su-v6
Content
you can obtainthe best of With this amplifier, both worlds.Technics'"New ClassA" amolifier circuitcombinesclassA outputwith stableload conditionon all stages.Also,the undistorted soundqualityof class A and the efficient, highoutputpowerof class B are available withina You don't haveto trade singleamplifier. efficiencyand pricefor soundquality,or switchingdistortionfor highoutput. The SU-V6'sfacts and figuressupportthese claims:70 watts per channel,both channels driven into B ohms,trom 20 Hzto2O kHz with no more than O.OO7% total harmonicdistortion. The most importantfact,though,is thatthis
integrated amplif ier's faithf ully reproduced sound exhibitsthe effortlesssmoothness of true class A amplification. And yet all this is available at a fractionof a conventional classA amolifier's cost.
NewGlassA and StraightDC ProvideBoth Qualityand Quantity
soundand quantityof Qualityof reproduced outputpowerare the two generalaimswe were strivingto developin the advancedcircuitry incorporated in the SU-V6. To test the successof our circuitdesigns, we have employeda new methodof analysis called3DA (firstused in the development of the SU-8099integrated amp),whichstandsfor "3-Dimensional Analysis."With the aid of a computer,this systemenablesus to test performance at 4,000 pointsand expressthe graphicform. Fromour resultsin 3-dimensional extensiveresearchusing3DA, we havefound that performance requirements withinthe audio spectrumare bestsatisfied by building amplifiers that exhibitgood performance characteristics
Class B amplilieroutput wavefom and distortion wavefom (at 20 kHz)
New classA amplifier outpul wavefom and distortion (at wavefom 20 kHz)
from 0 Hz (DC)at the bottomof the frequency range,all the way up to nearly100 kHz in the ultra-highrange(it's undesirable to go much higherthan this point,givencurrently available circuitcomponents). To achieveoerformance withinthese considerations, we have useda numberof advancedcircuitconfigurations, the two most importantof which are "New ClassA" and "Straight DC."
Output TransistorCurrentWaveform
NewClassA with SynchroBiasfor Better High Frequency Response
Transistor switchingis a majorcauseof highfrequencydistortionin class B and classAB amplifierdesigns.ln class B designs, two outpul transistors The are used for eachchannel. "upper" transistor handlesthe positive halfof the waveformand the "lower" transistor handles the negativehalf.But problems occurwhenthe signalcrossesthe zero point;one transistor turns off and the otherturns on. Duringthis crossover, "switchingdistortion"is generated. This takes the form of briefpulseswith very sharppeaks, which producehigh-orderharmonic distortion. NFB (negative feedback)does not copewith effectively, switchingdistortion despiteits usefulnessin combatingordinaryformsof distortion. This switching distortion can also resultin intermodulation which distortion muddiesreproduced soundto a greaterdegree
than might be expected from a simple examination of an oscilloscopetrace. In class A, the same transistor handles the entire waveform, but a largeidlingcurrentis required to operatethe transistor even when there is no audioinput signal.Althoughthis preventsany form of switchingdistortion, it also resultsin very low efficiency. Large heat sinks must be providedto dissipate the substantialamount of excess heat that is created.Price is correspondingly high. In our New ClassA circuihy,the outputtransistor bias current is synchronizedwith the positiveand negativeswingsof the.input signalso that the output transistorsare always in an active state. With this remarkable circuitry, switching distortionis eliminated sincethe transistors are never allowed to switch off. Because of this synchronized operation, we call this "synchro bias." Besidespreventing switching distortion in the output waveform, it also presents linear load conditionsto the voltage amplificationstage. Predriverloadfluctuation is also minimized. The resultis the virtualelimination of "crossover distortion."
create the shortest possibleconnections. With the additionof low impedance laminated bus lines,the power supplyloop was minimized. Anotheradvantage of CPB is that it virtually eliminates significant in performance differences you can between individual units.Consequently, expect a maximumO.OOTo/o THD for anv individual SU-V6 amp.
