GTE SYLVANIA GTE 2600 User manual

GTE SYLVANIA
FACTORY PREPARED
TECHNICALSERVICEDATA
STEREO HI-FI
BULLETIN: R26-5
MODEL:GTE 2600
Index on Page 28
SERVICE PUBLICATIONSDEPARTMENT
Entertainment ProductsGroup
700 Ellicott Street - Batavia, N.Y.
ThisBulletinintroduces the R26-5 chassisand Model GTE 2600.
All amplifier andtuner information iscontained in thisBulletin.
L.H.ENDPANEL
10-40204-3
MODEL: GTE 2600
CHASSIS: R26-5
BEZEL
74-40222-1
CONTROL KNOB
74-40202-2
CABINET TOP
74-40173-2
COVER GLASS
74-40208-1
TUNINGKNOB
74-40519-1
PUSHBUTTON
74-40146-1
MODEL: GTE 2600
CHASSIS: R26-5
GTE 2600
CABINET REPLACEMENTPARTSLIST
DESCRIPTION PARTNO.
Antenna - FM
27-14926-2
Bezel - Cover Glass
74-40208-1
- External Dial Glass
86-40213-1
- Glass Mounting Spacer 86-40332-1
- Positioning Pin 70-40219-1
- Toggle Switch Cover
74-36233-2
- Tuner 74-40222-2
Cabinet - L.H.End Panel 10-40204-3
-Pi.H.End Panel
10-40204-4
DESCRIPTION PARTNO.
Cabinet - Plastic Foot
86-91119-6
-Top 74-40173-2
Knob - Control 74-40202 2
-Set Screw
70-36732-4
- Tuning 74-40519-1
Pushbutton
74-40146-1
Pushbutton Guide- 6 Button 74-40237-1
- Single Button 74-40237-2
BULLETIN:
R26-5
BULLETIN:
R26-5
IMPORTANTNOTICE
THISRECEIVEREMPLOYSMANYCIRCUITS,COMPONENTS, AND MECHANICALPARTSDESIGNED FOR
PROTECTION AGAINSTFIRE,SHOCK, ANDRF INTERFERENCE. FOR CONTINUEDSAFETY ANY SERVICING
SHOULD BE PERFORMED BY QUALIFIEDPERSONNEL AND EXACTSYLVANIAREPLACEMENTPARTSSHOULD
BE USED.UNDER NO CIRCUMSTANCESSHOULDTHEORIGINALDESIGN BE ALTERED.
IMPORTANT:Avoid mistakes, orderSylvaniaparts by part number.
Price $1.75

PRODUCT SAFETY GUIDELINES FOR ALL PRODUCTS
CAUTION: DoNOT modify any circuit Service work should be performed only after youare thoroughly familiar with allofthe
following safety checks. Risk of potential hazards and injury to1he user increases if safety checks arenot adhered to
SAFETY CHECKS
SUBJECT: Fire & Shock Hazard
1. Besurethatallcomponentsarepositionedinsucha wayto
avoidpossibilityofshortstoadjacentcomponents.Thisis
especiallyimportantonthosechassis which aretransported
toandfromtherepairshop.
2.Alwaysreplaceallprotectivedevicessuchasinsulatorsand
barriers afterworkingona set.
3.CheckfordamagedinsulationonwiresincludingtheAC
cord.
4.Checkacross-the-linecomponentsfordamageandreplaceif
necessary.
5. Afterre-assemblyoftheset,alwaysperformanACleakage
testontheexposedmetallic parts ofthecabinetsuchasthe
knobs, antennaterminals,etc.tobesurethesetissafeto
operate without dangerofelectricalshock.Donotusea
line isolationtransformerduringthistest.UseanAC
voltmeterhaving5000ohmsper volt ormoresensitivityin
the following manner:
Connecta 1500ohm10wattresistor,paralleledby
.15MFD ACtypecapacitor, between a known goodearth
ground (waterpipe,conduit,etc.)andtheexposedmetallic
parts, oneata time.MeasuretheACvoltageacrossthe
combination1500ohmresistorand.15MFDcapacitor.
Reverse theACplugonthesetandrepeatACvoltage
measurementsagainforeachexposedmetallic part Voltage
measured mustnotexceed.3volts R.M.S. Thiscorresponds
to0.2milliampAC.
Anyvalueexceedingthislimitconstitutesa potentialshock
hazard andmustbecorrectedimmediately.
AC VOLTMETER
goodearthground
suchasthewater
pipe, conduit,etc.
place thisprobe
oneachexposed
metallic part
CHASSIS IDENTIFICATION
CHASSIS IDENTIFICATION
Chassis Identificationconsistsoftwoblocksofnumbers.Inall
correspondencerelatingtoa specificmodel,bothblocksof
numbers plusthecabinetmodelnumbershouldbegiven.To
associate a chassis with itsproperschematic,refertothe
numberbreakdowndescribed below:
CHASSIS ACCESS
CHASSIS COVER (CABINET) REMOVAL:
1. Remove3 screwssecuringtopedgeof Jack Platetocabinet.
2.Remove2 screwsalong lower edgeofeachsideofcabinet
securingcabinettochassis.
3.Remove2 screwssecuringtopofcabinettofrontplate.
Lift coverstraightupfromchassis.
BOTTOM COVER:
The bottomchassispanissecuredtothechassisby14screws.
Tilt Jack PlateoutwardattopforaccesstoQ710,Q720,
Q722, Q810,Q820andQ822.
Amplifierpanels,mountedverticallyinfrontoftheheatsink,
maybetiltedforwardtomakethe foil sideofthepanelsmore
accessible.
Removetheupperscrewfromeachendofthepanelmounting
bracket. Then, loosen the lower screwateachend;liftand tilt
theentireassembly.Caution:failuretore-positionthis
assembly correctlymayresultinpoordialdrivebecausethe
idlertensionspringisanchoredtothisbracket.
DIAL LAMP REPLACEMENT:
1. Removechassiscover(cabinet).
2.Removebracketimmediatelyto rear ofdialpointer carriage
(1 screw,eachend).

