Marantz 2235B User manual

Modef
22358
Stereophonic
IIf.-lIOaIlf-.o Receiver
MARANTZCO..
INC.20525NORDHOFF
STREET,CHATSWORTH,CALIFORNIA
91311
A WHOLLY-OWNEDSUBSIDIARYOFSUPERSCOPEINC..CHATSWORTH.CALIFORNIA
91311

FOREWORD
To obtain
maximum
performance
andenjoyment
from the Model22358Stereo
Receiver,
please
studythese
instr'uctionscarefully.
Installingand
operating
the Model
22358is not complicated,
but the flexibility provided
by its numerous
operating
featuresmerits
yourbecoming
familiar
with its controlsand connections.Our recom-
mended
procedures
will assure
you of securing
the superb
performance
for which the Model
22358was
designed.
Forconvenience, thismanual
isdividedintothree
parts. The first part covers installation.The
second
part outlinesa simplified
operating
pro-
cedure
in a simple,nontechnical
manner.The
thirdpartprovides
amoredetaileddescription
oJ
the featuresof the Model22358.Detailedtech-
nicalspecificationsandfunctionalexplanations
are
includedinthis
part.
For quick identification
of the manycontrols,
connection
facilities,and adjustmentson the
Model22358StereoReceiver,
all referencesto
themin thismanualare
printed
in BoLDFACE
type.
AC Line
Operaticin
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1
AFTERUNPACKING
It is advisableto retain all originalpacking
materialto prevent damageshould
you wish
to
transportor shiptheModel22358
(refer
to page
19for repackingandshippinginstructions),
Be
carefulthatyou
donotinadvertentlythrowaway
orlose
the
partspacked
withtheunit.
Please
inspect
yourStereo
Receivercarefully
for
any signsof shippingdamage.Our very strict
quality
control
and
professionalpride
ensure
that
each Model 22358 left the factory in perJect
condition. lf the unit is damaged
or fails to
operate,immediatelynotify your dealer.
lf the
unit was shippedto you directly,notify the
transportationcompanywithoutdelay.only you,
theconsignee,may institutea claim
againstthe
carrierfor shippingdamage.Savethecartonand
all packing materialasevidenceof damage
for
their inspection.
Shouldassistance
be required,
the MarantzCompanywill cooperate
fully in
assisting
your
claim.
Pleasefill out andmailthe WarrantyRegistration
Card
within ten daysof purchase. Thecard
will
remainon file at the MarantzCompany
for the
durationof thewarranty
period.
Wealso
strongly
advisethat you retain your sales
receiptto
provideproof of purchase
in the eventthat
Warranty
service
issought,
GENERALDESCRIPTI(IN
The Marantz
Model
22358 is anall solid
state
receiverincorporatingthe innovativedesignand
unparalleledtechnologythathave made
Marantz
famous
intheaudiocomponentindustry.
TheModel2235BfeaturesasensitiveFM
tuner,
a
highly selectiveAM tuner, a low distortion
preamplifier
andtwodirect coupled
amplifierson
a singlechassis,
while retaininga flexibility
comparableto thatachieved usingseparatecom-
ponents,
The
FM
tuner
utilizesanFET
frontend,
ceramiclF filters, and a phase
locked loop
multiplexdecoder.The AM tuner features
an
advancedintegratedcircuitand
ceramiclF filters
for highsele9tivityandsensitivity.
Theamplifier
sections
permit
theconneclionoftwostereo
pairs
of loudspeakers,a turntableor recordchanger,
two tape recorders,stereo
headphones,and an
auxiliarv
sourcesuchasanadditional
tuneror a
TV soundsource.
The22358alsofeatures
front
panel
DUBBING
jacks.

TABTE
OFCONTENTS
Preparationfor Use
MechanicalInstallation
MarantzWalnutCabinet
Customlnstallation
ConnectingtheModel22358
RearPanel
Con
nections
Phono
Inputs
Tape
Jacks
AuxInputs
FM
Antenna
AMAntenna
FMOuadradial
OutputJack
Pre
OutandMainInJacks
SpeakerSystems
SpeakerPhasing
Connectionto ACOutlet
ConvenienceOutlets
SimplifiedOperating
Procedures
MainControlsandSwitches
Power
Switch
SelectorSwitch
VolumeControl
EalanceControl
Bass,MidandTreble
Controls
TuningMeters
Gyro-TouchTuningKnob
DolbyFMSwitch
MonoSwitch
FMMutingSwirchand
Muting
LevelControl
Tape1MonitorSwitch
LoudnessSwitch
HiFilter
Switch
Main-Spkr-Remote
Switches
PhonesJack
e
4
4
4
4
4
4
o
t)
7
8
8
8
I
8
I
8
I
o
I
I
o
I
9
10
10
ControlCircuits
Balance
Control
VolumeControl
ToneAmplifier
Output
StageandProtective
Circuits
Specifications
Maintenance
Cleaning
FuseReplacement
lnCaseof Difficulty
Repairs
Repacking
forShipment
tc
15
tc
IJ
15
16
18
18
18
18
18
19
UsingTape
RecorderswithYourModel22358
DubbingJacks
MakingTapeRecordingsandDubs
TapeMonitoring
MakingModifiedTapeRecordings
RecordingDolbyizedFMBroadcasts
TechnicalDescription
General
FMTunerSection
FrontEnd
lF Stages
StereoDemodulator
Muting
Circuit
AMTuner
Section
Preamplif
ierSection
Tape
Signals
Tape
Monitor
Switch
IIST
OF
ITTUSTRATI(INS
1. Rear
Panel
ConnectionFacilities
andAdjustments
2. AM/FMAntennaConnection
3. AM Ferrite-rod Antenna
4. SpeakerSystemConnections
5. Operation
of SpeakerTerminals
6. FrontPanel ControlsandJacks
7. ThreeConductor
PhonePlug
8. Taoe
Recorder
Connections
9. Arrangement
forMakingModified
12
12
12
14
14
14
14
14
14
1A
14
15
15 '10.
11.
TapeCopies
FunctionalBlockDiagram
Packing
Instruotions
4
5
5
o
8
10
11
12
IJ
'to

