SU-9O11 stereopreamptifier

withBuitt-tn forMc cartridge

Pre-Preamp
Built-ln Mixing Circuit Lets You Jam
with Any Source.
Play or sing along with records.tapes.or
broadcastsby plugginga high quality
microphoneinto the front panelinput jdck.
Adjust volumeto blend into the rest of the
music with the mic levelknob.
The specialmixingcircuitpreventssource
impedancefrom affectingthe output.Signal-
to-noiselevelis a high 73dB(lHF,A);
frequencyresponseis f lat and wide:
2OHz- 45kHz,-3dB; 0 - -0.1dB at 10kHz.
An independentset of rear panel output jacks
makes it easy to recordyour performance.

Center-Defeat, Unique Tone Control

Circuitry.
In the centerposition,tone controlcircuitryis
Our Direct Approach to Fidelity Gives pianissimoagainsta backgroundof completelydisconnectedso that frequency
You More Exciting Music in a Smaller unobtrusivesilence.With the MC input, resoonseis accurateand flat. Tone control is
Package. distortion is a mere 0.02"/"at a preamplifier by class-AdrivenlC's for low noiseand low
The new SU-9011brings you clearer,more output of 1V (2OHzto 20kHz). distortion.
precisereproductionbecauseit representsa Our own original low noise transistors,the
more direct design approachthan was M47LPare in large part to thank for these Input and Output Selectors Designed
previouslypossible. impressivefigures. for ldeal Switching Performance.
Innovationsincorporatedin our previous Both the input selectorknob and tape
Technicscomponents preparedthe way for Remole Action Switch, Gold-Plated monitor selectorare designedso that actual
the SU-9011, allowingus to makethis preamp Input Jacks, LED Indicator lor MC switching takes place at the ideal locationon
both more compact and more accurate. Operation. the circuitboardsfor minimumsignal
SwitchingbetweenMM and MC in the degradationand crosstalk.
"phono 1" positionis by a new tyPeof
remote action switch. This originaldevice Stabilized Voltage Power Supply lor All
Low Noise MC Pre-PreamPBuilt'ln. transfersthe actual switching operationfrom Circuils.
The SU-9011has two phono inputs,one for the front panelto the idealpoint within the This extremelystable power supply provides
MM only,and one for eitherMC or MM circuitryso there is no dangerof hum. the basisfor accurateamplificationof the
cartridges.You can plug your MC cartridge The phono 1 input jacks are gold platedto transientswhich make up music.The
output directlyinto the SU-9O11 and enjoy ensuresmooth signaltransmissionfrom transformerfeaturesmagneticshieldingof
better fidelity than if you used a separate cables to preamp. the coil surface for much better leakagef lux
step-uptransformer.Why? Becausethe built- Another extra is the front panel LED that preventionthan in the conventionalcut-core
in pre-preamp is not only an impeccable lights up when the pre-preampis switched on. type. The rest of the extra large power supply
pieceof electronicsin itself,it is right in with circuit is also shieldedto preventadverse
the rest of the preampcircuitry so you don't influenceon the signalcircuitry.
sufferfrom mismatchingor the warped
frequencyresponseand noise that can come Minimized Gang Error in Volume
from using two sets of phono cables.The Control.
extremelyhigh signal to noise ratio of 69dB This highlyaccuratevolumecontrolhas been
(lHF,A) is strikingfor an MC pre-preamp. designedfor minimumgang errorand
Sincethis is equivalentto a noise minimuminfluenceon frequencyresponse.
input of -152d8V,you hearthe quietest Evenat low volume levels,the high range is
not deemohasized.

