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





A&R Cambridge C200 Pre-Amp


A good sound system is more than just a set of highly impressive technical specifications, the listening quality itself is more important than a list of figures. With our 200 series audio equipment we believe we have achieved an extraordinarily good balance between performance and cost, between theoretical design and practical audio quality.
The 200 series combines the very best sound performance with superb standards of construction and a highly attractive modern appearance.
The combined system produces a notably clean and beautifully neutral sound and yet preserves a large number of undeniably useful features.
A unique mixture of careful kistening tests and quality control measures during development and production have combined to present a superbly felxible high performance sound system.

The C200 Stereo Control Unit
The C200 satisfies all the demanding criteria set by systems requiring a control unit of top quality yet with versatility and flexibility in its
Readily upgraded at some later date to keep pace with future developments in audio systems.
The C200 includes a number of useful features not always found on modern high quality pre-amplifiers.
The unit is provided with a variety of tone and signal routing controls without loss of quality in performance. The bass and treble controls are factory set for a perfectly flat response in the 12 o'colock position; soft clicks of the knobs provide a guide for nominal one decibel steps up to a maximum of five decibels boost or cut. The tone controls are non-inverting, which allows a true by-pass cancel switch to be used without phase reversal.

A switchable low frequency, sub-sonic filter is fitted to minimise the effects of possible turntable rumble; it also helps to protect small loudspeakers from low frequency overload. A mono switch is also included.
The headphone socket is driven from a separate internal high quality amplifier. Thus, whatever the final speaker system might be, headphones can always be used. The main pre-amplifier outputs are automatically muted when the headphones are plugged in . Two extra switched and fused mains outlets to IEC standards, invaluable when connecting up a complete hi-fi system, are provided at the rear of the case.

There is a choice of module cards for the two modular inputs, including low output moving coil cartridge, moving magnet cartridge and line level. The cartridge input boards have switchable load and gain facilities, access to which is through apertures underneath the unit.
A tuner input and two tape inputs are also fitted. Full tape-to-tape dubbing is possible and adjustment is provided for the tape return levels.
Within the C200, provision has been made on the output card for fitting electronic cross-over units for use with active loudspeakers. One such system, using a C200 and two SA200 power amplifiers is shown on page SA200
The C200 Control Unit is primarily intended for use with the SA 200 Power Amplifier, nevertheless it is suitable for pairing with any other high performance power amplifier if required. Also, matching it with units of the A60 series can provide a number of different, highly imaginative sound systems.

Specifications:
Inputs:
Inputs 1 and 2 : labelled Disc and Aux, are programmable and their function depends on the input boards selected.
Moving Coil Cartridge
Input Resistance (switchable):  330/100/30/10 Ω
Input Capacitance (switchable):  1/100 nF
Input Sensitivity (switchable):  60/160 µV at 1 kHz
Noise:  less than -60 dB (high Gain); less than -66 dB (low gain)
Overload Margin:  better than 38 dB
Moving Magnet Cartridge
Input Resistance (switchable):  47/30/8 kΩ
Input Capacitance (switchable):  50/150/270/370 pF
Input Sensitivity (switchable):  1,5 / 3,0 mV at 1 kHz
Noise:  less than -70 dB (high Gain); less than -75 dB (low gain)
Overload Margin:  better than 38 dB
Other Inputs - Tuner, Tape 1 and Tape 2
Input Sensitivty:  100 mV
Input Impedance:
Tuner, Aux :  20 k Ω
Tape 1 and 2 :  10 k Ω
Outputs
Tape 1 and Tape 2
Nominal Output Level :  100 mV
Output Impedance :  2 k Ω
Main Output
Nominal Output Level :  1,0 V
Output Impedance :  350 k Ω
Noise (using line input):  less than -90 dB
Crosstalk (any input):  less than -60 dB at 1 kHz
Distrotion:  less than 0,01% (20 Hz -20 kHz at 1,0 V RMS)
Maximum Output:  better than 8 V RMS
Performance
Frequency Response
Via Line Inputs:  +0, -0,5 dB, (20 Hz -20 kHz)
Via Disc Inputs:  +0,25, -0,5 dB , (20 Hz -20 kHz)
High Pass Filter:  -3 dB at 30 Hz  12db/oct
Tone Controls:  ±5db at 20 Hz and 20 kHz
Phase
All stages are non-inverting providing phase integrity under all operating conditions
Power Supply
200 - 250 V AC, 48 - 63 Hz, 25V A max. The unit may be adjusted to work in the range 100 - 125 V AC.
Maximum capacity of switched AC outlets 5A RMS
Dimensions (W x H x D):  430 x 44 x 305 mm (17" x 1-3/4" x 12")
Weight:  4 kg (6,8 lbs)