PREPARATIONF(lB
USE
MECHANICAL INSTALLATION
TheModel 22358StereoReceiver
canbeinstal-
led in two basicwavs: In a beautifulwalnut
veneercabinetfor placement
onatable
or shelf,
or mountedin your own cabinetrvor custom
installation.
MARANTZWALNUT
CABINET
An attractivewalnut veneercabinet,Model
WC-22U,may be obtainedfrom your Marantz
dealer.Thecase
provides
for proper ventilation,
andcanbe
placed
onfurniture,oronabookshelf.
Completeinstructions
for installation are
provid-
edwiththewc-22u.
CUSTOMINSTALLATION
When
planning
a custominstallation,
allowade-
quate
spacingbetweentheModel
22358,cabinet
surfaces,and other componentsfor adequate
ventilation.
To install the Model
22358StereoReceiver
in a
customcabinet,
cut an opening
16-718inches
wideby 5-118inches
high.Sincethefront panel
oJthe Model2235B
islarger
thanthecutout,it
will neatly
hidetheedges
ofthecut.Remove
the
plastic
feetfromthebottomoftheunitandslide
it throughtheopening.
To support
the
weight
of
the Model22358,adequate
bracingacrossthe
rearof the cabinet
mustbe locatedto provide
contactwiththe rear
oftheunit.

Figurel. BeatPanel
Connection
Facilities
andAdiustments
CONNECTING
THEMODET22358
REARPANELCONNECTIONS
Figure1 showsthe locationof inputandoutput
jacks on the rear panel.
These
.jacks
are for
"permanent"
connections.
Front
panel
jacks
and
theirusewill bediscussedlater,All connections
to therear
panel
shouldbemadewiththe
power
to the entire
systemturnedoff. The rear
panel
signalconnections
arearrangedinstereo
pairs.
All
signalconnectionsto theModel 22358,with the
exception
of the FM antennaandloudspeakers,
shouldbe madewith shieldedaudiocables.To
avoidconfusion.connectone cableat a time
betweenthe 22358 and
theothercomoonentsof
your system.
This is the safestway to avoid
cross-connectingchannels
or confusingsignal
sourceoutputs
with inputs.
PHONOINPUTS
The PHONO
jacks
are intended
for usewith
magnetic
phono cartridgesand have
a 47,OAO
ohm
inputimpedance.
lf ahumisheardwhen
playing
records,this
is
an
indicationthat the record
player
or itsconnec-
tionsareinadequately
grounded.
Connecta
sepa-
rateground
wire from the truntableor record
changer
frametotheCHASSISGROUNDbinding
posr
of theModel2235B.lf thisisineffective,try
reversing
the polarityof the turntable's
power
p
lug.
lf hum persists, consulttheinstructionbooklets
for
theturntable
and/or
phono
cartridge.
TAPEJACKS
The rearpanelof the 22358
twotaperecorders. can accommodate
ThetermslN andOUTreferto the input
and
output of the Model
22358.Therefore,
the lN
jacks
ontheModel22358
acceptsignalsfrom
the
line
outputs
of eachtaperecorder;
the
OUT
jacks
feedsignal
tothetaperecorders'
line
inputs.
AUX INPUTS
TheAUX input
jacks
are
formiscellaneous
high
levelsignalsources
such as additional
tuners
and/orreceivers,
tape
players,phonographs
that
provide
RIAA equalizedhigh level
output,TV
sound
outputs
andotherexternal
components.
FM ANTENNA
The bestFM reception
isobtained
with a Log-
Periodic
typeantennamounted
ona
good
quality
rotor system.
For fringeareas,Marantzrecom-
mends
a Log-Periodic
antennawith six or more
elementsdesigned
expresslyfor FMreception.
To
minimizelocalnoiseandmultipath
picked
upby
thelead-inwires,useabalanced
andshielded300
ohmcableor a
coaxial
75
ohmcablewitha
300
to 75ohmmatchingtransformer
at theantenna.
Unshielded
lead-inacts as an omnidirectional
antenna,andcancancelthe directional
benefits
of vour antenna.Low-loss
300 ohm shielded
cableconsistsof two innerconductors
plus
an
outershieldandinsulating
lacket.
Thistype
of
shieldedcableeffectively
prevents
the lead-in
f
romcontributingmultipathdistortion.

For ruralareas,it is recommended
that a local
dealer
be consulted
aboutantenna
installation
andlightning
arrestor
protection.
Masterantenna
systems
arenot recommended
for use with your
Model2235B;suchsystems
areusually
designed
expressly
for television
receptionand
frequently
suppressFMsignals
beforedistribution.
Inaddi-
tion, masterantennasystems
oftenseverely
re-
ducethe
quality
of the
FMsignal.When
outdoor
antennas
are
prohibited
or inconvenient,
place
the
antenna
invacantatticspace
or-useasimple300
ohmTV "rabbitear"antenna
or theribbon-type
foldeddipoleantenna
supplied
withthe Model
22358. Both are practical
and will give satis-
factoryresults
inprimary signalareas.
Your
Model2235B
Receiverwillaccepteither
a
75or 300ohmantenna
(see
diagram,
Figure2).
The300ohmantennacableshould
beconnected
to thetwoterminalsmarked
FMontheANTEN-
NAterminal.Whenusing75
ohm
coaxialantenna
cable,connect
itsshield to the G (G ROUND)
terminal,
and its inneror centerconductorto
eitheroftheFMterminals.
AM ANTENNA
Your Tuner
isequippedwith anAM ferrite-rod
antenna.BEFOREUSINGTHEMODEL22358,
SWING
THE ANTENNA
OUTAS SHOWN
IN
FIGURE3.
The
ferrite-rod
antenna
will giveyousatisfactory
resultsin primary signalareas.
However,an
outdoor
antennawill provide better
receptionin
weakersignalareas.Two single
wires
are
required
to makeanAM outdoorantenna.
First.
connect
Figure2. AM/FMAntennaConnection
one
end
of a single wireto theAMANTENNA
terminalonthe rear
panel,
andtheotherendto a
veryhighhorizontalantennawireof 25
to 75feet
in lengthsuspended
betweeninsulators
in an
outdoorlocation
(the higherthe better).
Next,
connect
the othersinglewire between
the "G"
terminalof your Model22358 andanauthenti-
catedearth
ground
(such
asa metalwater
pipe).
FM OUADRADIALOUTPUT JACK
In anticipationof futurefour channel
quadra-
phonic
broadcasting,
your
Model22358is
equip-
ped
with an FM oUADRADIALOUTPUT
jack.
The
signalavailableatthis
jack
istheunequalized,
bufferedoutDut of the FM discriminator.lts
level,frequency
responsecharacteristics,and
out-
put impedanceareidealto driveafour channel
adaptor.This.iack
can
alsobeusedasa simple
"whitenoise"
generator
forchecking the
response
characteristics
of loudspeakersor amplifiers.For
this
application,
place
theModel 22358
in FM
modewith themutingoff, andtunebetweenFM
stationsto receiveinterstationnoise.
PREOUT AND MAIN IN JACKS
ThePREOUTjacks deliver
the outputof the
Model22358 preamplifier circuits
to the rear
panel.
TheMAINlN
lacks
aretheinputterminals
of the poweramplifiersectionof the Model
22358.fhe PREOUT
and
MAIN lN jacks are
bridgedinternallyby special contactswithinthe
jack assembly.When you wish to use such
equipment
as a graphic equalizer,
compressor/
limiter, or expander,
you may connect
these
instruments
to your Model 22358withappropri-
ate lengthsof shieldedaudiocables. Whenthe
Figure
3. AMFerrite-rodAntenna

