McIntosh MC-30 User manual

INSTRUCTIONMANUAL
McINTOSHMODELMC-30
30WATTPOWERAMPLIFIER
TypeA-116B
Serial#9E341andabove
038-243
MCINTOSHLABORATORY,INC

DESCRIPTION
TheMcIntoshModelMC-30isa 30watthighfidelitypoweramplifierdesignedforhomeen-
tertainmentsystemsandprofessionalapplications.TheModelMC-30issimilartotheearlier
McIntoshModelA-11630wattamplifiersandincludesalloftherigidelectricalspecifications
andfeaturesfoundintheseearlierunitsplus:lessthan1/3%harmonicdistortionatanypower
outputupto30wattsandatanyfrequencyintheaudiospectrum,20to20,000cps;lessthan
1/2%intermodulationdistortionifinstantaneouspeakpowerisbelow60wattsforanycombin-
ationoffrequencies20to20,000cps;andnoiseandhumlevel90dbormorebelowratedoutput.
ThefamousMcIntoshhighefficiencyoutputcircuitisusedtoobtainthehighstandardofper-
formancefoundinthisamplifier.
TheMC-30maybeoperatedfromanysignalsourcedelivering0.5 ormorevolts,ordirectly
froma McIntoshAudioCompensatororPre-Amplifier,suchastheModelsC-8,C-4,C-104,
orC-108.Outputimpedancesof4,8 and16ohmsareprovidedfordirectconnectiontoloud-
speakers.Additionaloutputsfor166ohms(70.7volts)and600ohmsareprovidedforusewith
multiplespeakersystems,lines,etc.
INSTALLATION
Location
TheMC-30shouldbelocatedina ventilatedarea.Iftheamplifierishousedina cabinetor
otherenclosure,holesshouldbeprovidedforaircirculation.
InputConnections
1.Whena McIntoshAudioCompensatororotherMcIntoshpre-amplifierisusedwiththe
MC-30,plugthepre-amplifier'soutput-powercordintothe"Pre-Ampinput"receptacleonthe
MC-30andturnthe"gain"controlfullycounterclockwise.Thisreceptaclesuppliesthere-
quiredplateandfilamentpowertothepre-amplifierequipmentaswellasprovidingtheneces-
saryaudioconnection.
Forpre-amplifierinstallationandoperationrefertothepre-amplifier'sinstructionmanual.
2,Whena signalsourceof0.5 voltsormoreisusedtodrivetheamplifier,suchasthe
outputfroma tuner,taperecorder,orpre-amplifier,plugthesourceintothe"0.5 voltinput"
pinjackreceptacleorconnecttothe"0.5volt"and"GND"screwterminals.Usethe"gain"
controltoobtainthedesiredoperatinglevel.

GUARANTEE
Weguaranteetheperformanceofthisequipmentandthemechanicalandelectricalworkman-
shiptobefreeofdefectsfora periodof90days.Thisguaranteedoesnotextendtocomponents
iamagedbyimproperusenordoesitextendtotransportationtoandfromthefactory.
SERVICEINFORMATION
AllMcIntoshequipmentisdesignedfarlongtroublefreeoperation.Allcomponentsareof
highestqualityandareconservativelyoperated.Iftroubledevelopstheamplifiermaybeser-
vicedbyyourfranchiseddealer,a competentserviceman,orreturnedtothefactory.Equip-
mentwillnotbeacceptedatthefactoryunlessfactoryreturnauthorizationisfirstreceived.
Thefollowingchartofoperatingvoltagesandresistancesisofferedasa guideforservicingthe
unit.Allvoltagesandresistencesaremeasuredtochassisexceptthosewithasterisk(*).
Thesearemeasuredtochassiswithpin#2ofthe5U4GBgrounded.Voltagesaremeasured
withhighimpedenceVTVM.NOTE--UNITMUSTBETURNEDOFFWHENMEASURINGRE-
SISTENCES.
VOLTAGEANDRESISTANCECHART
Tube
12AX7
(Input)
12AU7
12BH7
PinNo.
1
2
3
4&5
6,7,8
9
1
2
3&8
4&5
6
7
9
1
2
3&8
4&5
6
7
9
DCVolts
NoSignal
134
0
1.2
Fil
-
Fil
270
134
138
Fil
270
110
Fil
355
0
16
Fil
355
0
Fil
DCVolts
at30Wout
120
0
1.1
6.3 V.actoPin9
-
-
235
120
126
6.3 V.actoPin9
235
100
•
295
0
14
6.3 V.actoPin9
295
0
-
ACVolts
at30Wout
1.3
0.24
0.22
-
-
-
9
13
0.57
-
9
0
-
132
9
0.32
132
9
-
Resistance
Unitoff
330K*
1M
3.3K
0to70
-
0to70
40*
330K*
13K
0to70
43K*
26M*
0to70
12K*
220K
1.2K
0to70
12K*
220K
0to70

ELECTRICALANDMECHANICALSPECIFICATIONS
SpecificationsfortheMcIntoshModelMC-30AudioAmplifier
PowerSupply
PowerConsumption
PowerOutput
Inputlevel
FrequencyRange
HarmonicDistortion
IntermodulationDistortion
ImpulseDistortion
NoiseandHumLevel
DampingFactor
InputImpedance
OutputImpedance
PhaseShift
TubeComplement
AuxiliaryEquipment
connection("Pre-Amp
input"receptacle)
Size
Weight
Finish
117/125volta,50/60cycles
135wattsat30wattsoutput
105wattsatzerosignaloutput
30wattscontinuous
Input#1(pinjackandscrewterminalsandpin
5ofpre-ampsocket).5voltsto30volts,with
gaincontrolInput#2(pin2 ofpre-ampsocket)
2.5 volts,(ForusewithMcIntoshpre-ampli-
fierequipment)
20to30,000cycles± .1dbat30wattsoutput
15to50,000cycles± .5dbat30wattsoutput
10to100.000cycles± 1 dbat15wattsoutput
Lessthan1/3%at30wattsoutputorless,20
to20,000cycles
Lessthan1/2%ifinstantaneouspeakpower
isbelow60wattsforanycombinationoffre-
quencies20to20,000cycles
Negligible
90dbormorebelowratedoutput
12orbetterfor4,8 and16ohmoutput,16
for600ohms
0.5 megfor0.5 voltinputand0.13megfor
2.5 voltinput.20cyclesto40Kc
4,8,16.166(70.7 volts)and600ohms(600
ohmisbalancedtoground)
20cycles3°
20,000cycles9°
Pre-Amp:12AX7
PhaseInverter:12AU7
VoltageAmp:12BH7
Driver:12AX7
Output:2--6L6GC/1614
Rectifier:5U4-GA
DesignedtopowerC-8andotherMcIntosh
Pre-Amplifiers
13"x 8"x 8"high,chassistypeconstruction
30.5 pound,net
ChromeandBlack