A&R Cambridge SA200 Power Amp


The SA200 is a high performance stereo power amplifier that will satisfy the most demanding listening tests and measurements.
Internally the SA200 consists of two identical mono power amplifiers, each with its own separate DC power supply fed from separate secondary windings of the massive toroidal mains transformer. This design approach ensures the very best isolation between the two stereo channels without the extra weight and expense of using a second transformer.
Each amplifier channel can deliver in excess of 100 watts continuous power into 8 Ω  loads or  160 watts into 4 Ω  loads with negligible distortion. The unit will also drive well over 200 watts into 2 Ω . 

Considerable care has been taken to ensure that power output is maintained into low impedance and reactive loads. The amplifier is thus extremely tolerant of different loudspeaker loads. A bridging module is available to connect the two channels to produce over 320 watts into a single 8 Ω  speaker.
The unit is very well protected by quick acting electronic protection systems and fuses. The fuses are placed inside the feedback loops to eliminate their effect on the quality of the sound output. The sound quality is further maintained by the direct hevy duty wiring between the boards and the output terminals. A novel feature of the SA200 is the input-output comparator which detects any amplifier distortion such as clipping. It then momentarily changes the colour of the front panel indicator from green to red as a warning to the user.

The SA200 is built to the highest standards with the minimum of internal wiring. The electronics are housed inn a heavy duty steel tray which also forms the base of the casing. The front panel is made from a custom aluminium extrusion and the rear panel is a single  massive casting which also acts as the heat sink for the output stages. The steel top plate slides into place and is therefore easily removed for quick access to the electronics and the loudspeaker fuses.
The solid wood and cheeks can be supplied in a larger size for stacking the SA200 with a C200 control unit. A rack mouting kit for professional use is also available.
The SA200 is ideally partnered by the C200 Control Unit although it is, of course, suitable for use with any other high quality audio pre-amplifier to form the heart of a system giving the very best performance.

Specifications
Inputs:
Sensitivity:  1,0 V (reference 100W/8 Ω  at 1 kHz)
Input Impedance:  20 k Ω
Noise (unweighted or CCIR/ARMweighted reference 100W/8 Ω ):  less than -100 dB
Gain to Loudspeaker Terminals (29,0 dB at 1 kHz):  phase non-inverting
Outputs
Loudspeakers : 4 - 16 Ω
Nominal Output level:  100 watts into 8 Ω
Performance
Power Output an Distortion
Both Channels into 8 Ω :  100 W at 0,08% Total Harmonic Distortion 20 Hz -20 kHz
Distortion
at any level up to 100 W into 8 Ω , 1 kHz less 0,03% (typically 0,01%)
at any level up to 160 W into 4 Ω  , 1 kHz less than 0,05% (typically 0,02%)
Output Power at 1 kHz at clipping (0,1% Total Harmonic Distortion ) with both channels driven is typically 125 W per channel into 8 Ω  , 195 W per channel into 4 Ω
Frequency Response:
10 Hz - 20 kHz +0, -0,5 dB (It is recommended that the pre-amplifier's high frequency response be curtailed to at least -3 dB at 50 kHz
Power Supply:  240 V AC, 48-63 Hz, 600 VA maxcimum (the unit may be adjusted to work at 220 V or 120 V if required)
Dimensions (W x H x D):  464 x 95 x 350 mm (18-1/4" x 3-3/4" x 13-3/4")
Weight:  10,0 kg (22 lb)