HeavyDuty PowerSupplies
In an audio amplifier, thepower supply must be in impedance ableto meetthechanges presented bythespeaker systems. Depending thisfigure from on thefrequency, canrange fora below 4 ohmsupto as highas 30 ohms ratedat 8 ohms. speaker system IntheSU-V6, independent rectifier andripple filtercircuits forthe leftandright areprovided channels to assure trulystableDCpower. Furthermore, thepowertransformer coilsfloatin a special resinwithinshielded casesto prevent power supply hum.
ICL PhonoEQ CircuitEmplovinq ' Ultra-LowNoiseFETs Pei'miis DirectMCCartridgeConnection
The first stage of the phono equalizeris a differential with ultra-lownoisedual amplifier FETs. As a result,no inputcapacitors are necessary.A mere increasein equalizer gain, rather than an additional pre-preampor step-up transformer, is all that is neededfor MC cartridge compatibility.When the amp is in the straightD-C mode,the onlycapacitorin the entireampcircuit, whetherthe inputis MC or MM, is the EQ output capacitor.
RecordingSelector Independent with 2-WayDubbing
youcanrecord Withthisversatile arrangement whilelistening fromonesource to another since the inputandrecording selectors areseparate. Tapeinputsarepositioned on boththeinput selector andthe recording selector sothatyou whilelistening to another can record source (such if youwish. as a disc),
for "Straight DC" Configuration DirectCouplingBetweenDCPower Amp Sectionand High LevelInput Signals
The SU-V6's designtakesfull advantage of the phaseexcellent low-range f requency response, linearity, and low distortioninherentin our refinedDC pourer amp design.By increasing the gain of the power amp section,we have made it possible to directlycouplehighlevelinputs, such as tuner, tape, and AUX sources,to the power in low amp input.The resultingimprovement range fidelity is a good example of what can be achieved with an innovative,yet uncomplicated, approach to integratedamp design. In fact, you couldview this configuration as simplya phono equalizerand a DC poweramp. Whilethis characterizes the "simple is best" philosophy, innovations were some additional necessary to obtain the desired performance goals.Firstof all, a high-gainamp is required to raisetypical "high level" inputsof 150 mV200 mV to outputlevelsof 70 W-100 W. Furthermore,any tendency toward temperature deoendentDC drift must be avoidedsincethe amp's gain extendsallthe way downto DC in the low range. To obtainhighgain,Technics'SU-V6amp employsa linearcascode,3-stageDarlington which provides configuration excellent openloopperformance. As a result, only45 dB NFB is requiredto achievethe 0.007%fHD ratingat 70 Woutput. To combatDC drift, 1-chipdual FET's are used for the first stagedifferential amplifier. Sincethis prevents mutual temperaturedifferences,DC drift is reducedto a mere + 10 mV from - 10'C to
RemoteAction SwitchesEliminate ExcessWiring
Remote action switches are employedon the inputselector,recording selector, and phono selector. Therefore, switchingtakes place at the ideal location withinthe circuitry. This contributes to soundqualityby minimizing the chances of signal degradationdue to extensivewiring.
Other Features
oHigh filterto cut out high frequency noisesuch as record scratches and tape hiss. oFront-panel speaker selector lets you select either of two pairs of speaker systems (A or B) or both at once (A+B). aTone controls defeated at center oosition setting.
+50'c.
ConcentratedPowerBlock (CPB) PreventsDistortion from Electromagnetic Induction
clean high rangeresponse With the strikingly obtained from our New Class A synchro bias circuitry, we made sure that nothingwould interfere with proper performanceunder practical signalhandlingconditions. Our concentratedpower blockwas developedto prevent electromagneticinductionbetween those portions of the circuitrywhich handlelarge amounts of current and those which handle smallersignals.The powersupplyand output stage were concentratedin one integratedunit to
RearPanelFacilities
89
ffi
:: ,:Y
(p'(p (b
17
10
1 . PHONOinputs
11
a .,r) $ xww n wq
ST-S7 and SU-V6 FM/AM StereoTuneris iust the right The ST-S7 Quartz Synthesizer stylingand companionfor your SU-V6.With the sameclean,attractive performance it perfectly complements the SU-V6 standards, outstanding Integrated DC Amplifier.