external
equipmentis
connected,the
insertion
of
its RCA
phonoplugs
in to the MAIN lN jacks
automaticallybreaks
the internal
connections
to
prevent
theexternal
equipmentfrom
being
bypas-
seo.
SPEAKERSYSTEMS
The
SPEAKERSYSTEMS
terminals
on the
rear
panel can accommodate
two stereo
pairs of
Ioudspeakers.
Connectthemain
pair
totheMAIN
terminals.The REMOTE
terminals
are for a
secondstereo
pair
of loudspeakers
(see
Figure4).
Selection
of loudspeaker
systemsis
madewiththe
MAIN-SPKR-REMOTEpushswitches
onthefronr
paner.
To connectthespeakers
to thelvlodel2235B,
use
ordinary
#18 gauge stranded
two-conductor
lamp
cord.lf thedesired
cordlengthfor
eitherchannel
exceeds
30feet,
use
# 16
gauge
wire
orheavier.
Stripabout1/2-inch
of insulationfrom
eitherend
of both loudspeakercords.
Twistthe strandsof
eachconductorto prevent fraying.
Examine
the
Figure
4, SpeakerSystemConnections
wiresfor polarity
markings
Oneof each
pair
will
probably
bemarkedin anyoneof severalways.
Checkfor a molded
ridgeon the insulation,
a
tracer
thread,orone
ormoretinned
strands.
To assurethebeststereo
separationandfrequen-
cy response,
the speakers
must be properly
phased.
Normally,
thepositive
terminaloneach
speakershouldbe
connectedto itsrespective
(+)
terminal
ontheModel22358,
andthenegative
or
"common" terminal
shouldbeconnectedto its
respective
{-) terminal.
Usethe
polarity
markings
on thewires
to aidin makingidentical
connec-
tionsto each
speaker.lf yourspeakersusescrew
terminals,it is advisable
to attach crimp-on
"spade
lug" terminalconnectors
to the wires
at
theendthatwill be
connectedto the
soeakers.At
theamplifier
end,connectthewires
asshownin
Figure5.
SPEAKER
PHASING
lf the loudspeaker
cords
havenopolaritv
mark-
ings,or if youareotherwise
doubtful
that
vour
speakers
arecorrectly
phased,perform
thefollow-
ingtest
after
you havecompletedyour installa-
tion
and
your
systemisoperating.
o@
-f
frIGhT RIGHT
MAIN
SPEAKER
SYSTTMS REM()TE
SPEAKER
SYSTEMS

1.Complete
the necessary
signalconnections
so
that program material
maybe
played
rhrough
thesDeakers,
2.Placethesoeakers
inthecenter
oftheroom.
3.Depress
the MONO pushswitch
and play a
record
(orradioortape)withstrong
bass
tones
at a low volumelevel,Genter
the BALANCE
control.
4,Positionthe speakers
aboutsix inchesapart,
face-to-tace,Listen,particularly
to the ap-
parent
loudness
ofthebasstones.
5.Next,turn
off all
power,
but
donotdisturb
the
VOLUMEor BALANCEsettings.
Reverse
the
connections
onthe
rightspeakeronly,
Turn
on
the power
andlisten
again.lf the basstones
nowseemlouder
thanin (3),
you
havecorrect-
ed the phasing
between
the speakers.
lf the
bass
notesnow sound
softer,turn off the
power
and
reconnectthespeakers
astheyhad
been
originally.
6, lf an additional
pair
of speakersisconnected,
andif theyare
intendedto beusedin
thesame
room as the main speaRer,
check phasing
betweenthe remotesoeakersand the main
speakers.
Usethe BALANCE
controlto play
only two speakersat once,and invertthe
wiring
ontheremotespeakers
asnecessary.
Do
not change
the connections
on the main
speaker
system.
7.Once
having
phased
allspeakers,
you neednot
repeatthis
procedure
inthefutureif you
now
markthe speaker
connectionsand/orcables.
Any methodof coding
issatisfactory,
provided
it enables
you,in the
future,to duplicate
your
now{orrect hookup between speakers
and
amolifier.
Usecautionwhenconnecting
yourModel22358
to a loudspeakerwith built-in
power
supplysuch
asan electrostaticloudspeaker.The "common"
connection
terminal
of sucha speakermay be
capacitively
coupled
to ground through
itsown
power
supply.
To protect theModel22358
from
distortion
and possible
overload,
makesure
the
Figure
5..0pelationofSpeaker
Terminals
(-) terminalsof theModel22358are
connected
to the
"common"
terminals
of such aloudsoeaker
system,
CAUTION:NEVER DIRECTLY CONNECT
THE LOUDSPEAKER TERMI-
NALS OF ONE CHANNEL IN
PARALLEL WITH THOSE OF
ANY OTHER. ANY RESULTING
DAMAGE IS NOT COVERED
UNDER
WARRANTY.
NOTE: Do not use4 ohm speakers if main
and remotespeakersareto beused
simultaneously,UseI or 16 ohm
speakersonly.
CONNECTIONTO AC OUTLET
Withthe front panel POWER
pushswitch
"out".
plug the line cord into an electrical
outlet
supplyingthe
proper
voltage.
CAUTION:Do not exceedthe maximum
total
power
ratingsof theACoutlets.
The
POWER
switch
andothercircuitry in
the 2235tJ may suffer damageif
forcedto conduct
excessivecurrent.
CONVENIENCEOUTLETS
One UNSWITCHEDand one SWITGHED
AC
OUTLETSare provided on the rear
panel
for
powering
associatedcomponentsof yout system
(tape
recorder,record
player,
etc.).

