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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





Nakamichi RX-303 cassette deck

 

Unidirectional Auto Reverse Cassette Deck

A 2-head , Closed-Loop Dual-Capstan record/playback auto reverse deck rivalling the RX-505 in top performance quality.


 

The RX-303 is designed with the same Unidirectional Auto reverse mechanism and high-precision transport employed in the RX-505, for exceptionally high reproduction quality. The RX-303 incorporates a triple laminated core Sendust record/playback head instead, yet provides wide, flat frequency response and extremely low distortion rivalling that of the Discrete Three-Head System. Low-noise, low-distortion amplifiers, the same as those used in the RX-505, ensure the finest possible reproduction performance, and the same Closed-Loop Dual-Capstan Transport silent mechanism guarantees incredibly accurate, stable tape travel characteristics. Extra operating control and convenience is provided with automatic fade-out and fade-in prior to and after the reverse operation, for smooth musical transistors between sides of a tape. A host of other features, combined with the outstanding reproduction quality of the Rx-303, make this deck a strong rival to the RX-505 in all-around performance.

 

 


 

Specifications

Track Configuration:  4-track, 2-channel stereo (Auto-reverse recording and playback)

Heads:  1 x REC/Playback 1 x Erase

Motors

Transport :  1 x PLL servo motor x Capstan, 1 x DC motor x reel drive

Mechanism :  1 x DC motor (cam operation); 1 x DC motor (cassette reversal)

Tape Speed:  1-7/8 ips (4,8 cm/sec) ±0,5%

Wow and Flutter: 

less than ±0,08% WTD peak

Less than 0,04% WTD RMS

Frequency Response:  20 Hz - 20,000 Hz (recording level -20 dB)

Signal-to-Noise Ratio (400 Hz, 3% T.H.D. IHF A-WTD RMS)

Dolby C-Type NR :  Better than 68 dB

Dolby B-Type NR :  Better than 62 dB

Total Harmonic Distortion

Less than 1,0% (400 Hz, 0 dB, ZX, EX II tape)

Less than 1,2 % (400 Hz, 0 dB, SX tape)

Erasure:  better than 60 dB (100 Hz ±10 dB)

Separation:  better than 36 dB (1 kHz, 0 dB)

Crosstalk:  better than 60 dB (1 kHz, 0 dB)

Bias Frequency:  105 kHz

Fast Winding Time:  approx. 60 sec C-60 cassette

Input Sensitivity/Impedance

Line :  50 mV/70 k Ω

Output Level/impedance

Line :  1,0 V (400 Hz, 0 dB output level control at max)/ 2,2 k Ω

Headphones :  12 mW (400 Hz, 0 dB, output level control at max>) / 8 Ω

Power Source:  100,120, 220-240, 50/60 Hz

Power Consumption:  33 W max.

Dimensions (W x H x D):  450 x 144 x 300 mm (17-3/4" x 5-11/16" x 11-13/16")

Weight:  10 kg (22 lb 1 oz)

Nakamichi RX-202 cassette deck

 

Unidirectional Auto Reverse Cassette Deck

RX-202 Auto Reverse record and playback with uncompromising quality. The basic Unidirectional Auto Revers deck.


 

With the RX-202, the revolutionary Unidirectional Auto Reverse mechanism is made available in the most basic deck, for uncompromising reproduction quality due to the elimination of bidirectional azimuth error, plus the outstanding convenience of auto reverse recording and playback. In keeping with the Nakamichi design philosophy, the RX-202 was designed with an emphasis on basic reproduction excellence, offering the finest quality possible with the 2-head, single capstan one-way format. Only Nakamichi can make performance this sophisticated so simple to enjoy.

 


Specifications

Track Configuration:  4-track, 2-channel stereo (Auto-reverse recording and playback)

Heads:  1 x rec/Playback 1 x Erase

Motors (Tape Transport):  DC servo motor x Capstan, DC motor x reel drive

Tape Speed:  1-7/8 ips (4,8 cm/sec) ±0,5%

Wow and Flutter: 

less than ±0,11% WTD peak

Less than 0,06% WTD RMS

Frequency Response:  20 Hz - 20,000 Hz (recording level -20 dB)

Signal-to-Noise Ratio

Dolby C-Type NR on <70 µs, ZX tape>

Better than 68 dB (400 Hz, 3% T.H.D. IHF A-WTD RMS)

Dolby B-Type NR on <70 µs, ZX tape>

Better than 62 dB (400 Hz, 3% T.H.D. IHF A-WTD RMS)

Total Harmonic Distortion

Less than 1,0% (400 Hz, 0 dB, ZX, EX II tape)

Less than 1,2 % (400 Hz, 0 dB, SX tape)