2 . TUNERinputs
AUX inputs A outputs TAPE DECK I Recording 5 . TAPE DECK 1 Playbackinputs outputs 6 . TAPE DECK2 Recording
7. 8. 9. 10. '1 '1 .
TAPE DECK2 PlaybackinPuts Groundterminal Speakerterminals(main) Speakerterminals(remote) Voltage adjuster
poweroutput 20 Hz-20 kHz continuous 80Wx2 (4()) both channelsdriven 70Wx2 (8cl) poweroutput 40 Hz-1 6 kHz continuous B0Wx2 (4O) both channelsdriven 70Wx2 (80) poweroutput 1 kHz continuous 90Wx2 (4O) both channelsdriven 74Wx2 (8O) Total harmonicdistortion rated oower o.o2%ga) at20 Hz-2O kHz al 40 Hz-16 kqz at 1 kHz
level* ,tP"H3?,Uraaon output Headphones
Load imoedance MAIN or REMOTE MAIN and REMOTE & impedance Inputsensitivity PHONOMM MC TUNER,AUX TAPE 1, REC/PLAY TAPE2 Phonomaximuminputvoltage at 1 kHz. RMS.THD 0.01 % MM MC rated power4() PHONOMM MC AUX TUNER, -26 dB power4ft PHONOMM MC TUNER,AUX 50 mW power4O PHONOMM MC TUNER,AUX 4()-16() 8f)-16() 2 . 5 m V / 4 7k Q 170 p.V/474 150 mV/36 ko 170 mV/39 kO '150mV/36 ko 1 5 0m V 1 0m V
(8o) 0.007% 0.o2%ga) (8o) 0.007% (4o) 0.01% (8o) 0.007%
s/N
half power (8o) at 20 Hz-2O kHz 0.007% (8o) at 1 kHz 0.003% -26 dB power at 1 kHz 0.05%(4()) 50mWpoweratlkHz 0.08%(4o) Intermodulation distortion rated power O.O2% at 250 Hz:8k{z=4:1 ,4Q at60Hz:7 kHz:4:1, SMPTE,8A 0.0O7% both channelsdriven,-3 dB Powerbandwidth THD.0.03%,5 Hz-60 kHz (4o) THD.O.O2%, 5 Hz-60 kHz (8O) Residualhum & noise (StraightDC) 0.3 mV 30 (4O),60 (8O) Dampingfactor
78 dB (86 dB, rHFA) 68 dB (68 dB, rHFA, 250 pV input) 9 2 d B ( 1 0 6d B , I H FA ) 67 dB 65 dB 68 dB 64 dB 62 dB 65 dB
Frequencyresponse RIAA standardcurve +0.5 dB PHONO (30 Hz-l5 kHz) TUNER.AUX.TAPE (Straight DC) DC-150 kHz (-3 dB) +0, -0.3 dB (2OHz-2O kHz) Tone controls 5 0 H z ,+ 1 0 d B - - 1 0 d B BASS 2 0 k H z ,+ 1 0 d 8 - - 1 0 d 8 TREBLE 7 kHz, -6 dBloct High-cutfilter 20 Hz, -12 dB/oct filter Subsonic Loudnesscontrol (volume 50 Hz, +9 dB at -30 dB) Outputvoltage& impedance 1 5 0m V REC OUT 30 mV/82 kO REC/PLAY Channelbalance + 1 . 0d B AUX, 250 Hz-6300 Hz Channelseparation 55 dB AUX,1 kHz GENERAL Power consumption Powersupply 760 W AC 110/120/220/240V, 50/60 Hz WxHxD) mm 430x153x351 D i m e n s i o n(s (16-15/16" x 6-1/32" x 13-1 3/ 16") 12.5kg (27.6lb) Weight by Note: Total harmonicdistortionis measured the digital spectrum analyzel (HP3045system).