t
e
ir,9.-"
-I'
"g'
c
r
It:
Figure
6. FrontPanel ControlsandJacks
PROCEDURES
POWER
SWITCH
ThePOWERswitch,whendepressed,suppliesAC
power to the Model 22358 and to the
SWITCHEDoutletonitsrear
panel.
SELECTORSWITCH
The SELECTORswitch selectsthe program
source
for listeningorrecording.
VOLUMECONTROL
TheVOLUMEcontroladjuststhe levelof both
outputchannelssimultaneously
while
maintaining
stereobalance
at allnormalsettings.lt doesnot
effectthe
recordingoutputs.
BALANCECONTROL
This control alters
the levelof eitheroutput
channel
in situationswhere it is necessarvto
correct unbalanced
programs
sometimesen-
countered
in olderstereorecordingsor in stereo
broadcasts.As it is moved from its center
position,
it decreasesthe levelin one output
channel
whilemaintainingthelevelintheother
channel.
BASS,MID AND TREBLECONTROLS
Thesecontrolsare usedto adiustthe tonal
balanceof prograr.n materialto suit individual
listening
preferencel
SIMPTIFIEDOPERATING MAIN
CONTRIITS
AND
SWITCHES
Whenoperating
theModel22358
StereoReceiver
for thefirsttime,followthese
simpledirections.
Later,full advantage
canbetakenof irsversatility
withtheremaining
controlsand
pushswitches.
Step1. Connect the FM anrenna
to the appro-
priate
terminalsontherear
panel.
Step2. Connectthe speakers
to the MAIN
speakertermina
l.
Step
3. Placeall pushswitches
in the "out"
position.
Step4. Turnthe VOLUME
controlallthe
wav
to the left (cou
nterclockwise)
and set
the BALANCE
control in center
oosi-
tion.
Step5. Rotate
TREBLE,
MID andBASS
con-
trolsto the 12 o'clock
position(each
pair
ofpointers todot).
Step6. DepresstheMAIN
SPKR
pushswitch.
Step
7. PlugtheModel
22358into
anACwall
outlet.
Apply system
power
by depress-
ingthePOWER
switch.
Step
8. Selectthe desired
program
sourceby
settingthe SELECTORswitchto rhe
appropriate
position.
lf FM or AM is
selected,rotate the GYRO-TOUCH
TUNINGknob
untilthedesiredstation
is
tuned.
Step9. Adjust
the VOLUME
controlto acom-
fortable
listening
level.
Thefollowingsection
will explaintheremainder
of the front panel controls.The
controlswill be
discussed
in orderof usagewith the mostcom-
monlyusedcontrols
discussedfirst.

TUNING
METERS
TheModel
22358is
equippedwithtwo meters,
a
SIGNAL
STRENGTHmeter
andanFM
TUNING
meter.
1.
TheSIGNAL
STRENGTH
meterindicates
the
relative
signalstrength
of any AM or FM
broadcast.
2.The FM TUNING
meteroperates
onlywhen
FM is selectedand indicatescorrect
station
tuningwhen
centered.
GYRO-TOUCH
TUNING
KNOB
AM: Switch
the
SELECTOR
to AMand
tuneto
the desired
station.Then rotate the GYRO-
TOUCHTUNING
knob
slightlyback
andforth
until
the maximum
reading
isobtained
on the
SIGNALSTRENGTH
meter.
FM: SwitchtheSELECTOR
to FMand
tuneto
the desired
station.Then rotate the GYRO-
TOUCH
TUNING
knob
slightly'back
andfonh
untilthe maximum
reading
isobtained
on the
SIGNAL
STRENGTH
meterand
a center
scale
reading
isobtainedon
theFMTUNING
meter.
DOLBY
FM SWITCH
To listen
to aDolbyized
FMbroadcast,
connect
a
Dolby
noisereduction
adaptor
betweentheTAPE
1MONITOR
OUTandlN
jacks
ontherear
panel
of the Model
22358. Depress
the DOLBY FM
pushswitch,
anddepress
theTAPE
1 MONITOR
switch.
WiththeDOLBY
FM
switchin,the
audiooutput
signalsare preset
internally
to standardDolby
level,
andthe de-emphasis
time
constantapplied
to thesignals
isalso
switchedfrom
75
psec
to 25
psec
automatically.
MONO
SWITCH
When
amarginal
stereosignal
isreceived,
random
noise
and
phase
modulation
mavcause
thetuner's
multiplex
circuitryto trigger
the
STEREOmode
intermittently.In this case,it is sometimes
desirable
to cancelthemultiplex
operation
entire-
ly in favor of obtaining
a more
listenablesignal.
The MONOswitch
performs
this functionand
convertsall output signalsto the monophonic
mooe.
While
playing
a
singlechannel
sourcesuch
asTV
or AM,depress
theMONO
pushswitch
to hearthe
sourcethrough both speakers.
When
playing
a
I
monophonicphonograph
record,usethispush-
switch
to suppressrumble,recordsurfacenoise,
andoincheffectdistortion.
FM MUTING
SWITCHAND MUTINGLEVEL
CONTROL
In theabsenceof anFMcarrier,all FM receivers
produce
noise.
This noiseis apparentbetween
stationswhiletuning.
The FM MUTING
pushswitch
activatescircuitry
featured
in the Model
22358 whichmutesthe
audiooutputs
whentuned"off-station".
TheMUTINGLEVEL
controlontherear
panel
determines
the ,threshold
level
for the muting
circuitry.Maximum
mutingeffectisachievedby
setting
the FM MUTINGLEVELto MAX.
To
prevent
mutingveryweak
stationsalongwiththe
noise,
themutingfunctionmay
beturnedoff by
releasing
theFMMUTING
pushswitch.
TAPE
1 MONITOR
SWITCH
Whenthis
pushswitch
is
"out", the
program
being
recorded
andheardisdetermined
by thesetting
of the SELECTORswitch.With the TAPE 1
MONITOR
pushswitch
"in", theamplifierinput
connections
areswitchedto the outDutof the
taperecorder
without
affectingthe
signal
present-
ed
to thetaperecorder's
input,thusallowing
you
to listen
to thesignalbeingrecorded
beforeand
afterrecording.
This
switchisalsoknownasthe
TAPE-SOU
RCEswitch.
LOUDNESS
SWITCH
The LOUDNESSswitch
comoensates
for human
hearing
characteristics
by boosting the bassand
trebleresoonse
at lowvolume
levelsto achievea
more
pleasing
tonalbalance.
HI FILTER
SWITCH
Thisswitch
canbeusedto reducehighfrequency
noisesuch
asthatassociated
with theplaying
of
poorly recorded
tapesor worn discrecordings.
WhentheAM tunerisbeingused,this
switch
will
help suppress
considerablythe high pitched
"whistle"caused
by adjacentAM channelinter-
ference.
Thisfilter will also,alongwith high
frequency
noise,slightly
attenuatehigh
frequency
program
material,andshouldthereforebe used
jud
iciously.