JVC R-S55L receiver



Specifications
FM Tuner Section
Tuning Range:  87,6 MHz - 108 MHz
Usable Sensitivity (IHF):  12,2 dBf (1,1 µV/ 75 Ω)
50 dB Quieting Sensitivity:
Mono :  15,9 dBf 91,7 µV/75 Ω)
Stereo :  38,2 dBf 922 µV/75 Ω)
Distortion
Mono :  0,15%
Stereo :  0,30%
Signal-to-Noise ratio:
Mono :  78 dB ( A-Net weighted (72 dB DIN)
Stereo :  68 dB A-Net weighted (63 dB DIN)
Selectivity:  65 dB ±400 kHz (45 dB ±300 kHz, DIN)
Capture ratio:  1,0 dB
IF Rejection:  90 dB at 98 MHz
Image Rejection:  55 dB  at 98 MHz
Stereo Separation:  45 dB at 1 kHz
MW Tuner Section
Tuning Range:  525 kHz - 1605 kHz
Usable Sensitivity:  300 µV/m, 50 µV/m (external antenna)
Signal-to-Noise Ratio:  45 dB
Distortion:  0,5%
Selectivity:  46 dB ±9 kHz
LW Tuner Section (DIN)
Tuning Range:  150 kHz - 350 kHz
Usable Sensitivity:  40 µV
Signal-to-Noise Ratio:  45 dB
Distortion:  0,5%
Selectivity:  50 dB ±9 kHz
Amplifier Section
Power RMS (both channel driven, 20 Hz - 20 kHz):  40 watts per channel at 8 Ω
Power RMS (both channel driven at 1 kHz):
42 watts per channel at 8 Ω
50 watts per channel at 4 Ω
Total Harmonic Distortion:  0,03% at rated power (0,008% at half rated power, 1 kHz)
Signal-to-Noise Ratio (IHF short circuit A network):
Phono :  77 dB
Tape Play :  98 dB
Dimensions (W x H x D):  422 x 109 x 403 mm (16-5/8" x 4-1/4" x 15-7/8")
Weight:  8,3 kg (18,3 lbs)


JVC JR-S400 receiver


FM/AM Stereo Receiver with S.E.A. Graphic Equalizer
Though in size and looks it's the same as the higher-power JVC model, the JR-S400 has slightly less output power and a correspondingly lower price. Its solidly-built OCL power amplifier section delivers a comfortable 70 watts per channel, min. RMS, into 8 ohms, both channels driven, over a 20 Hz to 20 kHz range, with no more than 0,2% Total Harmonic Distortion. It has virtually the same fine FM?AM section and S.E.A. Graphic Equaliser as the JR-S600, though, and two Phono, two Tape and FM/AM/AUX source selection as well as two-system speaker selection and more.

Power Section
Good transient response and ample power reserve are assured with the pure complementary OCL power amp section, with an initial differential amp followed by a Class A predriver leading to a Darlington-connected parallel push-pull final stage.
Power Supply
A well-regulated transformer improves power response during high-amplitude musical passages, while reducing distortion and crosstalk in the subsonics. No power reserve dry-up is possible thanks to dual huge capacitors. JVC's patented Triple Power protection circuit is included.

Phono Equalizer
The PNP-NPN-PNP phono equalizer accepts up to 200 mV input with negligible distortion. The RIAA curve deviation is ±0,5 dB.

FM and AM Highlights
As in the JR-S600, the tuning capacitor in this precision FM section is the 4-gang, frequency linear type affording, in combination with a low-noise FET, greatly increased FM sensitivity. The up-tilted, super-long (200 mm) FM/AM dial high-inertia dual-flywheel design, a unique lateral-tune control and stretch-free "Radial Cord" cables in the tuning mechanism mean quick, dependable operation. Also as in the more expensive JR-S600, the FM selectivity is increased without harm to other specifications or sound quality by the use of a new 4-resonator single-unit ceramic filter, coupled with a 4-ploe phase-linear LC filter, in the FM IF section.

Other features:
Consstant-Voltage Dual Power Supply
Slider Controls - volume and balance
Push-button source selectors
Two-deck recording/dubbing - Monitor and record to both; dub (copy) from Deck1 to Deck2
FM Muting Off/Mono switch
Loudness High and Low filters
FM Det out Jack
One-touch / 2-system speaker terminals
Internal FM antenna switch
Pre-out
Two AC outlets and more