CHASSIS ACCESS (CONT'D)
3.Tiltlightboxandlamppanelasm.awayfromdialasm.
Useno.259bulb,Sylvania part number30-26288-3for
replacement
NOTE: BesuretopassbracketUNDERdialcordanddial
pointerleads when replacingbracket
MPX. INDICATOR, CLIPPING INDICATOR L.E.D.
1. Removechassiscover(cabinet).
2. L.E.D. andsocketaremountedtothefrontpanelunderthe
lightbox.Removeentireassemblybygendypullingsocket
outofmountinghole.UseSylvania part number
30-40307-1forreplacement
DIAL POINTER L.E.D.
1. Removechassiscover(cabinet).
2. RemoveBalance, Bass, Mid-Range,Treble,Tuningand
Volumecontrolknobs(Allensetscrews).
3.Remove4 screwssecuringfrontplatetochassis(2attop
and 2 atbottomofplate).
4.Removepapercoverattopofdialpointer carriage.
UseSylvania part number30-40306-1forreplacement
DIAL STRINGING

PRELIMINARY ADJUSTMENTS
DC OFFSET
Nosignalinput,volumecontrolMINIMUM,andNOoutput
loads.
Adjust R706,R806for0V±20mVatpin0T- LeftandRight
poweramplifieroutputs.Thisoffsetvoltage will changeasthe
amplifierwarmsup,butinnocaseshouldexceed+50mVafter
initialadjustment
IDLE CURRENT
Nosignalinput,volumecontrolMINIMUM,andNOoutput
loads.
Adjust R742,R842for18-22mV between pinsElandE2on
eachamplifierpanel.Adjust while chassisiswarm.Idlecurrent
will drift with temperaturechange,andshouldnotbereset —
innocaseshouldtheidlecurrentexceed44mV.
AUDIO PERFORMANCE:
AC Power:120VAC,60Hz,maintainedat±1/2V.
SIGNAL SOURCE: 600ohm(MAX.impedance),.01%T.H.D.
MAX.
INPUT TERMINATIONS: AUX.- 4.7K
TAPE - 4.7K
PHONO- 330ohm
MIC. - Self-shorting
OUTPUT LOADS:8 ohm±1%,70Watt,Non-inductive.
CONTROL, SWITCH SETTINGS:
Balance Control- MechanicalCenter.
Bass Control- MechanicalCenter.
Mid- RangeControl- MechanicalCenter.
Treble Control- MechanicalCenter.
Loudness Control- FullCW(MAX.)unlessotherwisespecified.
ModeSwitches- Off(Outposition).
FunctionSwitch- AUX.unlessspecified.
HUMANDNOISE
1. Use40Hz,5 poleButterworth high passfilter.
2.Select line polarityforminimumhum.
3.Usegroundplateunderchassis.
4.Terminateallinputsandselectfunctionsasrequired.
INPUTFORRATEDOUTPUT
RATED
OUTPUT
MAG. MIC.
AUX.
TAPE
PWR.
PHONO IN IN IN AMP.
IN OUTPUT
±3dB ±3dB ±2dB ±2dB
±ldB TO LOAD
2.5mV 2.6mV 250mV 250mV 1.4V 23.67V
RMS
8OHM
LOAD
PHONOOVERLOAD
Injecta 1kHzsignalforanamplifieroutputofapproximately
1 Watt(2.83VRMS).
Maintain1 Wattoutput level with volumecontrol while
increasinginputsignaluntiloutput shows .1% THDdistortion.
MINIMUM inputshouldbe65mV.
TONE CONTROLRANGE
Adjust a 1kHzinputsignalforanoutput level of
approximately1 Watt with tonecontrolscentered.This will be
theOdBreference level.
CONTROL FRE-
CONTROL
OUTPUT
QUENCY SETTING (±3dB)
BASS
100Hz CW
+11dB
CCW -11dB
1kHz
REFERENCE LEVEL
MID-RANGE 1kHz CW
+6.5dB
CCW -6.5dB
TREBLE
10kHz CW
+lldB
CCW -13dB
VOLUME
SETTING
MAX. READINGACROSS8 OHMLOADS
VOLUME
SETTING PHONO
MIC.
AUX.
TAPE
MAXIMUM 21mV 21mV 1.2mV 1.2mV
MINIMUM
.9mV .9mV .9mV .9mV
LOUDNESS COMPENSATION
Set volumecontrolon50%tap.
Injecta 1kHzsignaltodrivetheamplifierforanapproximate
1 Watt(2.83VRMS)outputThisisthereference level.
Change generatorfrequencyto100Hz- makesurethatthe
100Hzinput level isexactlythesameasthe1kHzsignal level.
SENSITIVITY AT1kHz:
Selectfunctionasrequired;terminateunusedinputs.
TheR26-5chassisisdesignedforoperationona 120VAC,
60Hzpower line voltage.Itiscapableofanoutputof70
Watts-per-channel into an8 ohmnon-inductiveload.