Technics
OE2 SD8OFOl Specifications subject to change without notice.
Matsushita Electric
Printed in Japan.
integrated amplif ier's faithf ully reproduced sound exhibitsthe effortlesssmoothness of true class A amplification. And yet all this is available at a fractionof a conventional classA amolifier's cost.
NewGlassA and StraightDC ProvideBoth Qualityand Quantity
soundand quantityof Qualityof reproduced outputpowerare the two generalaimswe were strivingto developin the advancedcircuitry incorporated in the SU-V6. To test the successof our circuitdesigns, we have employeda new methodof analysis called3DA (firstused in the development of the SU-8099integrated amp),whichstandsfor "3-Dimensional Analysis."With the aid of a computer,this systemenablesus to test performance at 4,000 pointsand expressthe graphicform. Fromour resultsin 3-dimensional extensiveresearchusing3DA, we havefound that performance requirements withinthe audio spectrumare bestsatisfied by building amplifiers that exhibitgood performance characteristics
Class B amplilieroutput wavefom and distortion wavefom (at 20 kHz)
New classA amplifier outpul wavefom and distortion (at wavefom 20 kHz)
from 0 Hz (DC)at the bottomof the frequency range,all the way up to nearly100 kHz in the ultra-highrange(it's undesirable to go much higherthan this point,givencurrently available circuitcomponents). To achieveoerformance withinthese considerations, we have useda numberof advancedcircuitconfigurations, the two most importantof which are "New ClassA" and "Straight DC."
Output TransistorCurrentWaveform
NewClassA with SynchroBiasfor Better High Frequency Response
Transistor switchingis a majorcauseof highfrequencydistortionin class B and classAB amplifierdesigns.ln class B designs, two outpul transistors The are used for eachchannel. "upper" transistor handlesthe positive halfof the waveformand the "lower" transistor handles the negativehalf.But problems occurwhenthe signalcrossesthe zero point;one transistor turns off and the otherturns on. Duringthis crossover, "switchingdistortion"is generated. This takes the form of briefpulseswith very sharppeaks, which producehigh-orderharmonic distortion. NFB (negative feedback)does not copewith effectively, switchingdistortion despiteits usefulnessin combatingordinaryformsof distortion. This switching distortion can also resultin intermodulation which distortion muddiesreproduced soundto a greaterdegree
than might be expected from a simple examination of an oscilloscopetrace. In class A, the same transistor handles the entire waveform, but a largeidlingcurrentis required to operatethe transistor even when there is no audioinput signal.Althoughthis preventsany form of switchingdistortion, it also resultsin very low efficiency. Large heat sinks must be providedto dissipate the substantialamount of excess heat that is created.Price is correspondingly high. In our New ClassA circuihy,the outputtransistor bias current is synchronizedwith the positiveand negativeswingsof the.input signalso that the output transistorsare always in an active state. With this remarkable circuitry, switching distortionis eliminated sincethe transistors are never allowed to switch off. Because of this synchronized operation, we call this "synchro bias." Besidespreventing switching distortion in the output waveform, it also presents linear load conditionsto the voltage amplificationstage. Predriverloadfluctuation is also minimized. The resultis the virtualelimination of "crossover distortion."
create the shortest possibleconnections. With the additionof low impedance laminated bus lines,the power supplyloop was minimized. Anotheradvantage of CPB is that it virtually eliminates significant in performance differences you can between individual units.Consequently, expect a maximumO.OOTo/o THD for anv individual SU-V6 amp.
HeavyDuty PowerSupplies
In an audio amplifier, thepower supply must be in impedance ableto meetthechanges presented bythespeaker systems. Depending thisfigure from on thefrequency, canrange fora below 4 ohmsupto as highas 30 ohms ratedat 8 ohms. speaker system IntheSU-V6, independent rectifier andripple filtercircuits forthe leftandright areprovided channels to assure trulystableDCpower. Furthermore, thepowertransformer coilsfloatin a special resinwithinshielded casesto prevent power supply hum.