Specifications
Output Power: 
70 watts per channel, min. RMS, at 8 Ω from 20Hz-20kHz, with no more than 0,2% T.H.D.
80 W per channel into 8 Ω (1 kHz T.H.D. 0,2%)
100 W per channel into 4 Ω (1 kHz, T.H.D. 0,2%)
Intermodulation Distortion:  0,3% at rated output
Damping Factor:  50 at 8 ohms
Load Impedance:
4 - 16 Ω per System 1 or 2
8 - 16 Ω per System 1 +2
Input Sensitivity/ Impedance:
Phono :  2,5 mV (50 k Ω)
Aux :  220 mV (70 k Ω)
Tape Play (PIN, DIN) :  220 mV (70 k Ω)
Signal-to-Noise ratio (IHF Short-Circuit A network):
Phono :  70 dB
Aux :  95 dB
Tape :  95 dB
Recording Output:
PIN :  180 mV
DIN :  30 mV ( 80 k Ω)
Phono Equalizer Deviation:  ±0,5 dB from RIAA Curve
Phono Overload :  200 mV (RMS), 560 mV (p-p)
S.E.A. center Frequencies:  40, 250, 1 j, 5 k , 15 kHz
S.E.A. Control Range:  ±12 dB
FM Tuner Section
Usable Sensitivity:  9,8 dBf (1,7 µV/ 300 Ω)
50 dB Quieting Sensitivity:
Mono :  16 dBf (3,5 µV/300 Ω)
Stereo :  36,8 dBf (38 µV /300 Ω)
Stereo Separation (at REC Out): 
50 dB  at 1 kHz
35 dB at 10 kHz
Distortion [Mono / Stereo]:
100 Hz :  0,1% / 0,25%
1 kHz :  0,1% / 0,25%
6 kHz :  0,25% / 0,4%
Signal-to-Noise Ratio (Max. 1000 µV input):
Mono :  72 dB
Stereo :  65 dB
Alternate Channel Selectivity:  80 dB
Capture Ratio:  1 dB
Image response ratio:  100 dB at 98 MHz
AM Suppression:  55 dB
FM DET Output:  100 mv (10 k Ω)
AM Tuner Section
Sensitivity:
300 µV/m (bar antenna)
30 µV (ex, antenna)
Signal-to-Noise ratio:  55 dB
Dimensions (W x H x D):  560 x 169 x 431 mm (22-1/16" x 6-11/16" x 17")
Weight:  18,5 kg (40,8 lbs)



Cerwin-Vega R26


Cerwin Vega Feature:
Smooth, extended response, low coloration, and good dispersion across the entire audio spectrum

High Efficiency Design - 4 to 10 times more output per watt than competing systems
Enormous Flux Densities for quick precisely damped transient response and accurate reproduction of subtle musical textures
High Energy components with up to 10 dB more undistorted output capability than other systems
"Infrasonic" Back wave tuning for optimum bass coupling to listening room
Circuit Breaker of fuse protection of all hi-frequency drivers.

Inside Design:
Bass you can feel - cervin-Vega woofers combine high efficiency and high power handling ability for more low-distortion output below 50 Hz and quicker transient attack than sluggish acoustic suspension units.

Crisp, Accurate highs - Our exclusive dhorm tweeters feature extremely high flux densities and low mass diaphragms. The result  - superior transient response and flat evenly dispersed output to beyond 20 kHz
Unique "Infasonic" Tuning - basic enclosure resonce of 5-10 Hz eliminates response peaks and "boom" from the audible range.

Outside design
Rugged components - Extra heavy frames and specially treated cones and voice coils maintain flawless performance under demanding use.
Quality cabinets - All cabinets are premium hardwood on hi-density 3/4" particle board, with solid inlays and hand rubbed natural oil finishes for lasting beauty and easy maintenance.
Easy component access - Snap-on grille (except 24) and removable cabinet back allow field-replacement of all components

Adjustable balance - Rotary crossover controls allow precise tailoring of high frequency balance to suit any room and any music

R-26 Specifications
Maximum Power Input:  60 watts RMS; 120 watts peak
Effective Frequency Range:  30 -25,000 Hz
Flat Frequency Range:  38 - 20,000 Hz ±4 dB
Sensitivity (1 watt/1 m at rated power):  96 dB
Maximum Sound Level (1 m at rated power):  113 dB
Dynamic Range (in a 40 dB ambient noise field):  73 dB
Crossover Frequency:  2,500 Hz
Speaker Elements:
Low Frequency:  L-121, 12" (300 mm), 1,6" (40 mm) voice coil, 22 Hz resonance, 7 lb (3,2 kg) magnet system
High Frequency:  DT-6,  2-1/2" (64 mm), 1" (25 mm) voice coil , 15,000 gauss
Dispersion (at 10 kHz):  100°
Impedance:  4 - 8 Ω
Configuration:  Direct radiating , 2-way, Infrasonic ducted cabinet
Dimensions (D x W x H):  300 x 370 x 640 mm (12 " x 14-1/2" x 25")