Subsonic Filter.
Switchon this 30H2,-12dB/octfilter when
88dB S/N with MM Phono lnput. you need to cut out harmful low range noise
When you use MM cartridgesyou'll also such as rumble or recordwarp frequencies.
enjoy a higher signal-to-noise-ratio.
Referencedto an input of 2.5mV,S/N is SBdB High filter
(lHF,A) which meansthat the noise levelis Use this 7kHz,-6dB/oct filter to cut out high
1/25,000of the signal level.The phono frequency noise such as tape hiss and record
equalizeramp featuresM47LP low-noise scratches.
transistorsin the differentialfirst stagewith
currentmirrorloading.This is followedby a
Phono (MC) THD vs. InPut Level Phono (MM) THD vs. InPut Level
voltageamp and SEPP output stage in a
class-Aconfiguration.Thanks to careful
selectionof circuit elements,RIAA
equalizationis +0.2d8 from 30Hz to 15,000H2.
SE-g O21 DCPower
stereo irier
Ampr
logarithmiccompressioncircuit.
These meters havea wide rangeof from
0.001Wto 120Wwith a precisionthat gives a
OdB readingeven for a single wave of a
10kHzfrequency.

3-Stage Darlington Output Stage.

The output stage has high linearityand low
output impedancethanks to 3-stage
Darlingtonconstruction,an improvementover
the conventional2-stageDarlingtontype.

Newly Developed Large El Core

Transformer and Large Electrolytic
Capacitors.
With two 6,8001rFelectrolyticcapacitorsfor
each channel,the total comes to 27,2OO{F.
The El core transformerfeaturesspecial
AnolherStepTowardsthe ldealPower less at rated oower over the entire audio resins havingoutstandingthermal
Amp. soectrum trom zOHzto 20kHz.While this is conductivitycharacteristics.The resuli is a
Electronicsengineerslike to describethe an impressively high figure,note that at half power supply section that handlesthe
idealamplifieras a wire havinggain.In other the rated power THD drops to an dynamiccharacteristics of musicalsignals
words,the idealamp would amplifythe input infinitessimal0.005%(20H2to 20kHz),so low with ease.
signal as is, without adding colorationor as to be nearlyunmeasurable.
affecting phase relationships.The SE-9021 Speaker Switch Relay and Protection
comes remarkablyclose to this dream. lt is a DualTransistorFirstStagefor Stable Circuitry
irue DC amp with virtuallyflat responsefrom DC Handling. We haveemployedrelaysfor speaker
OHzto 100kHz.Originalphaserelationships Insteadof the conventionalFET's,we have switchingto reducethe numberof contacts
are maintainedwithin the audio spectrumso takenthe unusualstep of using dual and minimizethe influenceof switch contact
you hearmusicthe way it sounds"live." transistorsto form the first stage differential impedance.These briefly turn off the
amplifier.This stage is current mirror loaded speakersduringon/off amp switchingand if
and the followingstagesare in a floating the protectioncircuitry detects upstreamDC
Advanced DC Amp Circuitry Delivers state so that even if there is thermal drift, it leakage.The output transistorsare also
60W + 60W (both channels driven into will not causeDC potentialto drift.With protectedby the relaywhen there is a short
8ohms,20Hz to 20kH2,0.01% THD). carefullymatched transistorsand stabilized circuitat the outout terminals.
DC amplificationgives you accurate voltage power supply for the voltageamp
reproductionof lower harmonicspreserving stage,very stable operationis ensureddown Signal-to-Noise Ratio ol 113d8 and Flat
phaserelationships unaltered.lt is achieved to DC. Response.
'113dB
by the latest circuitry which eliminatesnot S/N (lHF, A) means no matter how
only input and output capacitorsbut also Precision Peak Melers Indicate even a quiet the musical passagebeing reproduced,
coupling capacitorsbetweenstages.With Single Wave at 10kHz. it is unlikelyyou will everbe botheredby
60W per channeland a superb damping With an incrediblyfast rise time of loqrsec or noise. Frequencyresponseis so flat from
factor of 100,the SE-9021amplifiesall the less, these precisionpeak meters give you 2OHzto 20kHz,+0d8, -0.1d8, that you could
dynamismof a full orchestrawith the detailed accurate indicationsof even the shortest hardlyask for more linear reproduction.
expressionthat allows you to pick out peak transients.
individualinstruments. This remarkablespeed and accuracyis DC/Low-Cut Filter Switch.
achievedwith a high performancelinear The low-cut filter can be switched on for
Gain,Phasevs. FrequencyResponse detector based on an op amp lC along with a added speakerprotectionwhen necessary.

