Integral Rotor-Platter

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The SL-1710's Integral Rotor-Platter Structure:Only Technics Gives You This Major Advancein Direct Drive Turntables.The direct drive turntable, first developedby Technics, eliminated complicated andinetficient belts and pulleys and establisheda new standard for quality turntables.Technics carries this remarkable advanceone step further with the development ofthe Integral Rotor-Platter structure. Thislatest Technics breakthrough combinesthe turntable platter and the rotor of themotor in one piece, reducing the numberof moving parts to just one to even furthersimplify turntable construction and at thesame time raise oerformance standards.The advantages of this latest Technicsdesign are numerous. Simplifiedconstruction makes more orecise andaccurate speed possible as well as greaterreliability. Simplifie design also makesslimmer, lower, more attractive stylingpossible. And most important, these newdevelopments make for performanceunequaled by other drive systems. Wowand flutter are held to an amazing figureof only 0.025oh WRMS, while rumblemeasured according to the accepted DINB (weighted) method amounts to -73 dB."One-Chip" 321-Element IC for MotorControlservo control circuits, this "one-chip"control system contains a number ofrefinements which assure unvaryingrotational speed free from "lag incorrective response" that sometimescauses short-term speed inrregularitiesin other turntables.B.FG Insures Lag-Free Detection ofRotationalSpeedB.FG stands for "Back ElectromotiveForce Frequency Generator." To monitorthe speed at which the platter is rotatingat any given moment, the reverseelectromotive force induced by the rotorin the stator field coils is utilized. Thewaveform obtained from this backelectromotive force becomes the referencefor the trequency generator. lts output iscomoared with the standard calibrationfrequency obtained from the referenceoscillator and then, when needed, acorrection signal instantly changes themotor drive current in order to maintainprecise rotational velocity. And it doesthis without the time lag conceivable inother systems.In terms of actual performance, theB.FG principle considerably improvesspeed stability, gives a shorter build-uptime, and maintains accurate speed undervarying loads.Strobe LampA built-in strobe lamo illuminatesstroboscope markings on the platter edge.When the line of markings for the selectedspeed seems to stand completely still,the platter is rotating at exactly the rightspeed.Pitch ControlSeparate variable pitch controls for eachspeed permit independent fine adjustmentof pf atter speed within a range of 10o/..Neither adjustment affects the other.To drive and control the direct drivemotor, the SL-1710 employs a "one-chip"lC (integrated circuit) which can performthe functions of uo to 321 elements suchas transistors, diodes, resistors, etc. Withthis lC as its brain, the motor controlcircuit supplies precisely the correctamount of drive current to the motor tomaintain the proper speed under allconditions. Compared with conventional
The SL-171O's Floating Double-lnsulator :A Unique Construction Innovation for ObtainingCrystal-Clear Sound from Your SystemVibration analysis ol floating syslem vsnonJloaling system (wiih dust cover on)Vibration analysis of floating system vsnon-floating system (without dust cover)Technics' Floating Double - Insulator Fights against Acoustic Feedback.As they have done in so many other areasof turntable design, Technics engineershave come up with an ingenious andunique method of coping with the acousticfeedback problem: the floating doubleinsulator.External sounds and vibrationsthat reach the SL-171O-either through theair or through the unit's resting positionaremet by two separate insulatorsconstructed of metal springs and specialvibration-absorbing material. The allimportantturntable, motor and tonearmassembly are mounted on a main basewhich actually lloats on these insulators,and this allows these parts to remainfar removed and isolated lrom harmfulvibrations. We feel confident that thissystem used in the SL-1710 goes furtherthan any other turntable in combating thisdiff iculty.But we haven't stopped here. The SL-1710 was designed from the bottom upwith the prevention of acoustic feedbackin mind. The main base is made heavierwith extra metal weights and the baseitself is lined with visco-elastic materialto help eliminate these unwanted vibrations.In addition, the tonearm base isconstructed of a zinc alloy, whose weightalso fights against sound-distortingacoustic feedback. A newly-designedturntable mat to provide full, gentlerecord support, and a precision-made,die-cast aluminum cabinet are alsofeatures which offer important assists inthe battle against acoustic feedback.Taken together, these measures add upto a considerable accomplishment, onethat can make the difference betweenmediocre and truly exceptional sound.Sensitive Gimbal Suspention TonearmFor the finest tracking sensitivity, thetonearm rests in a gimbal suspensionequipped with two pairs of low frictionpivot bearings. With enhanced rotationalsensitivity, the tonearm is allowed free,gyroscopic movement to ensure flawlessbalance during tracking. The longer thanusual effective tonearm length (230 mm or9*" , stylus to pivot) contributes to thearm's low tracking error, and this in turnfacilitates the design on the anti-skatingcontrol for precise and reliable tracking.With this design, a single precise antiskatingscale counteracts side thrust forall types of styli.
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Integral Rotor-Platter

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