Cerwin-Vega R24

Cerwin Vega Feature:
Smooth, extended response, low coloration, and good dispersion across the entire audio spectrum
High Efficiency Design - 4 to 10 times more output per watt than competing systems
Enormous Flux Densities for quick precisely damped transient response and accurate reproduction of subtle musical textures
High Energy components with up to 10 dB more undistorted output capability than other systems
"Infrasonic" Back wave tuning for optimum bass coupling to listening room

Circuit Breaker of fuse protection of all hi-frequency drivers.

Inside Design:
Bass you can feel - cervin-Vega woofers combine high efficiency and high power handling ability for more low-distortion output below 50 Hz and quicker transient attack than sluggish acoustic suspension units.
Crisp, Accurate highs - Our exclusive dhorm tweeters feature extremely high flux densities and low mass diaphragms. The result  - superior transient response and flat evenly dispersed output to beyond 20 kHz
Unique "Infasonic" Tuning - basic enclosure resonce of 5-10 Hz eliminates response peaks and "boom" from the audible range.

Outside design
Rugged components - Extra heavy frames and specially treated cones and voice coils maintain flawless performance under demanding use.
Quality cabinets - All cabinets are premium hardwood on hi-density 3/4" particle board, with solid inlays and hand rubbed natural oil finishes for lasting beauty and easy maintenance.
Adjustable balance - Rotary crossover controls allow precise tailoring of high frequency balance to suit any room and any music. (fixed crossover on 24)

R-24 Specifications
Maximum Power Input:  40 watts RMS; 80 watts peak
Effective Frequency Range:  30 -25,000 Hz
Flat Frequency Range:  38 - 20,000 Hz ±4 dB
Sensitivity (1 watt/1 m at rated power):  94 dB
Maximum Sound Level (1 m at rated power):  109 dB
Dynamic Range (in a 40 dB ambient noise field):  69 dB
Crossover Frequency:  2,500 Hz
Speaker Elements:
Low Frequency:  L-120 12" (300 mm), 1,6" (40 mm) voice coil, 22 Hz resonance, 6 lb (2,7 kg) magnet system
High Frequency:  DT-4,  2-1/2" (64 mm), 1" (25 mm) voice coil , 13,000 gauss
Dispersion (at 10 kHz):  100°
Impedance:  4 - 8 Ω
Configuration:  Direct radiating , 2-way, Infrasonic ducted cabinet
Dimensions (D x W x H):  300 x 370 x 640 mm (12 " x 14-1/2" x 25")


Onkyo DX-700


Specifications
Signal Readout System:  Optical non-contact
Reading Rotation: About 500 - 200 rpm (constant kinear velocity)
Linear Velocity:  1,2 - 1,4 m/s
Error Correction System:  cross interleave readsolomon code
Decoded Bits:  1 BIT PWM  Accu Pulse Quartz System
Sampling Frequency:  352,8 kHz (8 times oversampling)
Number of Channels:  2 stereo
Frequency response:  5 Hz - 20 kHz
Total Harmonic Distortion:  0,004% (at 1 kHz)
Dynamic Range:  96 dB
Signal-to-Noise Ratio:  100 dB
Channel Separation:  90 dB (at 1 kHz)
Wow and Flutter:  below threshold of measurability
Output level:  2 V rms
Power Consumption:  12 watts
Dimensions (W x H x D):  455 x 110 x 305 mm (18' x 4-3/8" x 12")
Weight:  4,9 kg (10,8 lbs)

I like

Denon DCD-3300


The DCD-3300 compact laser disc player utilizes a unique Denon Super Linear Converter which prevents deterioration of soun quality in the PCM playback system, assuring accurate reproduction of sound record on compact laser disc, in the studio or in live sound production areas. the parts for this high performance disc player have been selected with careful discrimination, to produce high quality, realistic playback of the full musical production.