ICL PhonoEQ CircuitEmplovinq ' Ultra-LowNoiseFETs Pei'miis DirectMCCartridgeConnection
The first stage of the phono equalizeris a differential with ultra-lownoisedual amplifier FETs. As a result,no inputcapacitors are necessary.A mere increasein equalizer gain, rather than an additional pre-preampor step-up transformer, is all that is neededfor MC cartridge compatibility.When the amp is in the straightD-C mode,the onlycapacitorin the entireampcircuit, whetherthe inputis MC or MM, is the EQ output capacitor.
RecordingSelector Independent with 2-WayDubbing
youcanrecord Withthisversatile arrangement whilelistening fromonesource to another since the inputandrecording selectors areseparate. Tapeinputsarepositioned on boththeinput selector andthe recording selector sothatyou whilelistening to another can record source (such if youwish. as a disc),
for "Straight DC" Configuration DirectCouplingBetweenDCPower Amp Sectionand High LevelInput Signals
The SU-V6's designtakesfull advantage of the phaseexcellent low-range f requency response, linearity, and low distortioninherentin our refinedDC pourer amp design.By increasing the gain of the power amp section,we have made it possible to directlycouplehighlevelinputs, such as tuner, tape, and AUX sources,to the power in low amp input.The resultingimprovement range fidelity is a good example of what can be achieved with an innovative,yet uncomplicated, approach to integratedamp design. In fact, you couldview this configuration as simplya phono equalizerand a DC poweramp. Whilethis characterizes the "simple is best" philosophy, innovations were some additional necessary to obtain the desired performance goals.Firstof all, a high-gainamp is required to raisetypical "high level" inputsof 150 mV200 mV to outputlevelsof 70 W-100 W. Furthermore,any tendency toward temperature deoendentDC drift must be avoidedsincethe amp's gain extendsallthe way downto DC in the low range. To obtainhighgain,Technics'SU-V6amp employsa linearcascode,3-stageDarlington which provides configuration excellent openloopperformance. As a result, only45 dB NFB is requiredto achievethe 0.007%fHD ratingat 70 Woutput. To combatDC drift, 1-chipdual FET's are used for the first stagedifferential amplifier. Sincethis prevents mutual temperaturedifferences,DC drift is reducedto a mere + 10 mV from - 10'C to
RemoteAction SwitchesEliminate ExcessWiring
Remote action switches are employedon the inputselector,recording selector, and phono selector. Therefore, switchingtakes place at the ideal location withinthe circuitry. This contributes to soundqualityby minimizing the chances of signal degradationdue to extensivewiring.
Other Features
oHigh filterto cut out high frequency noisesuch as record scratches and tape hiss. oFront-panel speaker selector lets you select either of two pairs of speaker systems (A or B) or both at once (A+B). aTone controls defeated at center oosition setting.
+50'c.
ConcentratedPowerBlock (CPB) PreventsDistortion from Electromagnetic Induction
clean high rangeresponse With the strikingly obtained from our New Class A synchro bias circuitry, we made sure that nothingwould interfere with proper performanceunder practical signalhandlingconditions. Our concentratedpower blockwas developedto prevent electromagneticinductionbetween those portions of the circuitrywhich handlelarge amounts of current and those which handle smallersignals.The powersupplyand output stage were concentratedin one integratedunit to
RearPanelFacilities
89
ffi
:: ,:Y
(p'(p (b
17
10
1 . PHONOinputs
11
a .,r) $ xww n wq
ST-S7 and SU-V6 FM/AM StereoTuneris iust the right The ST-S7 Quartz Synthesizer stylingand companionfor your SU-V6.With the sameclean,attractive performance it perfectly complements the SU-V6 standards, outstanding Integrated DC Amplifier.