Figure7.ThreeConductorPhone
Plug
MAIN-SPKR-REMOTE
SWITCHES
These
switches
selecttheloudspeaker
terminalsto
whichaudio
oower
isfed.Either
the
MAIN
orthe
REMOTEstereo
pair of loudspeakersmay be
operateindividually,or simultaneouslyif both
switches
are depressed,Whenthe two MAIN-
SPKR-REMOTEswitchesareinthenormal"out"
position,
all loudspeaker
terminals
areinternally
disconnectedfrom the power
amplifier
section.
The
signalat thePHONES
jack
isnot
affecred
by
theMAIN-SPKR-REMOTE
switches.
NOTE: Volume
level
shouldbereduced
to mini-
mumwhen
switchingspeakers.
PHONESJACK
This
jack
acceptsheadphones
utilizing
astandard
threeconductor
phone
plug(see
Figure
7).lt is
internally
connectedto the power
amplifier
sec-
tion throughisolation
resistors
to provide
ade.
quate
soundlevelwith popular
lowimpedance
headphones
as
wellaswithhighimpedance
units.
Two or more setsof headphones
may be used
with the aidof "Y" connectors.
However,
output
level will drop as addirional
headphones
are
added.Theheadphone
jack
output
is
not
affected
bvtheMAIN.SPKR-REMOTE
switches.
10

USING
TAPE
HECORDERS
WITHYtlURIUIIIBEt
22358
The Modef22358 hasthreesetsof inoutsand
outputsfor taperecorders:
TAPE1 MON
ITOR
fN andOUT,TAPE2lN andOUT,andDUB-
BINGlN and OUT.To simplifythis discussion,
the tape recorder
connected
to the TAPE 1
MONITOR jacks will be referredto as the
"lVlAlN"recorder;thetaperecorderconnectedto
TAPE
2 will be referredto asthe "SECOND-
ARY" recorder;the recorderconnectedto the
DUBBINGfacitities
on the front oanel
will be
referredtoasthe
"EXTERNAL"
recorder.
DUBBING
JACKS
TheDUBBING
jacks
are
provided
to connectan
externaltaperecorderto the front panel of the
Model
22358.
Typically,
the
DUBBING
lacks.are
usedwhenthe
taperecorderis
to bea
"temporary"
part
of your
system.For example,
a friend
may bring
his
cassetterecorder
to vour hometo recordsome
tapesusing
your
Marantz
console.
Figure
8.Tape
Recorder
Connections
For
thisapplication,the
frontpanel location
of
the DUBBlNG.jacksisadvantageous.
Thetape
recorder
can be simply "patchedin" to your
systemwithout havingto remove
your Model
22358fromitsinstallation
orto disconneit
vour
owntape
deckfromtherear
panel.
For moreinformationon the DUBBING
jacks,
referto the followingsectionontape
recorders.
MAKINGTAPERECORDINGSAND DUBS
The SELECTORswitch determinesthe source
inputfor taperecording.Wherithe SELECTOR
switchis in AM, FM, PHONO,or AUX, the
sourceinputcanberecordedontothe
"MAlN"
"SECONDARY",
and "EXTERNAL" tape
re-
cordersindividuallyorsimultaneously.
To makea dub from the "SECONDARY" or
"EXTERNAL"
recorderon to the"MAlN" re-
corder,
place
the
SELECTORswitch
inTAPE2.
The
"SECONDARY"
recorderthenbecomesthe
sourceinput.
lf the "EXTERNAL"recorderis
plugged
into the DUBBINGlN iack, then it
pre-empts
the"SECONDARY"recorderandbe-
comesthe source input instead.
Therefore,
dubs
to the"lvlAlN" recordercanonlvbemade from
oneof thesetwo recordersat atime.TheTAPE
MAINNTCORDER
SECONOARY
RECOROER
EXTERNAL
RECOROER
REARPANEI
11

