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 XL-V182 CD player

Compact Disc Player

Features:

1-bit P.E.M. D.D. Converter with Vans and fine pulse interface

8-times oversampling digital filter

DDRP (Dynamics Detection Recording Processor)

Smart random play

10 -key pad for direct track access

2-way edit function auto and programmed

Center-tray mechanism

15-track program chart

Program play of up to 32 tracks

4-way repeat; all tracks, single track, programmed tracks and random play

Auto/manual search

Enhanced Compu Link Control System

 


Specifications

System:  Compact disc player

Signal Detection:  Non-contact optical

Numbers of Channels:  2 channels

Frequency Response:  2 Hz - 20 kHz

Dynamic Range:  98 dB (1 kHz)

Signal-to-Noise Ratio:  106 dB (at digital 0)

Channel Separation:  94 dB (1 kHz)

Harmonic Distortion:  0,0025% (1 kHz)

Wow and Flutter:  lass than measurable limit

Output Level:  1,0 V RMS (full scale)

Number of Program Steps:  32 steps

Dimensions (W x H x D):  435 x 103 x 274 mm (17-3/16" x 4-1/16" x 10-13/16")

Weight:  3,3 kg (7,3 lbs)



 

JVC L-F71 turntable

Electro-Servo Fully Automatic Direct-Drive Turntable with Music Scan

 

Superb tracking and utmost operating convenience are happily and harmoniously combined in the L-F71 from JVC. E-D Servo damps arm resonance for better tracking, while applying anti-skating force accurately anywhere across the record surface. And for convenience, the JVC "Music Scan"  system automatically homes in on whatever track you've selected, there's nevere a need to touch the tonearm. Conveniences such as these weren't even thought possible just a few short years ago.

E-D Servo for horizontal arm movement; Damped resonance and accurate anti-skating.

By designing a straight, low-mass tonearm for the L-F71, we succeeded in damping arm resonance and subduing shock caused acoustic feedback. But we've made it still better by controlling its horizontal movement with JVC's exclusive E-D Servo. The L-F71 is totally and effectively protected against mistracking, coloration, poor bass response and poor stereo separation that can be caused by resonance.

 

JVC "Music Scan" for random cueing

Say you want to hear the third band on a record. Just push the Track button three times and then Start/Stop - the tonearm will automatically scoot over and set down exactly at the beginning of the third band and play through to the end of the record. Our special headshell houses an optical system that scans the record surface. An LED digital indicator tells you the number of the track being played at any given moment.

 


Computerized fully automatic operation via front-panel touch buttons.

Touch any of the operating buttons and the programmed to order microcomputer supervises the order of events flawlessly. Since the L-F71 is fully automatic, you need not touch the tonearm at any time. Up-front buttons are touch sensitive and may be operated even with the dust cover closed.

 

Smooth coreless DC servo motor and FG Super Servo

Our exclusive cog-free coreless DC servo motor and FG Super Servo speed control account for the superb performance of the L-F71.

 


Specifications

Type:  Direct drive system

Operation Mode:  Fully-automatic Music Scan

Motor:  Coreless DC servo motor

Speed Detection System:  Integrated FG

Speeds: 33-⅓ and 45 rpm

Speed Change: Electronic Switching

Wow and Flutter:  0,03% (WRMS)

Signal-to-Noise Ratio:  75 dB (DIN-B)

Platter Type:  Die-cast aluminium

Diameter:  295 mm

Tonearm Type:  Statically balanced electronic servo controlled arm

Effective Length:  220 mm

Tracking Error:   +3°35' - 0°43'

Overhang:  15 mm

Tracking Force Range:  0 - 3g

Power Requirements:  110, 112, 120, 220, 230, 240 V 50/60 Hz

Dimensions (W x H x D):  420 x 115 x 355 mm (16-1/2" x 4-1/2" x 14-25/32")

Weight Net:  6 kg (13,2 lbs)

JVC QL-F61 turntable

Quartz Locked Fully-Automatic Direct-Drive Turntable.

Advanced Tonearm Design to Complement Quartz Drive System

The QL-F61 is more than just sleek, slim and solid; it's jampacked with futuristic JVC technology. One example is the advanced Double Servo Quartz control to adjust platter speed with unerring accuracy. Another is the coreless DC motor that the servo control operates; iy's brushless, coreless and cog-free. The arm is of the low-mass straight line type for better tracking. For convenience's sake, the turntable is full automatic from cue-in to end of play and shut-off.

 

Smooth platter rotation is assured by the JVC-made coreless DC motor and Double Servo Quartz control

Our ideally matched motor and servo system achieve unimaginably low wow and flutter of 0,025% (WRMS). Signal-to-Noise Ratio is better than 75 dB (DIN-B). Never again will varying pitch, however infinitesimal, mat your musical reproduction, even if the record is of the latest direct-to-disc or digital variety.

 

Low-mass straight tonearm for lighter, better tracking.

The conventional high mass tonearm cartridge combination can produce harmonic distortion on the order of 10% when tracking even a barely visible record warp. But the tonearm of the QL-F61 reduces distortion to practically nil even on moderate wsarps because of its low-mass design. Low mass means a higher resonance frequency (slightly above the warp frequency), a reduced resonance peak, and higher sensitivity. The straight contour of the arm ends spurious movement of the arm due to dynamic torsion.

