndI.F.Amplifier
V6—6Bf63rdI.F.Amplifier
V8—6AU64thLF.Amplifier
V7—6AL5A.M.DetectorandA.V.C.Detector
V9—6AL5P.M.A.V.C.
V10—6BN61stLimiter
COMPLEMENT:
V11—6AU62ndLimiter
V12—6AL5F.M.Detector
V13—6BV8AFCDetector
V14—6BA6A.M.R.F.Amplifier
V15—6BE6A.M.Converter
V16—6AL5A.V.C.Clamper
V17—12AU7SquelchAmplifierandF.M.
Metering
V18—12AU7AudioAmplifierandCathode
Follower
SIZE:
4¾InchesHighx 14¾InchesWidex 12InchesDeep
WEIGHT:
TunerOnly:17Pounds,3 Ounces;InShippingCarton:28Pounds
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INSTALLATIONINSTRUCTIONSFORTHE
MclNTOSHMR-55AM-FMTUNER
TheMR-55maybemountedinitsowncabinetorshelfmountedina customcabinet.Thetunerhasbeen
designedtomountona shelfratherthanhangfromthecasttunerpanel.Rubbershockmountingfeethave
beenprovidedtooffertheoptimuminmechanicalisolationfromextraneousvibrations.
Enclosedintheinstructionmanualenvelopearetwocopiesofthe"TUNERPANELCUTOUTTEM-
PLATE"andtwocopiesofthe"SHELFMOUNTINGTEMPLATE"formountingtheMR-55.Preparethe
cabinetforthemountingoftheMR-55byfirstcuttingthewoodencabinetpaneltoreceivethecasttuner
panel.
1.Onthebackofthewoodencabinetpanelmakea verticalcenterlineontheexactcenterofthearea
inwhichthetunerwillmount.Extendthiscenterlinetotheshelf.
2.Foldthe"TUNERPANELCUTOUTTEMPLATE"onthe"FOLDLINE."The"FOLDLINE"is
thelineofthetopoftheshelfonwhichthetunerwillmount.
3.Placethe"TUNERPANELCUTOUTTEMPLATE"intheproperlocationontheinsideofthecabi-
netwiththefoldlineagainsttheshelf.Thetemplatecenterlineshouldmatchthecenterlinescribedon
thepanelinstep1.
4.Inthecenterofthe"CutoutArea"onthe"TunerCutoutTemplate"arctwoholesmarked"LOCA-
TIONHOLES."Carefullyandaccuratelydrillthesetwoholeswitha 5/32inchdrill.
5.Transferthe"TUNERPANELCUTOUTTEMPLATE"tothefrontofthewoodencabinetpanel.
Matchthe"LOCATIONHOLES"fortheproperpositioningofthetemplate.Proceedwithmarkingthelo-
cationofthesixholesandtheoutlineofthecutoutonthefrontofthewoodencabinetpanel.
IMPORTANT:DRILLTHEFOUR3/16INCHANDTHETWO5/32INCHHOLESBEFORE
CUTTINGOUTTHETUNERPANELHOLE.
Thecasttunerpanelhasa 1/4inchoverlaptocovertheedgesofthecutoutincabinetpanel.
Nextpreparetheshelfformountingthetuner.
1.Measurethethicknessofthewoodencabinetpanel.
2."FOLDLINES"havebeensuppliedonthe"SHELFCUTOUTTEMPLATE"forstandardpane!
thicknessuptooneinch.Foldoncorrectfoldlineforyourwoodenpanelthickness.
4.Placethefoldededgeofthetemplateagainstthebackofthefrontpanel.Thetemplatecenterline
mustmatchthecenterlineextendedtotheshelfinstep#1ofthefrontpanelcutoutinstructions.
5.Carefullymarkthelocationsofthefour1/4inchholesandthe8 by101/4inches,ventillationhole.
6.Drillandcutouttheshelf.
NextpreparetheMR-55formountinginthecabinetbyremovingthepressedwoodshippingpalletfrom
thebottomofthetuner.
Removetheknobsbygentlypullingthemtowardyou.Removethefeltwashers.
Thecasttunerpanelhasbeenattachedtothetunerbytwoanglebracketsthatareforshippingpur-
posesonly.Theseareremovedbyunscrewingthefourscrews(twooneachside)thatholdtheanglebrackets
tothetunerchassis.Afterremovingthesefourscrewsthetunerpanelcanbeslippedoffovertheknobshafts.
Afterremovingthetunerpanellayitfacedownona protectedsurfaceforthefollowingoperations.
Removethefour6/32screws(oneoneachcorner)thatholdthetwoshippingbracketstothetunerpanel
—3—
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REMOVE
4-6/32
SCREWS
TWOEACHSIDE"
REMOVE
4-6/32
SCREWS
"ONEEACHCORNER"
Inthepartsbagaresix6/32x 1 1/4inchesthreadedrods.Installtheseinthesixdrilledandtappedholes
inthebackofthetunerpanel.
—4—
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PUTIN
6-6/32
THREADED
RODS
Thetunerpanelisnowreadytoheattachedtothecabinet.Thesixthreadedrodsareinsertedthrough
thetwo5/32inchandthefour3/16inchholesinthecabinetpanel.Securethetunerpaneltothecabinet
panelbyinstallingontherodsthe6/32"KEP"nutssuppliedinthepartsbag.Bringthenutsuptightwitha
wrenchornutdriver.
Thetunercannowbeinstalledinthecabinet.Thetunerissecuredtothecabinetshelfbytheinsertion
ofthefour10/32x 3/4inchthumbscrewssuppliedinthe-partsbagthroughthe1/4inchholes,intheshelf.
