JBL 6011 Manual

JBL
6011/6012
INSTALLATION
ANDSERVICE
MANUAL

OwnersInstructions ProductSpecifications
ArchitecturalSpecifications
Theamplifiershallbesinglechannelwithaninputgain
controlandanoutputlevelmeteronthefrontpanel.
Theamplifiershallaccommodateanunbalancedhigh
impedanceinput,ora balancedlowimpedanceinput
withanoptionalplug-inaccessorytransformer.
Theamplifiershallbecapableofdeliveringa min-
imumof100W,continuoussinewave,20Hz-20kHz,
intoa 4 O load. (6011: Theamplifiershallincorporate
anoutputtransformerallowingfullpoweroperation,
35Hz-20kHz,intoan8 Q,16Cl or70.7V lineaswell
asa directoutputterminalfora 4 O load.](6012:No
outputtransformerandonlya directoutputterminal
shallbeprovided,butitshallbepossibletoinstallan
outputtransformereasilyatanytime.}
Theamplifiershallhave< 0.2%THD,20Hz-20kHz,
@100W,directoutput. (6011: Theamplifiershallhave
<0.2%THD,35Hz-20kHz,@ 100W,transformer
output.}Frequencyresponseshallbe± 0.5dB,
20Hz-20kHz,@ 1 W.Powerbandwidthshallbe
10Hz-40kHz.
Constructionoftheamplifiershallbemodular.The
entireamplifiercircuit,exceptforthepowersupply
(6011: andoutputtransformer}shallbemountedon
asinglecircuitboardattachedtotheheatsink,which
assemblyshallberemovablefromtheunitwiththe
mainframestillmountedina rack.Cablesconnecting
thecircuitboardtothemainframeshallbeofa length
sufficienttoallowremovaloftheboardwithoutdis-
connectionandshalldisconnecteasilyattwoplugs.
TheamplifiershalloccupythreestandardEIArack
spacesandshalloperateon120/240VAC,50/60Hz.
LOCUT/OUT
SWITCH(S301)
TRANSFORMEROUTPUT
TERMINALSTRIP(TB302]
LINETERMINAL
STRIP(TB301]
OPTIONALMATCHING/BRIDGING
TRANSFORMERINPUTSOCKET(XK301]
Model 6012 6011
PowerOutput1
Direct 100W 100w
Transformer Optional 100w
PowerBandwidth
Direct-Full 20Hz-20kHz,± 0.5dB
-% 10Hz-40kHz,± 0.5dB
Transformer—Full 35Hz-20kHz,± 1 dB
THD2
Direct
Transformer <0.2%
IM3
Full, 10W,0.15W <0.2%
LoadImpedance
Direct 4a 4a
Transformer[taps] 8a
16a
50a
OutputRegulation
Direct
Transformer Betterthan15%
PowerGain 72dB
InputSensitivity
Unbalanced
(50kO) 0.55V
Balanced4
0.35V
Balanced6-6
0.09V
Signal-to-Noise
Ratio7 90dB
Low-CutFilter 6dB/octavebelow250Hz,switchable
PowerRequirements 120/240VAC,50/60Hz
PowerConsumption
Quiescent 35W
y3Power 160W
FullPower 270W
Fuse 3A,3AG(120V)1.5A,3 AB(240V)
MaximumAmbient
Temp. 60°C(140°F)
MountingEIASTD
Spaces 3
Dimensions
FrontPanel 483mmx 133mm(19x5%2in]
DepthofControls 19mm[%in]
DepthBehindPanel 325mm
(1225/32 in)
NetWeight 13.6kg(30lb) 18.5kg(41lb)
ShippingWeight 22kg(48lb) 24kg(53lb)
Accessories JBL5195
Matching/BridgingTransformer
JBL60-6012
OutputTransformerAssembly
NOTES: 1.Continuoussinewave.
2. Totalharmonicdistortionatratedoutput.
3.SMPTEstandard.
4. 600a or15kawith5195Matching/Bridging
Transformer.
5.600a,14dBstep-upconfiguration.
6.Requiresinternalmodification.
7.Requires20kHzequivalentbandwidthfilter.
FIGURE1
DIRECTOUTPUT
TERMINALSTRIP(TB303)
RCA-TYPE
INPUTS(J301)