 

Up-front controls for your convenience

Gone is the cluttered lok that keps you away from the controls when the dust cover is closed. Along the front edge of the QL-F61 are all the operation buttons - "touch" buttons - for record speed, pitch control, quartz on/off, repeat, record size, start/stop and  even arm cueing.

Fully automatic operation with repeat.

Operation is completely automatic from beginning of play to end; there's never any need to touch the tonearm. This is a definite plus when there are kids around who may not be particularly adept at handling the tonearm. Records and stylus are protected. When you're in the mood, switch on the repeat function and listen to the entire side of a record over and over.

 


Specifications

Type:  Quartz Locked Fully Automatic Turntable

Drive Motor:  Coreless DC servomotor

Speeds :  33-⅓ and 45 rpm

Wow And Flutter:  less than 0,025% (WRMS): 0,045 9din0

Signal-to-Noise Ratio More than 75 dB (DIN-B)

Speed Adjustment  Range:  more than ±6%

Platter:  Die-cast aluminium alloy

Diameter:  295 mm (11-5/8")

Tonearm:

Type:  Statically balanced straight tubular arm with JVC developed Tracking Hold balancing system and tracking force dial in 0,1 gram steps

Effective Arm Length:  220 mm

Tracking Error:  +3°35' - 0°43'

Overhang:  15 mm

Tracking Force Range:  0 - 3g

Weight Range:  8,5 - 12 g

Cartridge

Model:  Z-1S

Type:  Moving magnet

Stylus Tip:  0,6 mil. Diamond

Optimum Tracking Force:  1,75 x 0,25 grams (DT-Z1S)

Output:  3 mV (1 kHz)

Frequency Response:  10 to 25,000 Hz

Separation:  better than 25 dB (1 kHz)

Load Resistance:  47 k   to 100 k

Compliance:  30 x 10¯⁶ cm/dyne (Static); 10 x 10¯⁶ cm/dyne (Dynamic)

Power Requirements:  110, 112, 120, 220, 230, 240 V 50/60 Hz

Power Consumption: 

Dimensions (W x H x D):  420 x 115 x 355 mm (16-1/2" x 4-1/2" x 14-25/32")

Weight Net:  5,5 kg (12,1 lbs)

JVC QL-A51 turntable

Quartz-Locked Auto-Return Direct-Drive Turntable

The QL-A51 from JVC differs from the more expensive QL-F61 in only two ways; lack of both a repeat function and full automation. Otherwise it's the spittin image of the QL-F61, including the precision motor , straight tonearm and up-front controls. From the tip of its cabinet base, it's one of our most attractive models - and musical reproduction will be just as attractive resonance and mistracking have become problems of the past.

Our direct-drive Double-Servo Quartz motor has no core.

Double-Servo Quartz control - a JVC exclusive - keeps a constant check on the actual platter speed, speeding up or slowing down the motor instantly if any speed error is detected. Moreover, the servo motor is of our own design, made by us, and coreless to avoid cogging, the annoying rotational fluttering which can spoil music reproduction. Long-term accuracy and reliability are assured throughout this sophisticated direct-drive turntable.

 

Rigid, non-resonant straight-line tonearm.

Our tonearm is of the straight-line design for a reason. The reason is to better handle record warps and for clean low-frequency response which is even more important now that digital and direct0cut records are available. Vy being low mass, our tonearm keeps its resonance frequency above the warp frequency and the resonant peak itself is suppressed so that the lowest musical signals can be reproduced without a trace of muddiness. Mechanical strength is another important feature for surer tracking and better resistance to damage.

 

Up-front controls for all operations, including arm cueing.

Taking a design tip from the more expensive and elaborate turntables in our lineup, we've given the QL-A51 still more appeal with a system of simplified, up-front controls. All can be used with the dust cover closed. And unlike other models in this price range, even the cueing control is up-front. Every care has been taken to prevent unnecessary record handling - from the manual cue control to the automatic arm lift, return and power shutoff at the end of play.

 


Specifications

Turntable

Type:  Quartz locked auto-return system

Drive Motor:  DC Servomotor

Speeds: 33-⅓ and 45 rpm

Wow and Flutter:  less than 0,025% (WRMS), 0,04% (DIN)

Signal-to-Noise Ratio :  more than 75 dB (DIN-B)

Speed Adjustment Range:  ±6%

Platter:  Die-cast aluminum alloy

Diameter:  295 mm (11-3/5")

Cartridge

Model:  Z-1S

Type:  Moving magnet

Stylus Tip:  0,6 mil. Diamond

Optimum Tracking Force:  1,75 x 0,25 grams (DT-Z1S)

Output:  3 mV (1 kHz)

Frequency Response:  10 to 25,000 Hz

Separation:  better than 25 dB (1 kHz)

Load Resistance:  47 k  to 100 k

Compliance:  30 x 10¯⁶ cm/dyne (Static); 10 x 10¯⁶ cm/dyne (Dynamic)

Tonearm

Type:  Statically balanced straight tubular arm with JVC developed Tracking Hold balancing system and tracking force dial in 0,1 gram steps

Effective Arm Length:  220 mm

Overhang:  15 mm

Applicable Cartridge Weight:  8,5 to 12 grams including headshell

Power Requirements:  110, 112, 120, 220, 230, 240 V 50/60 Hz

Power Consumption: 

Dimensions (W x H x D):  420 x 115 x 355 mm (16-1/2" x 4-1/2" x 14-25/32")

Weight Net:  5,3 kg (11,7lbs)