Erasure:  better than 60 dB (100 Hz ±10 dB)

Separation:  better than 36 dB (1 kHz, 0 dB)

Crosstalk:  better than 60 dB (1 kHz, 0 dB)

Bias Frequency:  105 kHz

Fast Winding Time:  approx. 85 sec C-60 cassette

Input Sensitivity/Impedance

Line :  50 mV/30 k Ω

Output Level/impedance

Line :  0,5 V (400 Hz, 0 dB output level control at max)/ 2,2 k Ω

Headphones :  2,2 mW (400 Hz, 0 dB, output level control at max>) / 8 Ω

Power Source:  100,120, 220-240, 50/60 Hz

Power Consumption:  30 W max.

Dimensions (W x H x D):  450 x 136 x 255 mm (17-3/4" x 5-3/8" x 10")

Weight:  9 kg (19 lb 13 oz)

Kenwood KT-1100D tuner

 

High-Quality FM/MW Tuner with 4D System

Features

Pentacle Power Supply System

Improved Direct Linear Reception Circuit (DLRC)

Direct Linear Loop FM Detector (DLLD)

IF Distortion Correcting Circuit (DCC)

New Direct Pure MPX Decoder (DPD)

RF Direct/Distance selectors

Wide/Narrow FM IF band selectors

Recording calibration with modulation meter

Quieting control

16-station randon preset memory with display

Digital-rotary tuning system

Dynamic tuning process display

 


Specifications

FM Tuner Section

Sensitivity (DIN)

Mono (S/N 26 dB, 40 kHz dev.) :  0,9 µV

Stereo (S/N 46 dB, 46 kHz dev.) :  20 µV

Limiting Level -3 dB point, 40 kHz dev>"  0,46 µV

Frequency Response:  20 Hz - 15 kHz ±0,5 dB

Total Harmonic Distortion (1 kHz)

Mono (40 kHz dev.) :  0,02% (Wide); 0,06% (Narrow)

Stereo (46 kHz dev.) :  0,1% (Wide); 0,35% (Narrow)

Signal-to-Noise Ratio  Unweighted

Mono (40 kHz dev. 1 mV input) :  78 dB

Stereo (46 kHz dev. 1 mV input) :  67 dB

Signal-to-Noise Ratio  Weighted

Mono (40 kHz dev. 1 mV input) :  82 dB

Stereo (46 kHz dev. 1 mV input) :  67 dB

Capture Ratio:  2,0 dB (Wide); 3,5 dB (Narrow)

Alternate Channel Selectivity:  64 dB (DIN ±300 kHz)

FM Stereo Separation (1 mV input DIN)

250 Hz :  50 dB  (Wide); 45 dB  (Narrow)

1 kHz :  50 dB  (Wide); 45 dB (Narrow)

6,3 kHz :  40 dB  (Wide); 35 dB (Narrow)

12,5 kHz :  35 dB   (Wide); 30 dB (Narrow)

Alternate Channel Selectivity (±300 kHz DIN):  55 dB (Wide): 80 dB (Narrow)

Image Rejection Ratio :  80 dB

IF Rejection Ratio :  110 dB

Spurious Rejection Ratio :  100 dB

AM Suppression Ratio:  70 dB

Subcarrier Suppression Ratio:

19 kHz, 46 kHz Dev :  55 dB

38 kHz, 46 kHz Dev :  68 dB

MW Tuner Section

Usable Sensitivity:  10 µV (250 µV/m)

Signal-to-Noise Ratio (1 mV input):  52 dB

T.H.D.  0,4% (Wide); 0,6% (Narrow)

Image Rejection Ratio:  40 dB

Selectivity (IHF):  25 dB (Wide); 50 dB (Narrow)

General

Power Consumption:  18 W

Dimensions (W x H x D):  440 x 88 x 331 mm

Weight:  4,6 kg

Kenwood KT-880DL tuner

 

Quartz Synthesized FM/MW/LW Tuner with DLRC

Features

Pentacle Power Supply system

New Direct Linear Reception Circuit (DLRC)

Quartz synthesized tuner with computer controlled tuning system

20-station random preset memory with display

Automatic and manual digital tuning

Wide/Narrow FM IF band selector

Fluorescent dynamic tuning process display

FM auto-muting

 


Specifications

FM Tuner Section

Tunung Frequency Range:  87,5 MHz - 108 MHz

Antenna Impedance:  75 Ω  unbalanced

Usable Sensitivity:  10,8 dBf (0,95 µV)

50 dB Quieting Sensitivity

Mono :  16,2 dBf (1,8 µV)

Stereo :  38,8 dBf (24,0 µV)