Installation
The6011/6012 is suitableeither for rackmounting in
three EIA rackspaceswithoutadditionalbracing or
ventilation, orfor counter-topplacement. A full setof
mountinghardware is packedwitheachunit. All exter-
nalconnections and matching/bridgingtransformer
option are made onthe rearpanel,Figure 1.
OperatingTemperature
Because the 6011/6012 is cooled by convection,
adequateclearance onthetopofthe unitmust be
provided to allowheatdissipation. The minimum
recommendedclearancewhenstacking the unit is
one EIA standardpanelspace.
Athermalswitch in theseunitsprovidesthermal
protection by shuttingdown the amplifier ifthe internal
temperatureexceeds a safeoperatinglevel,Themax-
imumallowableambienttemperature forthe amplifier
is 60°C (140° F).
OperatingControls
Alloperatingswitches,meter and levelcontrol are
located on either the frontpanel orthe rearpanel,
Figure1.Control,meter and switchfunctions are given
inTable 1.
InputConnections
Inputconnections tothe amplifier maybe eitherdirect-
coupled or transformer-isolated atthe LINEterminal
strip, TB301, orthe RCA-typephonojacks,J301,
Figure1.Directcoupling is accomplished by con-
necting the centerconductor ofa shieldedcable to
LO andthe shieldlead to GND, orto eitherRCA-type
phonojack.Table 2 lists the terminals andtheRCA-
typephonojacks and applications ofthe LINEterminal
strip. For transformer-isolatedinput, a 5195 matching/
bridgingtransformer(Figure 2) must be pluggedinto
the9-pinreceptacle, XK301, Figure 1. The inputleads
areconnected to terminalsHI, LOandGNDofthe
LINEterminalstrip.
OutputConnections
Table 3 shows the outputconfigurationsavailable.
TABLE 1
Gain Controlsinput of amplifier.Control is wired
ahead ofthe activecircuitry andcanbe used as
aninput padto preventoverloading and clipping
of the non-invertingoperationalamplifierstage.
NOTE: When theJBL5195 matching/bridging
transformer is used, the gaincontrol is across
theoutput ofthe transformer and therefore can-
not be used to preventinputtransformersatur-
ation if excessinputlevelsoccur.
PowerSwitchAppliesprimarypower to amplifier.
MeterProvidesapproximation ofthe outputlevel,
with a + 3 indicatingthat the amplifier is deliver-
ing its ratedcontinuoussinewavepowerinto
4 a.
Lowcut/outOffers the user a responseroll-off of6 dBper
octavebelow 250Hz.
Terminals RCA-Type
PhonoJacks Function Application TerminatingResistor
Special Instructions
50 kO
GND DirectCoupled Forunbalancedhighimpedance
(50 kCl) sources
-none—
"A"or"B"
-none —
HI
LO
GND
Transformerisolated Balancedhighimpedance
(15 kO) source upto level of
+ 15dBm (with 5195 matching/
bridgingtransformer)
-none-
Balanced 600O source upto
level of+15dBm (with 5195
transformer)
620 O,y2W, connected
toterminals"HI"and "LO'
Balanced 600O sourcewith
up to level of4 dBm with
14 dB additionalgain.
— none-Internalmodification
requiringservice
technician.
Terminals
(TB301) Terminals (TB302) Impedance Direct
Out Transformer Out
Link
LO. Chassis GND 4 O (2.0 V)
Yes None
8 0,COM
80(28.28 V)
Yes "HI"to"XFMRPrimary"
16O, COM
16 0(40V)
Yes "Hl"to"XFMRPrimary"
70.7V, COM 50 O
Yes "HI"to"XFMRPrimary"
FIGURE 2
TABLE2/TABLE 3