2 . TUNERinputs
AUX inputs A outputs TAPE DECK I Recording 5 . TAPE DECK 1 Playbackinputs outputs 6 . TAPE DECK2 Recording
7. 8. 9. 10. '1 '1 .
TAPE DECK2 PlaybackinPuts Groundterminal Speakerterminals(main) Speakerterminals(remote) Voltage adjuster
poweroutput 20 Hz-20 kHz continuous 80Wx2 (4()) both channelsdriven 70Wx2 (8cl) poweroutput 40 Hz-1 6 kHz continuous B0Wx2 (4O) both channelsdriven 70Wx2 (80) poweroutput 1 kHz continuous 90Wx2 (4O) both channelsdriven 74Wx2 (8O) Total harmonicdistortion rated oower o.o2%ga) at20 Hz-2O kHz al 40 Hz-16 kqz at 1 kHz
level* ,tP"H3?,Uraaon output Headphones
Load imoedance MAIN or REMOTE MAIN and REMOTE & impedance Inputsensitivity PHONOMM MC TUNER,AUX TAPE 1, REC/PLAY TAPE2 Phonomaximuminputvoltage at 1 kHz. RMS.THD 0.01 % MM MC rated power4() PHONOMM MC AUX TUNER, -26 dB power4ft PHONOMM MC TUNER,AUX 50 mW power4O PHONOMM MC TUNER,AUX 4()-16() 8f)-16() 2 . 5 m V / 4 7k Q 170 p.V/474 150 mV/36 ko 170 mV/39 kO '150mV/36 ko 1 5 0m V 1 0m V
(8o) 0.007% 0.o2%ga) (8o) 0.007% (4o) 0.01% (8o) 0.007%
s/N
half power (8o) at 20 Hz-2O kHz 0.007% (8o) at 1 kHz 0.003% -26 dB power at 1 kHz 0.05%(4()) 50mWpoweratlkHz 0.08%(4o) Intermodulation distortion rated power O.O2% at 250 Hz:8k{z=4:1 ,4Q at60Hz:7 kHz:4:1, SMPTE,8A 0.0O7% both channelsdriven,-3 dB Powerbandwidth THD.0.03%,5 Hz-60 kHz (4o) THD.O.O2%, 5 Hz-60 kHz (8O) Residualhum & noise (StraightDC) 0.3 mV 30 (4O),60 (8O) Dampingfactor
78 dB (86 dB, rHFA) 68 dB (68 dB, rHFA, 250 pV input) 9 2 d B ( 1 0 6d B , I H FA ) 67 dB 65 dB 68 dB 64 dB 62 dB 65 dB
Frequencyresponse RIAA standardcurve +0.5 dB PHONO (30 Hz-l5 kHz) TUNER.AUX.TAPE (Straight DC) DC-150 kHz (-3 dB) +0, -0.3 dB (2OHz-2O kHz) Tone controls 5 0 H z ,+ 1 0 d B - - 1 0 d B BASS 2 0 k H z ,+ 1 0 d 8 - - 1 0 d 8 TREBLE 7 kHz, -6 dBloct High-cutfilter 20 Hz, -12 dB/oct filter Subsonic Loudnesscontrol (volume 50 Hz, +9 dB at -30 dB) Outputvoltage& impedance 1 5 0m V REC OUT 30 mV/82 kO REC/PLAY Channelbalance + 1 . 0d B AUX, 250 Hz-6300 Hz Channelseparation 55 dB AUX,1 kHz GENERAL Power consumption Powersupply 760 W AC 110/120/220/240V, 50/60 Hz WxHxD) mm 430x153x351 D i m e n s i o n(s (16-15/16" x 6-1/32" x 13-1 3/ 16") 12.5kg (27.6lb) Weight by Note: Total harmonicdistortionis measured the digital spectrum analyzel (HP3045system).
Technics
OE2 SD8OFOl Specifications subject to change without notice.
Matsushita Electric
Printed in Japan.
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