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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





Sansui SR-535 turntable

Automatic Direct-Drive Turntable

Sansui wants everyone to enjoy hi-fi music with the minimum possible noise, distortion and inconvenience. That's why the Sansui SR-535 automatic direct-drive turntable puts the emphasis on pure hi-fi performance and true handling ease. Accuracy of platter rotation, and a strong, anti-howl construction characteristics in the musical department. The direct-drive motor is a high-torque type and the special tonearm has a unique support to ensure delicate performance. Record reproduction is always clean and pure.

One simple control, the Auto/Manual Play Lever, does all the work. Put a record on the platter, set the record-size selector and pull the lever once; the tonearm is lifted, moved and gently lowered to the lead-in groove, when the record ends, the arm is returned to its rest and power shuts off automatically. The same lever permits manual play when desired. More convenience is offered in the Repeat facility permitting you to select one to five replays, or infinite replay.

 

Automatic Operation

One control knob does it all. The jumbo-sized Auto/Manual Play Lever has three positions of Manual On, Off, Auto Start/Stop. For a single automatic play, you simply place a record on the platter and gently pull the Auto/Manual lever into the Auto Start/Stop position. The tonearm lifts automatically as the platter begins to spin, the stylus is placed over the lead-in groove of the record, and the tonearm descends to begin play. If you desire to interrupt play at any time, simply pull the lever again, or you may wait till the record ends. In either case, the arm is automatically lifted  and returned to its rest, and power is switched off, all without your assistance.

When manual play is desired, simply set the control lever to the Manual On position. When the platter begins to rotate, move the stylus to over the part of the record you want to hear. An oil-damped Cueing Lever is provided to help you avoid damaging your valuable records. As in Auto Play, the Manual position on the lever allows the automatic return mechanism to return the tonearm to its rest.

Additional convenience Auto Repeat control on the SR-535.

In the Off position if sets the turntable in auto-return mode. Or, you can select from "1" to "5" repeat plays, or "infinite" which allows the automatic mechanism to continuously repeat its simple job until you change the repeat control settings.

 


Accurate Drive System

Sansui engineers have done if again. The platter of the Sr-535 never shows any appreciable slow-down under reasonable loads. This means that your 33-⅓ and 45 rpm records are always played at the correct speeds for best musical performance. This accuracy is assured by an advanced, high-torque, 20-pole/30-slot brushless DC type servo motor for direct drive. Speed drift is effectively eliminated by the Sansui-exclusive rotor position sensor mechanism, coupled with the motor's bias-controlled saturable core (Sansui Pat. Pend). Thanks to the dependable power supply, the drive voltage is kept constant for accuracy under any conditions.

Mechanically, as well as electrically, the SR-535 has impressive precision. All components and parts are designed, machined and assembled under very careful super-vision to live up to Sansui's strict quality control standards. The bearing sleeve is mirror finished for complete roundness, for instance. The motor shaft/center spindle is formed of the finest polished carbon-chrome steel and rides in a thrust bearing of tough friction-resisting synthetic polyamide. We've used a special lubricant, one developed by the aerospace industry, to ensure low friction in the motor over long years of operation.

Smoother rotation is also ensured by the heavy (1,4 kg ) aluminum die-cast platter. This, plus Sansui's attention to every minor point in design and construction, gives the Sr-535 impressive specifications low 0,038% wo/flutter and better than 67 dB rumble.

Fine speed adjustment with strobe

On the edge of the oversized (31,8 cm or just over 12-inch) platter there are four rows of stroboscopic patterns, two each for both speeds to permit fine adjustment when your electrical power is either 50 Hz or 60 Hz. The strobe light illuminates the platter edge so that you can visually check its rotation speed for accuracy. Once the correct speed is reached, the speeds will continue to spin accurately, or you can use two fine speed controls to vary platter by as much as ±3,5% from the standard speeds. By the way, these controls are recessed to avoid accidental speed change.