Features:
Double Super Linear Converter
This unique, Denon converter system prevents the zero-cross distortion that causes deterioration in PCM reproduction quality. The result is perfect reproduction of concert hall quality.
Optical Isolator
Used for transmitting digital signals, this isolator converts digital signals into optical ones, thereby eliminating undesirable noise interference between tha digital servo and audio circuits.

Wireless Remote Control
An accessory remote control unit has a veriety of general functions such as Play, Stop and Pause and a ten-key key-pad controlling direct music selection, direct programming and time search functions. this  remote control capability gives the DCD-3300 yet greater versatility.
High-performance Digital Filters
The DCD-3300 uses an independent D/A converter for L and R channels, with four, super sampling, high-precision digotal filters. A Denon-original lattice-type linear phase "C.A.L.P." (Computer Analyzed Linear Phase) filter also provides flat frequency characteristics. This analog filter is ideal for ensuring excellent starting characteristics and clear sound reproduction.
Specially-Designed Audio Power Transformer
Two independent power transformers are used for the digital servo and audio circuits. Combined with the large capacity power condeser, they stabilize the audio circuitry.

Sound System Provided with Balance Output
The balance output (load 600 ohm) is operated with a canon connector. Offering three types of output: Fixed, Variable (Imbalance) and Variable (Balance), this sound system can meet professional requirements.
Quick Search Function
A starting point for play canbe designated in seconds, providing easier operation for both reference and professional purposes.
Original Denon Linear Motor
Designed for quick and smooth running, the linear motor greatly reduces access time and improves tracking resolution, resulting in enhanced high fidelity reproduction.
Optical Output of Digital Information
Musical information on a compact disc can be digitally output for reproduction by an external digital processor or D/A unit. An optical output is added to two coaxial outputs, eliminating noise interference and improving sound quality.

Specifications:
Audio
No. of Channels:  two channels
Frequency Response:  2 - 20,000 Hz ±0,2 dB
Dynamic Range:  96 dB
Signal-to-Noise Ratio:  100 dB
Total Harmonic Distortion:  0,0025% (1 kHz)
Separation:   100 dB (1 kHz)
Wow and Flutter:  less than the measuring limit (±0,001% W, peak)
Output Voltage:
Fixed:  2,0 V
Variable :  6,9 V with maximum Line-out volume
Balance Type:  19 dBm/600 Ω load with maximum line-out  volume (Variable output voltage is shown without  600 Ω load on balance type output)
Disc:  Compact disc are used
Playing Time:  60 min/single side
Diameter:  120 mm
Signal Format:
Sampling Frequency:  44,1 kHz
Quantization:  16 bit linear/chnnel
Transmission Bit Rate:  4,3218 Mbits/sec
Digital Output Signal Format
Format :  Digital Audio Interface
Coaxial Output Voltage :  0,5 Vp-p 75 Ω
Optical Power:  -12 dB
Optical Waveform :  650 nm
Pickup
System :  Objective lens drive system, laser pickup
Lens Drive System :  Two-dimensional parallel drive
Ligh Source :  Semiconductor laser
Wavelength :  780 nm
General
Power Supply:  110, 120, 220, 240 V, 50/60 Hz Voltage
Power Consumption:  25 W
Dimensions (W x H x D):  434 x 105 x 360 mm (17,1 x 4,1 x 14,2 inch)
Weight:  14 kg

Function:  Direct selection, automatic search, programmed selection, repeat playback, manual search, index search, time search
Display :  Track number, index number, time, and program
Remote Control Unit :  RC-3300 Infrared pulse system


Luxman D-404


Luxman D-404
Specifications
TYpe:  Compact disc player with optical pickup
Quantization:  16 bit linear
Channels:  2 - stereo
Frequency Response:  5 Hz - 20 kHz  +1,0 dB  -1,5 dB 
Dynamic Range:  80 dB
Total Harmonic Distortion :  0,01% (1 kHz)
Channel Separation:  80 dB
Wow and Flutter:  unmeasurable
Output:  2,0  Volts ±0,5
Pickup:  Semiconductor laser type
Track Location:  by track
Power Supply:  AC 100 V, 120 V, 220 V, 50/60 Hz
Power Consumption:  13 Watts (100V)
Dimensions (W x H x D):  453 x 75 x 300 mm
Weight:  5,1 kg