2 OUT jacks are muted to prevent
feedback
oscillations
intheeventthatthe
"SECONDARY"
recorderwere
inadvertently
placed
in the record
mode.
TAPEMONITORING
Noticethatthe
TAPE1 MONITOR
switchooer-
atesindependently
of the SELECTOR
switch.
Thus,the "MAIN" taperecordercanbemoni-
tored regardlessof the position of the SELEC-
TOR switch.This allows
you to comparethe
outputof the taperecorderto the inputsource.
To listento tape l, depresstheTAPE1 MONI-
TOR switch. To listento the source,as deter-
minedby the SELECTOR
switch,releasethe
TAPE
MONITOR1
switch.
MAKING
MODIFIEDTAPERECORDINGS
ThePRE OUTjacks on the rear
panel
of the
22358.maybeusedto feedinput signalsto atape
recordersothat
filters,
balance,andtonecontrols
can be used to modify the signal
prior to
recording.lVlodified
tapecopiescan
likewise
be
made.
First,selectthesourceontheSELECTOR
switch. Next, connect
the input of the tape
recorderto the PREOUTjacks by the method
illustratedin Figure9. Byconnectingtheoutput
of the tape recorderdirectlyto the MAIN lN
jacks,
the newly
recorded
tapecanbemonitored.
However,
please
notethat when
this methodis
employed,the volumelevelof the speakersis
determined
only by theoutputlevelof thetape
recorder.
Adjustment
of volumeis
possible
onlyif
therecorderhasoutputlevelcontrols.
RECORDING
DOLBYIZED
FM BROADCASTS
Dolbyized FM broadcastscontain Dolbyized
audioinformation
to which aspecial
pre-emphasis
isapplied
for thepurpose of improvingthenoise
reduction
process.
To makea Dolbyizedtape
recording
of such a broadcast,depressthe
DOLBY
FMswitch
to properly
de-emphasizethe
signal,but bypassthe noisereductionadaptorto
record
the Dolbyizedaudio directlyonto the
tape.
Theinputs
to thetaperecorderinthisapplication
mustbe
properly
calibrated
beforehandaccording
to the procedure
detailedin the Dolby unit's
instructionbooklet.To achieve
proper
calibra-
tion, it is necessarythattherecordlevelcontrol
on the Dolby unit be adjusted
to the proper
Dolby level
by use
of the referencetonetrans-
mittedbythe
FM
station.
Formonitoring
purposes,
connecttheDolbyunit
betweenthelineoutputsofthe
taperecorderand
the
TAPE1 MONITORlN jacks
on
the22358.
Whenusinga taperecordercontaininga built-in
FM Dolbyde-emphasiscircuit,abetter
signal-to-
noiseratio can be achieved by using only the
DOLBY
FM circuit in the Model22358instead
of the facilities in thetape
recorder.Do not use
bothde-emphasiscircuitssimultaneously.
FigureL ArrangementforMakingModified
TapeC0pies
C(]NNECTIONSF()RMONITORING
Mt)DIFIED
TAPECOPIES
TROM
R'CORDER
tEfTCHAI'llitL
()UTPUT
FROMRTCt}ROIB
RIGHTCllAl'lNtt
OUTPUT
TORECOROEi
IEFT
CHANNTI,
INPUl
TORMONDTR
nt8Hr
cHAriN:t"
IiIPUT
12

ANTENNA RF.STAGE MIXER
'il,9P*lEi
G 'i!|E}
{M IEI ]FSTAGE L MITER DETECTOfi
IIL
FRONT.ENO
T
---------
]OLBYFM
-----t.
i----l
OSC
LLATOR
MU]
LEV
c0l
.J I
I
I
I
NOISE
DC ING
iL
TROL
FM
QUAORADIAL
OUTPUTJAC(
----r---
I
I Prt-
I MUlTPLEX
I STEREO
I DECoDER
AMTLJNER
c
L---------
ROOANTENNA
IER
EQUALZATION *l LO\
AU( IEMIITER
FOLLOWEF
SELECIOR
L]ETTING
MONITOR\\r'
IN
JACI{
rN
jlcr( \Z
morrton (d
OUTIACK \gZ
-L TUNING
N FILTER
LDOLBY
FM I
SWTCH t
SIGNAL
STNENGTH
METER
I
FFEQUENCY
COMPENSATION I] FLTER
TAPE
1
MONITOR TONEAMPLFIER
OUT
\
BALANCE
VOLUME
(l(
N PRE
DUBBING
IN
JAC|(
DUBBlNG
OUT
LOUDNESS
SWTCH ELECIRONC
PROTECTOF
i MAIN
i AMPLIFIER
I
-I LOUDNE5S
)MRIGHT TOR]GHT FFl
ANNEL CHANNEL CN
DF]VEF STAGE
CH )M R
GHT
ANNEL
l- '-
8AC
t_
l
t___-
BAC(
PROTECTOR
SPEAKEI
MAIN pt
tgl SPEAI(ER
SYSTEMS
SW
ICH
LSt
tgt
|at
E}
)
REMOTE Jl-
STEREO
PHONES
Figure10.FunctionalBlockDiagram
1
;,,

TECHNICAT
DESCRIPTION
GENERAL
Figure10isablockdiagram
of
theModel22358
Receiver
showing
the mainfunctionalelements
and input and output signal
routing.Each
AM
and FM front end has its own lF stages.For
clarity,
onlytheleftaudiochannelisshown;the
right audiochannelis identical.The MONO
switchiscommon
to bothchannels. All audio
controls
are
ganged
to theircounterpartsin the
right
channel,
The left channelhalfof thefront
panel
DUBBINGlN andDUBBING
OUT
jacks
areshowninterconnectedin this diagram.
The
right
channelof.each
jack
iswiredto thesame
circuit
point
intherightchannel.
FM TUNER
SECTION
FRONTEND
- FM antennasignalsareapplied
througha baluntransformerto theantennacoil
which
drivesafieldeffecttransistorR
Famplifier,
A four section
tuningcapacitortunesantenna,
interstage
and oscillator
circuitswhich provide
exceptional
selectivity
andspurioussignalre.lec-
tion. The signals from the amplifierarefed
throughthedouble-tunedRFtankcircuitto the
FETmixerstage,whichisalso
fedby thesignal
fromthelocal
oscillator.
Carefulattentionto the
thermaland
electricalcharacteristicsof theoscil-
lator has minimizeddrift, thus obviating the
necessity
for AFC. The 10.7 MHz converted
signal
isthen
fed
tothelFamplifier.
lF STAGES
- The lF section consistsof six
transistorsand three stages
of dual element
ceratnicfilters.
The
characteristics
of thesefilters
areidealin that the 200 kHz passband
is
phase
linear,with sharp
cutoffslopes.Thisexceptional
phase
linearityassures
theeliminationof amajor
source
of high-frequencydistortionanda loss
of
stereoseparation.
Thesharpcutoffslopes
provide
improvedselectivity,
permitting receptionof
closelyspaced
channels.
The Model 22358 utilizes
svmmetricaldiode
limiter circuitsconsistingof high-performance
Gold
BondHotCarriertypediodesandlF limiter
amplifier
with averysmalldynamicsymmetrical
aperture,eliminating
theneedfor anAGCcircuit
which introduceslow frequencydistortion.Un-
desirableAmplitude
Modulation
(AM
signals,AM
noise.
AM distortion)areremoved
from the lF
signaI
withthelimiter.
STEREO
DEMODULATOR
The stereocompositesignal
obtainedfrom the
bufferamplifier
isfedto theFETmutingcircuit,
the FM OUADRADIALOUTPUT
jack
andthe
phase
lockedloopstereo
demodulatorlCcircuit
where it is decodedinto both left and right
channel
signals.Eachleftand
right
channel
signal
is then appliedto the 19 kHz low pass filter
(LPF)andde-emphasisnetworksto removethe
undesiredswitchingcarriersignalin the audio
signals.
Next,eachaudiosignalisappliedto an
audioamplifierconsistingof NPN-PNPdirect-
coupledtransistor
feedback
pairs
and
amplified
to
the requiredsignal
of about 755 mV RMS.
Finally, each amplified signal is fed to the
SELECTORswitch.
The
phase
lockedlooplC in ihemultiplexstereo
demodulatorcircuitisequippedwith a separate
automaticStereo/Monaural
switchingcircuit.The
circuit
examinesthe inputsignalintensityand
actuatesthe stereo
demodulator
andstereoindi-
catorlamp
automaticallywhen
the
input
signalis
of sufficientstrength
to provide high quality
stereoreception.When
the inputsignal
intensitv
is
insufficient
for this
purpose,
thestereo
signalis
automaticallychanged
to a monaural
signalto
ensure
quality
reception
andahighsignal-to-noise
ratio.
MUTINGCIRCUIT
Intheabsenceof anFMcarrier.all FM receivers
produce
interstationnoise.The muting
circuit
eliminatesthisnoise,
providing
noise-freetuning
fromstationto station.
A mutingcircuit consistingof a two transistor
noiseamplifieranda threetransistor
(including
oneFET)switchingcircuit,hasbeenincorporated
intheModel22358.
Themutingcircuit
perfectly
mutesout all the interstation
noise
and also
completelymutesout the sideslopespurious
responseof the unit. The circuit has been
designedto minimizeannoyingswitchingnoiseas
thetuninqband
is
scanned.
AM TUNERSECTION
The AM tunersectionof the Model22358 is
composedof onelC (incorporating anRFampli-
fier, local oscillator,mixer,lF amplifier and
detector)andthreetransistors.One
of themisa
signalstrength
indicationamplifier,whilethe
othertwo areused
for amplifying detected
audio
signals.A threesectionvariablecapacitorisused
to inserttwo tunedcircuits
intotheRF
stage
for
high selectivity and improvedspurioussignal
14