IMPORTANT:MAKESURETHATTHEINNERCHASSISFLOATSONTHERUBBERSHOCK
MOUNTINGFEET,ANDDOESNOTCONTACTTHECABINETORTUNERPANEL.
Nextreplacethefeltwashersandknobs.
Adequateventilationisessentialtothestableoperationofanytuner.Donotputa solidbackonthe
cabinetbehindthetuner.Ifthetunerismountedverticallymakesuresufficientventilationissupplied.
InstallationintheL-55cabinetisdonebythesameprocedureasforinstallationina customcabinet.
Thecabinetsaresuppliedwiththecutoutsandholesallprepared.
CONNECTINGPROCEDURE
FMANTENNA:Inhighsignalstrengthareasa minimumantenna,suchasthefoldeddipolesupplied,is
allthatisneededforlocal reception.Somecareshouldbeusedinlocatingthefoldeddipoleina positionthat
isfreeaspossiblefromlocalnoisesourcesandshieldingsuchasmetalroofingandbuildingframework.The
dipoleshouldbemountedhorizontally,andat90°tothelineofsightpathtothetransmittingstations.
Infringeareasa goodantennaisrequired.A highlydirectionalbroadbandantennausedinconjunction
witha rotorwillresultinsuperiorperformanceinlowsignalstrengthareas.
—5—
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FM.
TO
300ohm
FM
ANT.
AsubstituteforthefoldeddipolecanbeanexistingVHFT.V.antenna.TheMR-55issuppliedwith
aninternalswitchingarrangementthateliminatestheneedfortwosetcouplers.TheVHFT.V.antenna
lead-inisconnectedtotheantennaterminalsmarked"FM.ANT'."Connecttheterminalsmarked"TOT.V.
SET"totheantennaterminalsontheT.V.receiverwith300ohmantennalead.WhentheMR-55selector
switchisincitherofthe"FM"positionstheantennaisdisconnectedautomaticallyfromtheT.V.receiver.
InanyotherpositionoftheselectorswitchtheantennaisconnectedtotheT.V.setanddisconnectedfrom
thetuner.
TO300ohmVHFTV.
ANT.
TO
T.V.
SET
—6—
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75OHMUNBALANCED
ANTENNAINPUT
75OHMANTENNA:TheMR-55hasprovisionfortheconnectionofa 75ohmunbalancedantenna.
The75ohmterminalscrewsarenexttothechassisonthebackofthebrownbakelitebaluncardlocated
approximately2 inchesbehindthetuningknobflywheel.Thecenterconductorofthe75ohmcoaxiallead
isattachedtothescrewterminallocated3/8inchabovethechassis.Theouterconductororgroundsideis
connectedtothescrewterminallocatedclosetothechassis.Solderlessspadelugsaresuppliedforyourcon-
venience.
—7—
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ANT.SWITCHIN
THISPOSITION.
10'LOOPANTENNA
A.M.ANTENNA:FacilitiesaresuppliedontheMR-55fortheuseofa lowimpedanceloopantennaor
ahighimpedancelongwireantenna.AMreceptionwillgenerallybeimprovedthroughtheuseofa properly
installedlongwireoutsideantenna.
Forlocationswhereanoutsideantennaisimpossibleorimpracticala 10footloopantennaissupplied.The
loopisattachedbetweentheterminalsmarked"HI"and"LO"onthe"AM.ANT"terminalstrip.The"AM.
ANT"terminatingswitch,locatedleftofcenternexttothephonoinputjackonthebackpanelofthetuner,
mustbeintheloopposition.
Orientationoftheloopiscritical.Itshouldbemountedinaslargea circleaspracticalinthevertical
plane.
—8—
OUTPUTS
PHONO
INPUT
AM
ANT
ANT
LOOP
MULTIPLEX
OUTPUT
www.eskonline.nl
AnoutsideAMantennaisa wireaslongaspractical,mountedashighaspossibleabovetheground,at
rightanglestopowerlines.TheleadinshouldbecarefullypositionedawayfromallA.C.lines,
The"ANTENNA"terminatingswitchmustbein"ANT"positionwhenusingoutsideorlongwire
antenna.
AgoodgroundcanbeofassistanceinAMreception.A goodgroundisdescribedasa 1/2inchrod6 to8
feetlongdrivenintotheearth.Thegroundwireisconnectedtotheterminalmarked"LO."
TOLONGWIREASHIGH
ABOVEGROUNDASPOSSIBLE
Ifthetunerisconnectedtoanoutsidegroundasdescribedabovedonotconnectanyoftheotherequip-
menttothesamegroundtopreventgroundloops.Groundloopscancauseanincreaseinhum.
Foranalternategroundforusewhenusinga longwireantennaconnecttheshortinglinkbetweentermi-
nalsmarked"LO"and"GND."
-9—
INSULATOR
ANTENNAWIRE
ANT.SWITCHIN
THISPOSITION
AM
TOGROUNDSUCHAS
8'RODINEARTH.
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TOLONGWIREANTENNA.
ANT.SWITCHIN
THISPOSITION.
OUTPUT:Twopinjacksaresuppliedonthebackpanelmarked"Output."Thesejacksareinparallel.
Theoutputisunbalancedlowimpedance.Interconnectbetweeneitherofthesejacksandthetunerinputof
yourpreamplifierbymeansofthe6 footshieldedcablesuppliedwithyourtuner.
PlugtheA.C.cablefromthetunerintooneoftheauxiliaryA.C.outletsonthebackofthepreampli-
fier.
—10—
LOOP
AM
ANT
ANT
PHONO
INPUT
OUTPUTS
MULTIPLEX
OUTPUT
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