McIntosh C20 - User manual

TheC20istheonlyStereoControlConsolethathas
enoughflexibilitytocontrolallprogramsources.
TheC20istheonlyStereoPreampwithenoughrecord
compensationforthevaluableMonophonicaswellasthe
newStereorecords.
TheC20hasthemost completefacilitiesfortaperecord-
ing,playback,dubbingandmonitoring.
TheC20hasbyfarthesimplestyetcompletecontrolof
tonebalance.
TheC20isbyfartheeasiesttomountandstillgivepro-
fessionalappearance.
TrieC20isproducedfromthreeyearsofcarefulthorough
researchanddevelopment.
C20
The
TheGreatestFLEXIBILITY
TheFinestPERFORMANCE
TheHighestQUALITY
STEREOPREAMPLIFIER

LABORATORY,INC.
2CHAMBERSSTREET,BINGHAMTON.N.Y,
Phone-AreaCode607-723-5491
2O-HP30-761Printed In U.S.A. BE012003
InCanada:Manufacturedunderlicenseby:
McCurdyRadio Industries,Ltd., 22 Front Street West, Toronto, Canada
InputSelector:Selectsanyoneeightpro-
gramsourcesincludingTape,Tuner1 and
Tuner2,Auxiliary,Phono1 andPhono2,
TapeHead1 andTapeHead2.Eachphono
inputhastwoswitchpositions,onefor
stereotheotherparallesthestereocar-
trigeforMonophonicrecords.
ModeSelector:
Reverse: connects left channel to right
speaker, right channel to left speaker,
corrects for left-right reversal of program.
Stereo:(normalStereomodeselectorposi-
tion) left channel to left speaker, right
channeltorightspeaker.
Left: left channel toleft speaker no pro-
gramtorightspeaker.
Right:rightchanneltorightspeaker,no
programtoleftspeaker.
M Left: left channelonly to both speakers.
MRight:rightchannelonlytobothspeakers.
RecordCompensator:Separatebassand
treblecompensatorswitchesincluding
"RIAA,""LP,""Tape-Head,"flatposition
formicrophoneandotherpositionsfor
monophonicrecords.(Turning"TREBLE"
controlto"TAPE"givesflatresponse.
Turning"BASS"to"O"givesflatresponse.)
ToneControls:
Treble:boost13dbat20,000cyclesatten-
uate18dbat20,000cycles.
Bass:boost16dbat20cycles,attenuate.
20dbat20cycles.
BalanceControl:Tobalanceforunequalpro-
gramsource:Turningcontroltoleftre-
duces right channel toNo Output Turning
controltorightreducesleftchanneltoNo
Output.
Phase Control: Reverses phase inthe left
channeltocorrectforspeakerorprogram
phasing.
HFCutoffFilter:Threepositionsproviding
(1)nofilteractionfornormaluse,(2)9 KC
cutoff,and(3)6 KCcutofftosucpress
recordnoiseandhiss.
LoudnessControl:CompensatesfortheFlet-
cher-Munsonhearingcharacteristicsas
programloudnessisreduced.
RumbleFilter:Suppresslowfrequencydis-
turbencessuchasrumble.
Tape: Front panel jacks, push button switch
controlledtopermittheadditionofa port-
able tape recorderwithout disrupting the
equipmentpermanentlyinstalled.
Tape Monitor: Topermitinstantaneous mon-
itoring of tapebefore and alter recording.
LowFrequencyTrimControls:Ontheback
panel.Compensateforunequalresponse
atlowfrequenciesduetopositionofspeak-
ersordifferencesinspeakerefficiency.
Provides6 dbboostat50cyclesstarting
from500cyclesor8 dbcutat20cycles
startingfrom200cycles.
CONTROLS
MainOutput:2.5Vwithratedinput
2outputjacksinparallelforeach
channel
TapeOutput:0.25Vwithratedinput
1outputjackforeachchannel
Leftplusrightoutput:2.5voltsfromsource
impedanceof23.000ohms
VoltageAmplification:
LowlevelinputstoMainOutput:
1,000to1 (60db)at1000cycles
LowlevelinputstoTapeOutput:
100to1 (40db)at1000cycles
HighlevelinputstoMainOutput:
10to1 (20db)
HighlevelinputstoTapeOutput:
1to1 (0db)
TapeMonitorinputtoMainOutput:
10to1 (20db)
A.C.Aux.Outlets:1 unswitchedfortape
machineorturntable.coloredRed;4
switched,coloredBlack
PowerRequirements:117volts60cycles
A.C.35watts
MECHANICALSPECIFICATIONS
Size:155/8"wideby51/8"high.Overall
depthofchassisbehindfrontpanelis
1213/16".. The space required in front of
cabinetpanelforthethicknessofthe
panelandknobsis1¼".
Weight:Chassisonly18pounds.Inship-
pingcarton28½pounds.
ELECTRICALSPECIFICATIONS
FrequencyResponse:±0.5db20to20,000
cycles
Distortion:Lessthan0.2%atratedoutput,
20to20,000cycles
HumandNoise:Highlevelinputs:85db
belowratedoutput
Lowlevelinputs:lessthan2 microvoltset
inputterminals
InputSensitivityandInputImpedance:
Auxiliary;
0,25volts470.000ohms
Tape:
0.25volts470,000ohms
Tuner1:
0.25volts470,000ohms
Tuner2:
0,25volts470,000ohms
Phono1:
2to10millivolts47,000ohmsforlow
outputcartridge
10to70millivolts47,000ohmsforhi
outputcartridge
0.1volt220mmfinserieswith47,000
ohmsforXtalorCeramic
Phono2:
Sameasphono1
TapeHead1:
2to10millivolts47,000ohmsforlow
outputhead
TapeHead2;
Sameastapehead1
TapeCompare(Monitor):
0.25volts,115,000ohms