rejection
performance.
Theceramic
filtersutilized
in the AM lF amplifier
aredesignedfor high
selectivity
and
widebandwidthfor interference-
freehigh
quality
AIV reception.Followingthe
AM lF amplifier,the AM detector
recoversthe
audio
modulationand
presents
thissignalto the
modeselection
switch.The AM tuner
andlF
amplifier are subjected
to the action of an
effectiveautomatic
gaincontrol circuit which
maintainsaconstantsignallevel
forallstationsin
theAMband.
PREAMPLIFIERSECTION
TAPESIGNALS
- Withthe exception
of tape
input,all high-levelinputsarefeddirectlyto the
SELECTORswitch.Tapeinputisroutedthrough
tl.re
front panel DUBBINGlNjack
to asectionof
thETAPE1 MONITORSWitCh.
ThE
DUBBING
lN jack is
a
three-conductor
stereo
jack
which
has
two built-in switches, one for eachchannel.
Normally,theseswitchesareclosed,
allowingthe
tapeinputsignals
fromtheTAPE2 lN jack on
the rear panel to be fed to the SELECTOR
switch.
Whena
plug
isinsenedinthe
DUBBING
lN .lack,
the switchesare
opened,disconnecting
theTAPE2 lN
jacks
andallowingthesignal
from
the DUBBINGlN jack to reach the TAPE1
MONITORswitch.Thusonly onetape
recorder
at a time can feed
playback
signalsinto the
Model2235B.
TAPEMONITORSWITCH
Whenthe
TAPE
1
MONITOR
oushswitch
isinthe
"out" position,
the amplifier
circuitreceivesits
signaldirectly from the source
SELECTOR
switch.Whenthe TAPE 1 MONITOR is de-
pressed,
theamplifierreceivesitssignal
from the
output of the taperecorderconnectedto the
TAPE1
MONITORlN
jacks.
CONTROLCIRCUITS
ThecontrolcircuitsDortion
of theModel22358
consists
of the BALANCE,VOLUME, BASS,
MlD, TREBLE,and Hl FILTERcontrols.All
controlsaffectthe leftandrightchannelssimul-
taneously.
With the controls set for flat responseand
VOLUME
control
at maximum,the
overallvolt-
age
gain
from
and
high-levelinputto the loud-
speakerterminals
isapproximately40
dB.
BALANCECONTROL
The BALANCEcontrolisa wide-rangecontrol
which permits attenuation
of eachchannelto
tc
cutoff.
The
change
of attenuationineachchannel
asthe control is turnedawayfrom center
has
beendesigned
to maintaintotalapparent
loudness
frombothchannels.
Thisfeaturemakes
it atrue
stereobalancecontrol.
VOLUMECONTROL
TheVOLUMEcontrolattenuates
bothchannels
simultaneously
andmaintainstracking
towithin3
dB at any
point
of attenuationto -50 dB
from
maximum.Since
the control is situated
at the
inputof thetoneamplifier,
thereisno
po$sibility
of overloadingthe amplifierstagesunder
maxi-
mum
ratedoutputconditions.Thus,
distortion
is
keptto a minimum.
Afterattenuation
by the
BALANCEandVOLUMEcontrols,
thesignal
is
appliedtothetoneamplifier.
TONEAMPLIFIER
TheTONE
AMPLIFIER'scircuitry
usesa con-
tinuouslyvariableR-Cfeedback-typeconfigura-
tion. The signal from theTONEAMPLIFIER
feedsa6 dBoeroctavehi
filter
circuit
whenthe
Hl FILTER
pushswitch
isdepressed.
OUTPUTSTAGEAND PROTECTIVE
CIRCUITS
Thedifferentialamplifier
andpre-driver
circuit
amplify the signal
from the Hl FILTER to
sufficientlevelsto drive
theoutput
stages.
From
theinput
of thedifferentialamplifiercircuit,
the
amplifierstagesare
directcoupledthrough
to the
loudspeakers
{and headphones)
providing in-
stantaneousrecoveryfromanyoverdrivencondi-
uon.
The
output
stageconsistsof apair
of push-pull,
complementarysymmetry transistors (PNP,
NPN),
havinghighcurrentanddissipation
capa-
bilities.The electronic
protective
circuit senses
excessiveoutput currentandvoltageconditions
andlimits
thesignalto thedriver
transistorsto a
safe,
predetermined
value.
Thislimiting
action
protects
the driverand output transistors
to a
safe,
predetermined
value.Thislimiting
action
orotectsthe driverand outputtransistors
from
excessive
overdriveandshortcircuitconditions.
This instantaneousacting safety circuit gives
constantand unobtrusiveDrotection
without
causingannoying
program
interruptions.Thermal
compensationcircuits
arealso
provided
to ensure
highlystable
operationunderseveretemperature
andsignal
handling
conditions.