Power Heat sink Protectionrelavs

transformer

Powertransistors

OutputPowervs.THD
Electrolytic
capacitors
6,800prFx4

for
mrnrmrzrng
DC drift

0.01% THD for Clear,Undistorted

Reproduction. Meterdrivecircuit Drivercircuit
distortionis a mere0.01% or
Totalharmonic
 FM/AM runer
stereo 'tridge
ST-9O31
High Sensitivity, High Selectivity AM Jam
Reception.
Featuringa narrow band ceramic filter, the es,or
AM circuitrygivesyou a high selectivityof ty
40dB so you can pick up stations clearly ut jack.
even at night when the air waves are t of the
crowded.
source
lnput Signalvs. Oulput& S/N rt.Signal-
);
: 10kHz.
rtputjacks
Tance.
a
I rtrol

; circuitry
is
The One Tuner with Lower Distortion characteristicscan be fixed independently. |quency
and Higher Selectivity. The other contributor is a set of two 6 controlis
Now you don't haveto choose between 4-elementceramicfilterswith excellent and low
high selectivityand low distoriion. narrow band group delay characteristics.
The ST-9031,through the carefulchoice of Amplificationis by an all-stagedifferential
high performancecomponentsand S-stageamplifier featuringtwo lC's having ;igned
advanceddesign,gives you both these high stabilityand superror[miter 3.
essentialfeaturesin singleexceptional characteristics. pe
AM/FM stereotuner. This lF stagegivesyou a high selectivity at actual
of 75dB with no more than 0.08%THD cation on
THD 0.08% (1kHz, mono), Selectivity (1kHz, mono)0.1"/"(1kHz,stereo)so you al
75d8. get just the stationyou want with exciting
You need high selectivityto slice out the clarity.
station you want from the other stations y for All
on the FM dial.But the problemin the Wide Flat Frequency Response.
past was that if you wanted higher For accuratereoroductionof broadcasts provides
selectivity,you usually had to settle for you need as wide and flat frequency of the
higherdistortionalong with it. With the resoonseas oossible.Besidesthe wide le
new circuittechnologyand componentsin range,low distortionFM detectorcircuit, {inn n{

the ST-9031you don't haveto the Chebyshev-typelow pass filter used <ageflux
compromtse. after the MPX stage also contributesto cuI-core
The SAW (surfaceacoustic wave)filter flat frequencyresponse:+0.2d8,-0.8d8 /er suppry
providedone means to solve this problem from 20Hz to 15kHz. lverse
since its amplitudeand groupdelay
Clearer, More Precise Stereo
Reproduction : 50dB Separation Output Level& Stereo A

(1kHz). ChannelSeparation
Attackingjitter was one of our prioritiesin has been
designingthe ST-9031. Jitter distortion rd
occursas an unwantedsignalelement rponse.
when the pilot signal"beats" with the range rs
modulatedsignal.In this unit we have
employeda specialjitter elimination
circuitthat gets rid of this distortionin
the MPX stereodemodulationcircuitry. 9 r when
This is accomplishedwith a narrow-band ge norse
band-passfilterand differentialamp so - rencies.
FM Selectivity that the MPX lC is suppliedwith a pure o
pilot signalwithoutdistortion.
While separationat lkHz is 50dB,the high out high
range improvementshows up as 40dB at nd record
10kHz.

High Sensitivity Front End.

a With high gain and stability,4-poleMOS Total HarmonicDistortion
= FET ensuresexcellentsensitivityto pick
I
t
up weak stations along with the overload
'6 resistanceto handlestrongersignals.The
4-gangedvariablecapacitorfor tuning
adds to the sensitivityof the RF stage.
Usablesensitivityis a high 1.9pV(lHF '58),
46dB stereo quieting sensitivityis 2fuV
75a).