ServiceandMaintenanceInstructions
Thefollowingproceduresaredesignedtoassistinthe
isolationofmalfunctions.Theoperationsdescribed
shouldbeundertakenonlyafteraninvestigationofall
externalconnectionsandadjustmentshasindicated,
beyondreasonabledoubt,thattheproblemisactually
withintheamplifier.
WARNING:Disconnecttheamplifierfromthepower
sourcebeforeperformingserviceoperationsor
replacingcomponents.
VoltageConversion
Eitheramplifiercanbeoperatedfromeithera 120V AC
or240V AC,50/60Hzsource.Thelinevoltageselector
terminalstrip, TB401, Figure3,changestheprimary
connectionsofthepowertransformer.Usethefollow-
ingproceduretochangethevoltagerange:
1. Removethe10screwswhichholdthetopcover
tothechassis.
2. Toconvertfrom120VACto240VAC,removethe
twoterminalstripjumpers,Figure4a.Installone
jumperonlyperFigure4b.
3.Changethelinecordand/orattachmentplugto
matchthesupplysourcereceptacle,orusea 120V
to240VACadapter(notprovided).Theadapter
aswellasthepowersupplycordand/orattachment
plugusedforthe240VACmodeintheU.S.,
CanadaandJapanshallbebothULListedand
CSACertifiedforusewithsaidpowersource
receptacleandwiredperTable4.Foruseinother
countries,adapter,linecordand/orattachment
plugselectionshallbebasedonlocalregulations
governing240VAC,50/60Hzsupplysources.
4. Changethelinefusefroma 3A,3AGtypetoa
1.5A,3AB.
WARNING
THISSECTIONOFTHEMANUAL
CONTAINSSERVICEINSTRUCTIONS
FORUSEBYQUALIFIEDSERVICE
PERSONNELONLY.
FIGURE4A
120VAC
FIGURE4B 240VAC
FIGURE3
TB401
TABLE4
LineCordConnections
TerminalStrip FuseHolder GroundLug
Country WireColorCode (TB401) (CenterTerminal) (Figure3)
U.S.,CanadaandJapan Black — Attached —
White Attached --
Green - - Attached
Europe Blue Attached —
Brown Attached
Green/Yellow -Attached
120 240 120
120 240 120

WARNING
THISSECTION OFTHE MANUAL
CONTAINSSERVICEINSTRUCTIONS
FOR USEBY QUALIFIEDSERVICE
PERSONNELONLY
Item JBLPart
No.
Qty. Description
1 52886 1 knob
2 55651 1 panel
3 55098 1 meter
4 51580 7 10-32Keps3
5 10997 10
4-40x% Phillips-headmachinescrew
6 54959 1 lamp
7 54969 1 knob
8 4 3
mm1
9 4 3
mm1
10 4 3
mm1
11 89508 1
2
12 89508 1 10-32Keps2
13 11908 1
No. 6 inter-toothwasher
14 54968 1 6-32
hex spacer
15 55523 1 switch
16 55901 1 poweramplifierboard
17 55153 4
6-32xY2 hex washerheadscrew
*NOTES: 1.NoJBL replacement forthe3 mmset.
2. Unit may haveeither a Keps nut, Keps nutand washer or Keps nut, splitwasher and flatwasher.
3.Keps nut locked to panelstudwithLoctite.