SPECIFICATIONS
AMPLIFER
SECTION
RATED
POWEROUTPUT. .35
WATTSPERCHANNEL,
CONTINUOUS
AVERAGE
POWER,
BOTHCHANNELS
DRIVEN.
POWER
BAND. ' ' . 20 Hzto 20 kHz
TOTAL
HARMONICDISTORTION .,,,,0.25%
LOAD
IMPEDANCE. .....80
lntermodufation
Distortion
atrated
power. ,.,.. O.25%
Damping
Factor . ...........55
Frequency
Response .......2O Hzto20kHzt0.25dB
PREAMPLIFIERSECTION
Phono:
Dynamic
Range
. ......96dB
Note: DynamicRangeisthe ratio in dB of the phonoinput overloadto equivalentinput noise.
Equ
ivalent
InputNoise 1.5
sV
100
mV
InputOverload
Sensitivities
(for
rated
power
output)
Phono. .....1.8mV
Taoe .. .....180mV
MainIn . ......1.5V
Frequency
Response
(phono)
. 30
Hz
to 15kHzt1.0
dB
Inputlmpedances
Phono. ......47kO
AuxorTape 100kO
Mainln. ......30kO
TapeOutputLevel .. ....775mY
Ref.:7.75
mVat
phono
input
Signalto NoiseRatio
AuxlnDut ....80d8
Phonolnout .. 65
dB
Tone
Controls
Bass:5o
Hz ..,, ...... 110d8
Mid:700Hz .... ...... 16
dB
Treble:15
kHz ... .... 110dB
FM TUNERSECTION
Selectivity
(alternate
carrier). ....... 65d8
Ouieting
Slope
RFlnput
for
30
dB
Ouieting ...... 1.9
pV
Ouietingat5tv RFlnput .. .....52dB
Ouietingat
10
pV RFInput .....
..58dB
Ouieting
at50
pV RFlnput ...... 68
dB
TotalHarmonicDistortion
Mono:
Stereo: O.3o/o
O.5/o
1.5dB
40dB
95
dB
70
dB
90
dB
50
dB
tr,
Capture
Ratio
StereoSeparation
at 1kHz
Spurious
Rejection
lmr^a Fl6io.ri^n
r,,,ogE Irst sv L,v, I
lF Rejection
AMSuppression

AM TUNERSECTION
Sensitivity .... .. 20
pY
GENERAL
PowerRequirements
... 120 V AC,50/60
Hz
PowerConsumptionatratedoutput,bothchannels
operating ., . . . . 180W
ldling
Power
(VolumeControl
atzero) . ........ 30W
Dimensions:
Panel
Width ..17-3/8"
Panef
Height ..5-3/8"
Depth . .. .... .. 14"
Weight:
Unitalone ....26.4 |bs.
Packedfor shiDment . . . 36.4
lbs.
17

MAINTENANCE
CLEANING
Thesatin
goldanodized finishof theknobsand
heavyaluminum
front panel will lastindefinitely
with proper care and cleaning.
NEVER use
scouring
pads,
steel
wool,scouring
powders,
or
harshchemical
agents,such
aslyesolution.These
will mar the finish.Clean
with a soft,lint-free
cloth or cotton swab
slightlydampened
with a
mild
solutionof detergent
andwater.
FUSE
REPLACEMENT
TheModel22358is
protected
by a0.5Amp250
V fuse.In theevent
thefuseblowsout,
replaceit
ON
LY with a fuseof the sametypeand
rating.
Replacement
with afuseof higherrating
will not
protectthe instrumentand will void the war-
ranty.
IN CASE
OF DIFFICULTY
lf the receiveroperates
normally,
but the dial
lamp
does
not light,thenthe lamp(s)
probably
requires
replacement.
lf the receiverdoes
not
operate,
make
surethepower
cordisconnected.
lf the power
cord is all rightand
your unit is
equipped
with anexternal
ACline
proteclor
fuse,
check
the fuse and
replace
it if necessary.lf the
dial
lampis
properly
illuminated
but
onechannel
isinoperative,
checkthe loudspeakercord
of the
inoperative
channel
for a shortcircuit,
broken
wire, looseconnection
or other fault. lf the
loudspeaker
connections
appear satisfactory,
check
for a broken,open,
shorted,corroded,or
disconnected
shielded
cablebetween
thereceiver
and the input equipment.
Check
for improper
setting
of the BALANCE
control.Look
for any
other
visible
fault. lf no fault isnoted,turnoff
the audio
system,thentranspose
(leftfor right)
theshielded
sourceinput
cablesatthe
receiver.lf
the oppositechannel
becomes
inoperativewhen
turned
back
on.theneither
theshieldedcableor
the input equipment
is at fault. lf the same
channel
remains
inoperative,
turn of{ power and
similarly
transpose
the
loudspeakercords.lf when
the system
is turnedon therestill is no sound
from the samespeaker
system,theneither
the
lor.rdspeaker
systemorthe loudspeaker
cordisat
lault. lf the opposite
speaker
system
fails to
operate,
then
thereceiver
isinoperative.Referthe
problem
to your nearest
Authorized
Marantz
Service
Facilitv.
REPAIRS
Onlv the mostcompetentand
qualified
service
technicians
should be allowedto servicethe
Model22358. The Marantz
Companyand its
factory-trained
warranty
station
personnel
have
theknowledge
andspecial
equipmentneeded
for
repair
and calibration
of this precision
instru-
ment.
In the eventof difficulty, referto the list of
Authorized
MarantzService
Stations
packed
with
theModel 22358
orwritedirectlvto thelocation
listedbelow for the nameand address
of the
MarantzAuthorized
Service
Stationnearest
your
homeor business,
Please
includethe modeland
serial
numberof your unit together
with a full
description
of what you feelis abnormal
in itsin
benavlour.
MarantzCompany,
Inc.
NationalService
Dept
P.O.Box577
Chatsworth,
CA
91311
u.s.A.