Total Harmonic Distortion (1 kHz)

Mono :  0,04%

Stereo :  0,06%

Signal-to-Noise Ratio

Mono :  88 dB (at 65 dBf); 88 dB (at 85 dBf)

Stereo :  76 dB (at 65 dBf); 82 dB (at 85 dBf)

Capture Ratio: 

Wide :  1,0 dB

Narrow ;  2,5 dB

Alternate Channel Selectivity: 

Wide : 60 dB

Narrow :  90 dB

FM Stereo Separation

1 kHz :  55 dB

50 Hz -10  kHz  :  40 dB

Frequency Response 20 Hz - 15 kHz:  ±0,5 dB

Image Rejection Ratio (98 MHz):  82 dB

IF Rejection Ratio (98 MHz):  110 dB

Spurious Rejection Ratio (98 MHz):  105 dB

AM Suppression Ratio:  76 dB

Subcarrier Suppression Ratio: 70 dB

Output Level/Impedance (1 kHz ):  0,6V/3,3 k Ω

MW Tuner Section

Tuning Frequency Range:  530 kHz - 1610 kHz

Usable Sensitivity:  10 µV (350 µV/m)

Signal-to-Noise Ratio:  52 dB

T.H.D.  0,3%

Image Rejection Ratio:  40 dB

Selectivity (IHF):  25 dB

Output Level/Impedance (400 Hz 30% Dev):  0,18V/3,3 k Ω

LW Tuner Section

Tuning Frequency Range:  153 kHz - 281 kHz (1 kHz step)

Usable Sensitivity:  17 µV (800 µV/m)

Signal-to-Noise Ratio (30% Mod; 1 mV input):  50 dB

Total Harmonic Distortion:  0,5%

Image Rejection Ratio:  35 dB

Selectivity(IHF):  30 dB

Output Level/Impedance (400 Hz, 30% mod):  0,18V/3,3 k Ω

General

Power Consumption:  13 W

Dimensions (W x H x D):  440 x 78 x 317 mm (17-5/16" x 3-1/16" x 12-1/4")

Weight:  3,5 kg (7,8 lb)

Kenwood KT-660L tuner


Quartz Synthesized FM/MW/LW Tuner with Timer

Features:

Station Name Preset System (SNPS)

20-station random preset memory

12-station preset with SNPS system

Fluorescent display

Presect scan

Automatic and manual digital tuning

Buil-in two programme timer and 60-minute sleep timer.

 


Specifications

FM Tuner Section

Tunung Frequency Range:  87,5 MHz - 108 MHz

Antenna Impedance:  75 Ω  unbalanced

Sensitivity (DIN)

Mono :  1,0 µV

Stereo :  29 µV

Limiting Level -3 dB point, 40 kHz Dev:  0,5 µV

Total Harmonic Distortion

Mono :  0,15%

Stereo :  0,2%

Signal-to-Noise Ratio (DIN) Unweighted

Mono :  68 dB

Stereo :  64 dB

Signal-to-Noise Ratio (DIN) Weighted

Mono :  68 dB

Stereo :  63 dB

Capture Ratio:  1,8 dB

Alternate Channel Selectivity:  64 dB (DIN ±300 kHz)

FM Stereo Separation (1 mV input DIN)

1,000 Hz :  50 dB

6,300 :  36 dB

Frequency Response 30 Hz - 15 kHz:  +0,5 dB -2,5 dB

Image Rejection Ratio (98 MHz):  75 dB

IF Rejection Ratio (98 MHz):  95 dB

Spurious Rejection Ratio (98 MHz):  100 dB

AM Suppression Ratio:  70 dB

Subcarrier Suppression Ratio:

19 kHz, 46 kHz Dev :  70 dB

38 kHz, 46 kHz Dev :  75 dB

Output Level/Impedance:(1,000 Hz 100% Dev):  0,6V/3,3 k Ω

MW Tuner Section

Tuning Frequency Range:  531 kHz - 1602 kHz

Usable Sensitivity:  14 µV (400 µV/m)

Signal-to-Noise Ratio (30% Mod, 1 mV input):  50 dB

T.H.D.  0,5%

Image Rejection Ratio:  40 dB

Selectivity (IHF):  25 dB

Output Level/Impedance (400 Hz 30% Dev):  0,18V/3,3 k Ω

LW Tuner Section

Tuning Frequency Range:  153 kHz - 281 kHz (1 kHz step)

Usable Sensitivity:  17 µV (800 µV/m)