PERFORMANCE ANALYSIS (CONT'D)
RESPONSE
CONTOUR
LOUDNESS
SWITCH
OUTPUT, ±2dB
RESPONSE
CONTOUR
LOUDNESS
SWITCH
100Hz1kHz
FLAT
OFF (OUT)
0dB
0dB (Ref.)
COMPENSATED
ON(IN)
+8dB 0dB
HI andLP FILTERS
Drivetheamplifierforanoutput level ofapproximately1
Wattat18Hz,20kHztoestablishreferencelevels.Activate
switchesas shown toevaluateperformance.
SWITCH
POSITIONS
LOW FILTER
CUT AT18Hz
HIGH FILTER
CUT AT20kHz
OFF (OUT) 0dB (Ref.) 0dB (Ref.)
ON(IN) -24dB, ±3dB -22dB, ±3dB
CHANNEL SEPARATION
Driveonechannelforapproximately1 Wattoutput
Terminate undrivenchannel with properimpedance.
FREQUENCY
MINIMUM SEPARATION
100Hz
40dB
1kHz 40dB
10kHz 40dB
TheBALANCECONTROL will attenuateeachchannela
minimumof40dBeachsideofcenterposition.
POWER OUTPUT,DISTORTION
Pre-conditionchassisbydrivingbothchannelsforonehourat
1/3ofratedpower(Approx.23W)
Balance channelsforequaloutputateachtestfrequency.
Measured distortionisforanyoutput level from1/4Wattto
rated output into 4 or8 ohmloads.
FREQ.
RANGE
OUTPUT/
CHANNEL
4OHMLOAD
OUTPUT/
CHANNEL
8OHMLOAD
T.H.D.
(MAX.)
18Hz-
20kHz 70W(16.73V,RMS) 70W(23.67V,
RMS)
.1%MAX.
SPEAKER PROTECTION
Apply+5Vor-5Vtothedifferentialamplifier(Q702,Q802
respectively)inputs.Eachtestvoltageshouldactivatethe
protectionrelay within 2 seconds.SwitchACpoweroffto
resetrelay.
LIMITER CIRCUIT
Drivepoweramplifiertoratedoutputat1kHz with 8 ohm
load. Reduceloadimpedanceto2 ohms.Theoutput
waveformshould shown markedclippingonbothpositiveand
negativesignalexcursions.
CLIPPING INDICATORSshouldactivate whenever output
clippingoccurs.
AUDIOMUTE
Themutecircuitshouldattenuatetheaudiofor5 to10
seconds when switchingthereceiveron. When switching
between functions,signal levels shouldbeattenuatedatleast
30dB fora minimumof1/2second. Fast signalattenuation
shouldalsobeobserved when switchingreceiveroff.

AMPLIFIERPANEL
*Q726, Q728 ON LEFT PANELONLY. 700 SERIESCOMPONENTS, LEFT CHANNEL. 800 SERIES
COMPONENTS,RIGHTCHANNEL.
BOTTOMFOIL

PARTS
IDENTIFICATION(CONT'D)
CAPACITORS

PARTS
IDENTIFICATION(CONT'D)
RESISTORS

PARTS
IDENTIFICATION(CONT'D)
MISCELLANEOUS

PARTS
IDENTIFICATION(CONT'D)
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