Linear Signal Strength Meter and FM

M€$uilng irgquency sgMH!
Center Tuning Meter.
Anlenn€l6pullmpedance @Q
Inr.d€r6.ce 3rgndr modur.rion lM
These highly accuratemeters make
Inred.renceldesned eiqnarourpur 6[0 -30d
accuratetuning easierand faster.The
tltttttl signalstrengthmeteris helpfulfor finding
Frequency devialion (kH?) ootimumantennadirection.
 (DlN45500)
Specifications
Technical
Total harmonic distortion (20H2- 20kHz) TREBLE 2OkHz,
P H O N O1 M C 1V output(volume +8dB ! -BdB
at -20dB) 0.02% S u b s o n i cf i l t e r 3 0 H 2 ,- 1 2 d B / o c l
3V output(volume High filter 7kHz, -6dB/oot
at odB) 0.03% Loudness control (Volume at -30d8)
P H O N O1 M M . P H O N O2 50H2,+9dB
1V output(volume Output voltage & imPedance
at -20d8) 0.01% OUTPUT,MIXING REC OUT
su-9011 3V output(volume
at odB) 0.008%
rated
max
- I , 2R E C O U T
'l V/6004
5V/6004
AMPLIFIER SECTION Tuner, AUX 1V output(volume TAPE
at -20d8) 0.008% 150mV
I n D u ts e n s i t i v i t y& i m P e d a n c e Rated total harmonic distortion REC/PLAY 30mv/82k4
3V output(volume
PHONO 1 MC 70rV/104 0.008%
at odB) 0.005% Chlnnel separation
PHONO.IMMP , H O N O2 s/N 53dB
Frequency response AUX,1KHZ
2.5mV/47k92 rated output
P H O N O1 M C 62dB(lHF A:69d8) P H O N O1 , 2 BIAA standard
Tuner,AUX 150mV/47kO
curve 10.2dB GENERAL
TAPE 1, REC/PLAY 180mv/47k4 P H O N O1 M M , P H O N O2
7 5 d B( l H F A : 8 8 d B ) (30H2- 1skHz) P o w e rc o n s u m p t i o n 1 6 W
TAPE 2 150mv/47k4 '1101'l2ol220l
Tuner, AUX 2oHz* 20kHz Power supply AC
MIC 4mv/10k4 Tuner,AUX 85dB(lHF A: 100d8)
Mtc 65dB(lHF A: 73dB) +0dB, -0.2d8 240V, 50/60H2
P h o n o m a x i m u m i n P U tv o l t a g e
-26d8 outPut sHz - 40kHz Dimensions(WxHxD)
(1kHz, RMS) -1dB 430 x 98 x 285 mm
PHONO 1 MC 6mV P H O N O1 M C 6OdB
Mrc 2 0 H z- 4 5 k H z (16-15/16'',
P H O N O1 M M , P H O N O2 P H O N O1 M M , P H O N O2 x 3'27132'
62dB +0d8, -3dB
200mV x 1t-7t32"\
Tuner,AUX 63dB Tone control
M I C m a x i m u mi n p u t v o l t a g e( 1 k H z ,R M S )
Mrc 60dB BASS 50H2,+8dB - -8dB Weight 4 . 8 k g ( 1 0 . 6l b )
1 0 0 m V( T H D 0 . 0 5 % )

lnlermodulation distortion Channel balance AUX,250Hz - 6300H2

rated power al 250H2:8kHz= 4:1, 4a r0.1dB
'
0.015% Channel separation
rated power at 60Hz7kHz= 4i1. A U X ,I K H Z 75dB
SMPTE,8A O.O1"/" METER SECTION
P o w e r b a n d w i d t hb o t h c h a n n e l sd r a v e n , Attack time 100ssec
-3dB sHz - 45kHz (4o) Recoverytime 750msec(0- 20dB)
5Hz - 60kHz (8O) Meter range +3dB - -50d8