 


Stabilized Tonearm

Exceptionally high tonearm stability is one of the reasons the Sansui Sr-535 performs with such high musicality. Despite the attractive price of this fully automatic turntable, the tonearm has the same stability and resistance to resonance found in much more expensive models. Spurious vertical travel and harmful torsion or twisting are avoided by a special support with two vertical pivots. The mass of the arm is concentrated at these points to clearly define the unit's fulcrum for better mechanical advantages, particularly in the bass frequencies which are delivered from your record free of "mud".

Low-resonance design

Resonance is further suppressed by the special acoustic absorbent, we use inside the highly rigid tonearm tubing. Then, we've decoupled the balance weight from the arm shaft vis a newly designed rubber damper. All types of vibration whether  transmitted through the air or through the physical structure, are shut out before reach the stylus.

Other tonearm features:

Zinc-alloy die-cast arm base; a massive heavy structure to improve bass response by firmly securing the arm to the cabinet.

Direct readout tracking force dial; precision-calibrated markings every 0,25grams one rotation covers 0-to-3 gram range

Gold-plated connection pins; free from all forms of rust to ensure maximum transfer of the tiny electrical signals from cartridge to your amplifier

Arm lifter lever; oil damped for smooth operation

Anti-skate knob; adjustable even as the record is played, another bonus in this attractively priced turntable.

 

Cabinet

Sansui designers take special pride in the clean, modernistic looks of the SR-535 turntable. The silver metallic finish sets off the precision lines of the cabinet and is just "flat" enough to resist glare from room lights without appearing too dull. The clean lines are more than good looking, advanced computer technology and time-tested carpentry techniques alike were used in designing the Sr-535 to resist acoustic feedback or "howling". The automatic mechanism is mounted on a separate chassis inside the cabinet for instance while the low-profile of the base and its complex suspension system further ensure good sound.

Complex-suspension

To defeat all types of vibration before they can harm your music, the SR-535 is suspended in a complex system of rubber and spring devices. Air-borne vibration, such as sound-waves from your speakers, and structure-borne vibrations, such as originating from your operation of amplifier or receiver controls, from footsteps, etc. Are effectively damped so that your music retains its tight bass, clean mids and crisp highs.

 


Specifications

Type:  two-speed, direct-drive automatic turntable

Motor:  20-pole, 30-slot DC brushless

Drive System:  Direct spindle drive electronically servo controlled

Platter:  318 mm aluminum alloy die-cast

Platter Weight:  1,4 kg (3,1 lbs)

Wow and Flutter:  less than 0,038% WRMS

Signal-to-Noise Ratio (IEC-B) :  better than 57 dB

Rumble (DIN-B) :  better than -67 dB

Speeds:  33-⅓ and 45 rpm

Fine Speed Adjustment:  ±3,5%

Tonearm:  Statically-balanced S-shaped tonearm with two-point pivot support

Length:  220 mm pivot to stylus tip

Overhang:  17,5 mm

Offset Angle:  24,5°

Minimum Tracking Force Setting:  0,8g (when using cartridge guaranteed to operate at 0,8g stylus pressure)

Acceptable Cartridge Weight:  4 to 10 g

Cabinetry: Slim line cabinet with anti-howling insulators and hinged free-stop dust cover

Cartridge:  Sc-50

Type :  Intermodulation Distortion type

Frequency Response:  10 to 20,000 Hz

Output Voltage:  3 mV per channel (1,000 Hz , 35,4 mm/sec)

Optimum Load:  47 k Ω

Tracking Force:  2,5 g ±0,4 g

Stylus:  0,6 mil diamond spherical (SN-50)

Power Requirements:  100, 120, 220, 240 V, 50/60 Hz

Power Consumption:  less than 9 watts

Dimensions (W x H x D):  460 x 166 x 370 mm (18-1/8" x 6-3/16" x 14-9/16")

Weight:  9,2 kg (23,6 lbs) packed