WARNING
THISSECTION OF THEMANUAL
CONTAINSSERVICEINSTRUCTIONS
FOR USEBY QUALIFIEDSERVICE
PERSONNELONLY.
InstrumentType RequiredCharacteristic RecommendedInstrument
TestOscillator FrequencyRange:
20 Hz-20 kHz
Distortion: <0.001%
Output:1 V RMS Min.
SoundTechnology
Model1700 A
DistortionAnalyzer Measurable
to 0.002% SoundTechnology
Model1700A
Multimeter Accuracy:0.1%reading
+1 digit
DCRange: ± 199.9 mVto± 1199 V
Resistance:±0.2% of reading + 1 digit
InputImpedance: 10MO
FlukeModel8000 A
OutputLoadResistors 100W,
4 O and 8 n non-inductivetype,1% DaleNH-100
ResistorDecade Box
1 Q-1 kOMin.
VariableAutotransformer Capable
of supplyingmin. of500W over a range of 90-136 V.
1. If autotransformerdoes not have anAC voltmeter to indicate
outputvoltage,monitor the outputwitheither a multimeter orAC
voltmeter.
2. If autotransformerdoes not have a wattmeter, a wattmeter
capable of indicating15 - 270 W will be required.
GenRadW5MT3W
RecommendedTestEquipment
Thefollowingtestprocedures are requiredafter anIC,
drivertransistor,biasnetworkdiode,thermistor, or
outputdevice is replaced:
BiasAdjustment
Verifythatthedistortion at20 kHz,100W, isthe same
as 20 kHz at 1 W andthatthestableidlepower is
30-35W. If not, the followingprocedure is required:
1. SubstituteresistorR37with a decade box.
2. Adjusttheamplifier for 1 W at20kHz.
3.Adjustthedecade for minimumdistortion and sub-
stitute R37 with the closest EIA standardresistor.
4. Verifydistortion at 100 W and1 W.
NOTE: Amplifiermust be warmbeforeperforming
distortionmeasurements or adjustments.
DCOffsetAdjustment
Connectthemultimeter to testpoint #2onthe circuit
board. With the meter setat thelowest DC voltage
range(mV),adjust theDC NULLcontrol,R10, fora
minimum DC voltage, 0 ± 25mV.
NOTE: Amplifiermust be warmbeforemaking
adjustments.
Installation of OptionalTransformer
[option on 6012}
Toinstall the optionaloutputtransformerFigure 5,
[ModelNo.60-6012):
1. Remove the heatsink/circuitboardassembly.
2. Place the optionaloutputtransformer inthe corner
ofthechassisandsecure itat thefourholes inthe
bottom of thechassiswith the hardwareprovided.
3.Attach the Molexconnectortothematingconnector
oftheamplifier.
4. Remove the coveroverthecutout forthe TRANS-
FORMEROUTPUTterminalstrip.Slip thenew
terminalstrip of theoutputtransformerthrough the
cutoutandorient itso thattheGRAYwire isthe
COM. Screw the terminalstrip in placewith the
screwsthatheld the cover.
NOTE: If theoutputtransformer istobe used,install
aLINKbetween LOandHIof theDIRECTOUTPUT
terminalstrip,Figure 1.
14 dBAdditionalGainConversion
14 dBof additionalinputsensitivity,using the optional
JBLModel5195matching/bridgingtransformer, can
beoffered tothe user by removing the REDwire con-
nected topin#8of the9-pinreceptacle, XK301, and
reconnecting ittopin#7.
20 kHz Equivalent
BandwidthFilter
INPUT
OUTPUT

Performanceplotofa typicalunit WARNING
THISSECTIONOFTHEMANUAL
CONTAINSSERVICEINSTRUCTIONS
FORUSEBYQUALIFIEDSERVICE
~PERSONNELONLY
NGTBS-
GraphsrecordedusingRadiometersBKF10REC61S2andSMU401
Frequencyresponseanddistortionmeasurementsmadeusinga
constantinputleveltotheamplifierundertest
NOTES
GtaphsrecoidedusingRadiometersBKF10REC61S2andSMU401
Frequencyresponseanddistortionmeasurementsmadeusinga
constantinputleveltotheamplifierundertest

JBL ProfessionalDivision
JamesB.LansingSound,Inc.,8500BalboaBoulevard,Northridge,California91329 U.S.A.
56404 PTM 6011/12 10/78PrintedinU.S.A.