Philips CD-720


Philips CD-720
Specifications
Frequency Ranger:  2 Hz - 20 kHz
Amplitude Linearity:  0,3 dB (20 Hz - 20 kHz)
Phase Linearity:  4° (20 Hz - 20 kHz
Dynamic Range:  90 db (1 kHz)
Signal-to-Noise Ratio:  90 dB (1 kHz)
Channel Separation:  90 dB (1 kHz)
Total Harmonic Distortion:  0,003% (1 kHz)
Audio Output Level:  2 Vrms
Phono Impedance Socket:  30 - 600 Ω
Power Supply:  110-120, 220-240V, 50/60 Hz
Power Consumption:  less than 100 W approx
Safetey Requirements:  IEC 65
dimensions (W x H x D):  435 x 90 x 300 mm
Weight:  4 kg
Cabinet:  Metal and Polystyrene finish



I like

Arcam Delta 60 amplifier


The Arcam Delta 60 is a powerful, versatile and thoroughly modern hi-fi amplifier.
The Delta 60 is a worthy successor to the famous A&R A60. England's "classic" integrated  amplifier of the late seventies and early eighties. Famed for its reliability and long life, as well as its fine sound quality, over 30 000 A60s are in everyday use worldwide. By making use of the advances in technology that were not available when the A60 was designed, the Delta 60 retains all that was best in that amplifier, whilst improving on it in terms of sound quality, aesthetics and ease of use.
The Delta 60's clean design makes it a perfect match for the Arcam Delta series of hi-fi components. These include the Delta 70 compact disc player (with its optional Delta Black Box outboard D/A cenverter) and the Delta 80 FM/AM Tuner. the Delta 60 is also ideally suited to driving Arcam's range of loudspeakers.

Versatility
The Delta 60 can accept inputs from up to 5 different sources. These include 4 line inputs, normally compact disc, tuner and two tape recorders (one of which can be a VCR). A full tape monitor facility for one of the tape recorders is provided, allowing offtape monitoring of the recorder signal when a three head tape recorder is used. Two tape outputs are available.
the disc input caters for all Types of pickup cartridge. As well as normall MM cartridges, even the highest quality low output moving coil types can be accommodated via the Delta 60's built in low noise MC preamplifier stage. this is switchable from the rear of the amplifier. In addition, the user's chosen cartridge may be optimally matched to the disc pre-amplifier by thw addition of our optional switched loading modules. Versions are available to suit both MC and MM cartridges.
All inputs to the Delta 60 are made via good quality phono sockets. All the line level inputs are fed directly to the volume control, enabling any source to be accepted without distortion, as the overload margin is virtually infinite. The volume control itself is a high quality, friction locked "dual" type. This removes the need for a separate balance control (with a consequent improvement in sound qualit). A mono switch is provided; this is operative on all inputs and can yield significant improvements in noise performance when playing old records or receiving weak FM broadcasts.
Ingenious loudspeaker switching is an Arcam speciality. Two pairs of loudspeakers may be used with the Delta 60 - these are connected via heavy duty, silver plated 4 mm sockekets. The main speaker sockets are hard wired directly to the amplifier's outputs to obtain the best possible sound quality. Headphones can be used in parallel with these. A second set of switched loudspeaker sockets is also available; these can be muted via a front panel switch when not required. This is particularly useful for someone who wants to listen to headphones without disturbing the neighbours.

Quality and Reliability
Great care has been taken with every aspect of the Delta 60's design to ensure first class sound quality and reliability. All components are operated well within their ratings and are laid out on a single large fibreglass p.c.b. (printed circuit board). This virtually eliminates internal wiring and connectors, both potential sources of inconsistency and long term unreliability. Most components are soldered using Arcam's military standard flow soldering and p.c.b. washing equipment. This is followed by a rigorous visual inspection procedure. 100% testing of all major parameters is carried out on every amplifier using advanced computer controlled automatic testing equipment both before and after a gruelling 24 hour burn in procedure. After this every amplifier is given a functional listening test by our final inspection department before packing and despatch.
As with all Arcam electronics, the Delta 60 is warranted for 2 years from date of purchase against failure in normal use.
Styling
The Arcam Delta 60 looks as good as it sounds. This is no accident, because great care was taken from the outset with all aspects of both the mechanical and electronic design.
The elegant, slimline cabinet is construced entirely from aluminium alloy with extensive and imaginative use being made of custom extrusions. Aluminium was chosen because of its excellent thermal characteristics (for cooler running) and nonmagnetic properties (for better ssound quality), in addition to its ease and consistency of fabrication. The cabinet is finished in attractive and durable black epoxy paint.