sE-9021 R e s i d u a lh u m & n o i s e0 . 2 m V( 0 . 1 m V ,
IHFA)
GENERAL
Powerconsumption 6'10W
Damping factor 50 (44), 100 (84) Power supply AC 110112012201
AMPLIFIERSECTION Total harmonic distortion Headphones output level & impedance 240V,50/60H2
20Hz * 2OkHzpower outPUt rated power 500mV/33092 Dimensions(WxHxD)
both channels driven a t 2 O H z- 2 0 k H z 0 . 0 1 % ( 4 4 , 8 4 ) Load impedance 4 3 0x 9 8 x 3 3 1 m m
65W x 2 (44) at 4OHztu 16kHz 0.01"/. (4o, 8a) MAIN or REMOTE 4a - 164 (16-15/16"
60w x 2 (84) at IkHz 0 . 0 1 %( 4 9 , 8 a ) MAIN + REMOTE 8() - 16() x3'27132"
halt rated power I n p u t s e n s i t i v i t y& i m P e d a n c e x 13-.1/32")
40Hz - 16kHz power output
both channels driven at 2OHz 20kHz 0.005% (44,8a)
tu 1V/47k4 Weisht 1 0 k g( 2 2 . 1l b )
65W x 2 (44) at lkHz 0.0035% (44) s/N 100d8
60w x 2 (8a) 0.0025% (84) ( 1 1 3 d 8 I, H F A )
1k H z c o n t i n u o u sP o w e ro u t p u t -26d8 rated Power at I kHz Frequency response 0Hz - 100kHz
o.01% (49)) (- 1dB)
both channels driven
50mW power at 1kHz +0d8, -0.1dB
75W x 2 {44)
65W x 2 (8a) 0 . 0 1 %( 4 4 ) (2OHZN 2okH.zl

Alternate channel selectivity Antennaterminals 3004(balanced),

75dB 754 (unbalanced)
Capture ratio 1.0d8 A M T U N E RS E C T I O N
lmage rejection at 98MHz Frequency range 525 tu 1605kHz
75dB S e n s i t i v i t yS / N 2 0 d B
lF rejection at 98MHz 30gV,250sV/m
10 0 d B Selectivity 40dB
Spurious response rejection at 981\4Hz lmage rejection at 1000kHz
sr-9031 AM suppression
90dB
55dB lF rejection at l000kHz
45dB

Stereo separation 40dB

F M T U N E RS E C T I O N IHF S/N 46dB stereo lkHz 50dB GENERAL
88 - 108 MHz q u i e t i n gs e n s i t i v i t y 10kHz 40dB Output voltage 0.6V (fixed)
Frequency range
22yv Qsal Carrier leak P o w e rc o n s u m p t i o n 1 3 W
Sensitivity (t40kHz deviation)
S/N3OdB 1.9pV(3004), Total harmonic distortion lgkHz r -58d8 (-60dB, IHF) P o w e rs u p p f y AC 11Ol12Ol22Ol
MONO 0 . 0 8 %( 1 k H z ) 38kHz -63dB (-60dB, IHF) 240V, 50/60H2
1.3rV (754)
1.7sV(3004), STEREO 0.1% (1kHz) Channel balance Dimensions(WxHxD)
s/N 26dB
1.1rV (75()) S/N (r40kHz deviation) 250H2tu 6300H2 11.odB 430 x 98 x 300 mm
MONO 6 9 d B ( 7 5 d 8 ,r H F ) L i m i t i n gp o i n t 1.59V ( 16 - 15 / 16 "
SiN 2OCB 1.59V(3004),
6 5 d B ( 7 0 d 8 ,I H F ) Bandwidth x 3-27132"
0.9rV (754) ST€,R€O
Frequency response 20Hz - 1skHz lF amplilier 250kHz i i1.13/16')
lH F usable sensitivjty
' +0.2d8, -0.8d8 FM demodulator 1000kHz Weight 4.5ks (9.9 lb)
1 9/V (lHF'58)

Dependingon markelcountry.actual productappearanceand facilitiesmay slightlydiffer from the photograph

Technics
'Electric
Matsushita
SD8FO2OE2 S p e c i f i c a t i o ns u b i e c t t o c h a n g e w i t h o u t n o t i c e . P r i n t e di n J a p a n