Signal-to-Noise Ratio (30% Mod; 1 mV input):  50 dB

Total Harmonic Distortion:  0,5%

Image Rejection Ratio:  35 dB

Selectivity(IHF):  30 dB

Output Level/Impedance (400 Hz, 30% mod):  0,18V/3,3 k Ω

General

Power Consumption:  12 W

Dimensions (W x H x D):  440 x 65 x 251 mm (17-5/16" x 2-9/16" x 9-7/8")

Weight:  3,1 kg

Kenwood DP-990SG CD player

 

CD player with Digital Output

Features:

Coaxial digital output

Twin linear full-bit DACs (L/R ch) with Digital Pulse Axis Control

4-times oversampling digital filter

Totally separate digital/analogue circuits and power supplies with twin transformers

Multi-insulation system with Dyna-Pneumatic Suspension

Optimum Servo Control type III

3-beam laser pick-up

High-rigidity structure with diecast pick-up frame

Full-function infra-red remote control

Rapid direct play system with +10 -+50 keys and 10-key input

4-play mode: Track, program, Time, Single

Compu-Time Edit function

5-mode real-time display

20-track random program memory

A-B section repeat

Index search

T.H.D. :  0,0015%

Dynamic Range:  96 dB

 


Specifications

Pick Up Type:  Optical

Lasser Type:  semiconductor

Signal Quantixation:  16-bit linear

Conversion Rate:  88,2 kHz (2 x oversampling)

Sampling Frequency:  44,1 kHz

Channel Modulation Code:  EFM (Eigh to Fourteen Moudiation)

Number of channel:  two

Frequency Response:  2 Hz - 20 kHz ±0,3 dB

Total Harmonic Distortion: 0,0015%

Channel Separation:  105 dB

Dynamic Range:  96 dB

Wow and Flutter: under unmeasurable linit

Line Output Level/Impedance:  2,0 V/110 Ω

Headphone Output Level/Impedance:  25 mW/32 Ω

Power Requirements:  220 V, 50/60 Hz

Power Consumption:  23 W

Dimensions (W x H x D):  440 x 105 x 313 mm

Weight:  5,9 kg

Kenwood DP-660SG CD player

 

CD player with Remote Control

Features:

3-beam laser pick-up

Double oversampling digital filter

10-key input for direct track ccess

20-track random programme memory

Full-function infra-red remote control

Manual search

Track skip

Fluorescent display

Music Calendar programme display

Total/track playing time display

Track and programme number display

T.H.D. :  0,007%

Dynamic Range:  92 dB

 


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 Ω  to 100 k Ω

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 Ω  to 100 k Ω

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)


 

Pioneer Elite PD-75 CD player

How a concept called the stable platter turned the CD upside down.

 

In airline pilots, brain surgeone, and CD players, steadiness is a pretty fundamental requirement. In the case of our newest CD player, the Elite PD-75, its rock-solid stability has rocked the world of music lovers and audio critics. As the reviews have rolled in and the awards have been bestowed, it is apparent that the standard for CD players has been advanced dramatically. Behind this success lies a principle that Elite has brilliantly exploited. The mechanical elements of a CD player are just as critical to its quality as its electronic components.

The first significant innovation to come out of this insight is at the heart of the PD-75. the stable platter.

Two basics of physics - mass and inertia - combine to make the stable platter an obviously superior platform to support a disc spinning at high velocity.

Next, the stable platter, by supporting the entire area of the CD disc, minimizes wobble and chatter.

A wobbling disc presents a difficult target for the laser, while a chattering disc creates resonance, distorting the signal, which distorts the sound.

Another problem for CDs is gravity. Spinning above the laser pickup and supported only in the center, the disc sags microscopically. Which to a laser beam is significant degradation.

But on the Elite CD platter, the disc is turned upside down - that is, label down, information side up. The disc lies firmly clamped to a solid surface. Meanwhile, the laser pickup reads the disc's digital code from above, where it is immune to dust settling on the laser optics.

 


Specifications

Type: Compact disc digital audio system

Channels:  2-channels Stereo

Frequency Response:  2 Hz - 20,000 Hz

Signal-to-Noise Ratio:  112 dB or more (EIAJ)

Dynamic Range:  98 dB or more (EIAJ)

Channel Separation:  108 dB or more (EIAJ)

Total Harmonic Distortion :  0,0018% or less (EIAJ)

Output Voltage:  2,0 V

Wow and Flutter:  limit of measurement (±0,001% W Peak) or less (EIAJ)

Balanced Type Audio Line Out:  2 V (600 Ω )

Power Requirements:  AC 110/120V; AC 220 - 230 V, 50/60 Hz

Power Consumption:  30 W

Dimensions (W x H x D):  459 x 330 x 130 mm (18-1/16" x 13" x 5-2/16")

Weight:  12,0 kg (26 lb 7 oz)