Power
The Arcam Delta 60 is an extremely well behaved amplifier which has a sufficiently high peak current capability to drive all practical loudspeaker loads down to 4 ohms nominal impedance. Electronic protection in the power stages safeguards against  any incorrect loads or short circuits. This short term protection is backed up by easily replaceable output fuses should a fault persist.
The Delta 60 amplifier is guaranteed to deliver its continuous rated output power of 50 watts per channel into an 8 ohm load at any frequency from 20 Hz to 20 kHz. In practice, under normal music conditions, considerably more power is available. Given loudspeakers of at least moderate efficiency, surprisingly high volume levels are attainable without audible distress.

Electronic Design
The Delta 60's electronics incorporate high gain, high current power amplifiers whose inputs are fed directly from the amplifiers's volume control. By eliminating all line amplifier and tone control stages from the circuitry Arcam have ensured that all the Delta 60's line inputs are always routed straight through to the power amplifiers, eliminating the need for such marketing handles as "CD direct" switches and the like. Due to the amplifier's straightwire input the number of series coupling capacitors has been dramatically reduces with consequent improvements in dynamics and clarity.
The power supply meets Arcam's usual high standards with substantial twin 10,000 uF reservoir capacitors fed from a generously sized 200 VA Holden and Fisher toroidal mains transformer. This has excellent regulation and a very low radiated magnetic field for optimum sonic performance.
The phono pre-amplifier stages of the Delta 60 are of a high standard for an integrated amplifier. They feature fully regulated power supplies and a passive equalisation section between the two main stages which are themselves D.C. coupled to each other. This system provides audibly better resolution and imagery. The input buffer amplifiers use precision Op27 amplifiers for improved noise performance and liberal use is made of 1% metal film resistors and high grade polystyrene and polypropylene film capacitors. In addition the Delta 60 incorporates a high quality switchable MC cartridge pre-amplifier stage fed from its own totally separate regulated supply. Provision is made for customised cartridge loading on both MC and MM inputs via Arcam's unique user adjustable universal cartridge loading modules.

Specifications
Output Power
Both Channels :  50 W at 8 Ω  (20 Hz to 20 kHz , 0,5%)
Single Channel :  60 W at 8 Ω , 95 W at 4 Ω
Peak Current Delivery:  ±10A
Harmonic Distortion:  0,02% (50 W, 8 Ω , at 1 kHz)
Frequency Response:
Disc :  better than 40 Hz - 35 kHz  +0,3 -0,5 dB
Typ. -3 dB  at 20 Hz
Line :  30 Hz  to 35 kHz  ±0,5 dB
Typ. -3 dB  at 10 Hz , 80 kHz
Inputs
Disc (Moving Magnet)
Sensitivity :  1,8 mV
Noise (CCIR) :  -75 dB
Overload Margin at 1 kHz  :  35 dB
Input Impedance :  47 k Ω /100 pF
Switchable Loading Module (type ULM/M) available to provide the following additional loads; 30 k Ω , 8 k Ω , 200 pF, 320 pF, 420 pF and user programmable option
Disc (Moving Coil)
Sensitivity :  160 µV
Noise (CCIR) :  -67 dB
Overload Margin at 1 kHz  :  35 dB
Input Impedance :  220 Ω /4,7 nF
Switchable Loading Module (type ULM/M) available to provide the following additional loads; 100 Ω, 30 Ω, 10 Ω, 100 nF and user programmable option
Tuner, Tape 1, 2
Sensitivity: 160 mV
Noise (CCIR) ref. 1 W output -95 dB
Input Impedance: 10 k Ω
Overload Margin at 1 kHz :  50 dB
CD
Sensitivity :  260 mV
Input Impedance :  6 k Ω
Outputs
Tape 1, 2
Nominal  Output :  160 mV
Input IMpedance :  2 k Ω
Crosstalk (all Inputs):  -70 dB at 1 kHz
Power Consumption:  250 VA maximum
Dimensions (W x H x D):  430 x 64 x 295 mm
Weight:  5 kg Net (6 kg Packed)