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





JVC QL-A2 turntable

JVC Quartz Auto-Return Turntable features:

JVC Quartz technology - Low Wow and Flutter 0,025%

Dependable JVC Super Servo Frequency Generator

JVC Core - Less Direct Drive Motor

Auto-Return Convenience at Attractive Price

 

The QL-A2 delivers the same accuracy and dependability of all JVC Quartz units. In addition to its first-rate specifications of 0,025% wow/flutter (WRMS) and  72 dB Signal-to-Noise Ratio (DIN-B), it has an auto-return mechanism for added convenience. Remember, only JVC's advanced techniques can bring such low-priced perfection to your stereo performance.

 


jVC Quartz Technology

The basic circuit configuration of the QL-A2 is the same as the one used in the QL-F4. an accurate Quartz oscillator, JVC's Super Servo Frequency Generator and "no-cogging" Core-Less DC Servomotor are all included in the QL-A2. moreover, JVC's simplified circuits and advanced production techniques are abundantly used in its production, leading to dramatically improved stability and accuracy.

New One-Row Strobe

With the One-Row Strobe used with the QL-A2, you can visually confirm speed accuracy. Since the LED flashes on and off, synchronized with the frequency of the Quartz, the strobe pattern is always sharp and clean. And since the frequency is changed with the speed, only one row of calibration dots is necessary for communicating the information for both 45 and 33-⅓ rpm.

 

 

Dependable Auto-Return /Shut-Off

As you move the tonearm toward the record, the platter starts to rotate in our "Quick Play Function". When the leadout groove of the record is played, the arm automatically lifts itself up, returns to its rest and shuts the power off in the "Auto-Return/Shut-Off Function". Like the QL-F4, the QL-A2 can be operated as if originally designed for manual operation since its arm may be moved manually anytime. Other features include a Reject Lever that returns the arm during play and a Cue Lever to lift the arm up and down. The tonearm features the Angular Contact Bearing Oil-Damped Cueing, insulated arm/weight interface and more.


Specifications

Drive System:  Direct drive

Motor:  Coreless DC type FG servomotor

Speeds:  33-⅓ and 45 rpm

Wow and Flutter:  less than 0,025% (WRMS)

Rumble:  more than 62 dB (IEC-B);  72 dB (DIN-B)

Speed Detectiona:  Integrated frequency generator

Starting Torque:  more than 650 g-cm

Speed Deviation:  within 0,004%

Load Characyteristics:  0% (with 100 g total tracking force)

Drift per Hour:  0,0001% /h

Power Characteristics:  0% (±10 % V)

Temperature Characteristics:  0,00005% /°C

Platter:  312 mm diameter

Tonearm Type:  Tracking-Hold system, static balanced

Effective Length:  220 mm

Tracking Error:  +3°35' - 0°43'

Overhang:  15 mm

Tracking Force Range:  0 - 3g (0,25 g division, direct reading)

Weight Range (incl. Headshell):  14,5 - 21 g (10 g headshell)

Cartridge Type:  Moving magnet (cartridge body MD-1025)

Stylus:  0,5 mil. Diamond (DT-Z1S)

Optimum Tracking Force:  2 gramm

Output:  3 mV (1 kHz)

Frequency Response:  10 - 25,000 Hz

Separation:  more than 25 dB (1 kHz) with test record TRS-1

Load Resistance:  47 k  - 100 k

Compliance

Dynamic :  10 x 10¯⁶ cm/dyne

Static :  30 x 10¯⁶ cm/dyne

General Specifications

Power Requirements:  AC 110, 120, 220, 240 V 50/60 Hz

Power Consumption:  9 watts

Dimensions (W x H x D):  460 x 147 x 365 mm (with cover closed)

Weight:  6,5 kg (14,3 lbs)

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