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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





Sony PS-LX4 turntable

The Sony Semi-automatic turntable

PS-LX4 are automatic return turntables with a full array of features and flawlessly smooth performance at modest cost.

 

Outstanding Features

Straight Duralumin tonearm for low mass and excellent tracking

Two-point tonearm support for high rigidity and low modulation noise

Tonearm and Functions

Semi-automatic system returns tonearm at end of play and shuts off motor

Front controls provide convenient operation - even with the dust cover closed

Record-setting guides make it easy to place the record precisely on the spindle

Turntable and Construction

Quartz lock prevents even minute speed variations caused by external factors

The Sony Linear Torque BSL motor designed for uniform and smooth delivery of torque

Magnedisc servo control monitors speed at the outer rim of platter for exceptional accuracy

Electromagnetic braking provides rapid and smooth half of platter rotation

Sony Bulk Molding Compound base is both rigid and acoustically inert to reduce feedback

 


The PS-LX4 direct-drive turntable deliver exceptional performance. Both models incorporate Sony's straight, low-mass tonearm, also found on several other Sony models. It is obvious, that a turntable's tonearm is critical to performance

A tonearm must be rigid. Yet some cartridges only function properly with a low-mass tonearm. These seemingly contradictory requirements - high rigidity and low mass - have been met by the design and materials of the straight, low-mass tonearm. The shaft of this tonearm is supported in two places; behind and in front of the vertical bearings. This two-point suspension reduces resonance and makes the shaft 35% more rigid.

Sony engineers have chosen an alloy called Duralumin which, when fabricated into a thin-walled, hollow tube.=, nevertheless retains exceptional strength. Finally, because of its high rigidity and low mass, the tonearm accepts a wide variety of cartridges, including the high compliance, high performance types.

 

 

Specifications

Turntable

Operation Type:  Semi-automatic

Platter:  310 mm (12-1/4") aluminum-alloy diecast

Platter Weight:  1,1 kg (2lb 7 oz)

Motor:  Linear torque BSL (Brushless and slotless) motor

Drive System:  Direct-drive

Control System:  Magnedisc servo, and Quartz lock control system

Speeds:  33-⅓ and 45 rpm

Starting Characteristics:  Comes to nominal speed within a half revolution (33-⅓ rpm)

Speed Accuracy:  >0,003%

Wow and Flutter:  0,025% (WRMS) ±0,04% (DIN-45507)

FG Direct Measurement:  0,02%

Signal-to-Noise Ratio:  78 dB (DIN-B)

Load Characteristics:  0,05% up to 150 g stylus force (at lead-in groove of a record)

Tonearm

Type:  Straight Statically balanced

Pivot-to-stylus length:  216,5 mm (8-5/8")

Overhang:  16,5 mm

Tracking Error:  +3°00'; -1°00'

Effective Mass (without cartridge):  8,98 g

Stylus Force Adjustment Range:  0 - 3 g

General Section

Power Requirements:  120 V AC 60 Hz

Power Consumption:  8 W

Dimensions (W x H x D):  430 x 105 x 355 mm (17" x 4-1/4" x 14")

Weight:  approx 6,3 kg (13 lbs 14 oz)

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