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





B&O Beomaster 1900

 The Beomaster 1900 Receiver
The dramatic center of the Beosystem 1900 is the Beomaster 1900 receiver. Its operation borders on magical, its performance is without audible flaw,,its aesthetics are beyond reproach. It is a component which has truly domesticated high fidelity.
All major functions of the 1900 receiver are controlled by touch-sensitive electronic switches: the sculpted depressions aligned along the top panel. They are volume, input selection, selection of up to five user pre-set FM stations, and standby. These controls function electronically, completely eliminating mechanical linkages which can wear out or become misaligned (estimated to cause approximately 80% of service problems).
 When any of the electronic controls are touched, a lighted indicator immediately appears directly above. You always know the operational status of the 1900, even from across the room.
 The 1900 also allows you to pre-set up to five FM stations for instant, electronically accurate recall. Four separate tuning indicators and the main random tuning dial are located under the aluminum lid. By tuning the four indicators to those stations you listen to most frequently, they may be recalled by simply touching their respective control on the front panel. The main tuning dial can also be set at a preferred station and this station immediately recalled by a control on the front panel. Random tuning is accomplished by a flush-set tuning control moved effortlessly by a single finger. Also, positioned under the aluminum cover is the AFC which, when in effect, eliminates drift from the stations you select.
Also found under the aluminum lid are the controls for adjusting bass, treble, and balance between your speakers. These controls are smooth sliding potentiometers. Easily viewed, illuminated indicators are used to show visually the extent to which the controls have been moved from their neutral position.
 The Beomaster 1900 receiver has a split power supply which provides optimum performance throughout the frequency range. All output transistors are usd conservatively and an electronic protection circuit automatically respondes to any overload, breaking the circuit and preventing any damage from occuring to receiver or speakers. The tuner section of the 1900 utilizes FETs for high sensitivity and selectivity,PLL circuitry is used to guarantee excellent channel separation and greater long term circuit stability. Ceramic filters and integrated circuits in the IF amplifier and stereo decoder provide excellent separation and low harmonic distortion.

Specifications
Amplifier Section
Power Output (1000 Hz RMS):  2 x 30 W at 4 Ω; 2 x 20 W at 8 Ω
Music Power :  2 x 50 W at 4 Ω ; 2 x 30 W at 8 Ω
Speaker Impedance:  4 Ω
Harmonic Distortion:
1000 Hz, 50  mW :  less than 0,07%
DIN 45 500, 40 - 12,500 Hz :  less than 0,13%
Intermodulation DIN 45 500 :  less than 0,15%
Frequency Range (±1,5 dB DIN 45 500):  20 - 40,000 Hz
Power Bandwidth (1% distortion):  10 - 40,000 Hz
Damping Factor (1000 Hz):  better than 70
Input Sensitivity/Impedance:
Pick-up:  3 mV/47 k Ω
Tape:  220 mV/ 470 k Ω
Signal-to-Noise Ratio (DIN 45 500):
Pick-up (50 mW) :  better than 60 dB
Tape recorder (50 mW):  better than 65 dB
Channel Separation
1000 Hz (DIN 45 500):  better than 56 dB
250 - 10,000 Hz :  better than 38 dB
Output Level:
Tape Recorder (1000 Hz DIN 45 500):  100 mV/100 k Ω
Headphones :  max, 6 V/200 Ω
Bass Control at 40 Hz :  ±18 dB
Treble Control at 12,500 Hz :  ±15 dB
Tuner Section
FM Range:  87,5 - 108 MHz
Sensitivty [stereo 46 dB]:  less than 30 µV/75 Ω
Signal-to-Noise Ratio  [stereo, weighted]:  better than 60 dB
Frequency Range (DIN 45 500, ±1,5 dB):  20 - 15,000 Hz
Harmonic Distortion (DIN 45 500):  less than 0,4%
Stereo Channel Separation (1000 Hz):  better than 35 dB
Pilot Suppresion
At 19 kHz:  better than 45 dB
At 38 kHz :  better than 50 dB
General Section
Power Supply:  110 - 130 - 220 - 240 V; 50/60 Hz
Power Consumption:  25 - 185 W
Dimensions (W x H x D):  620 x 60 x 250 mm
Weight:  7,6 kg

Rotel RP 845 Turntable


Following the fabulous and highly acclaimed RP850 and RP830 turntables, Rotel proudly present the newest turntable with the same outstanding ability to deliver sheer musical performance  at a realistic price. A high standard finished wood cabinet supported by a heavy metal bottom chassis, a tonearm stem fixed independently on a thick  center metal plate, a close-tolerance smooth center spindle, specially designed highly effective insulator feet, a super damped Norsorex mat, the heavy aluminum diecast platter, an attractive smoked dust cover with the insulated hinges etc. Plus a high quality, high rigid tonearm with special radial bearings for both horizontal and vertical planes. An end result is the usual Rotel's outrageously musical enjoyment. Naturally, perfectly compatible with all the other Rotel  high performance components.

Specifications:
Motor:  4-pole hysteresis synchronous motor
Drive:  belt-drive system
Speeds:  33-1/3 and 45  pm
Tonearm System:  Static balanced straight pipe arm, direct readout stylus gaude, anti-skate control
Wow and Flutter:  less than 0,04%
Signal-to-Noise Ratio:  70 dB (DIN-B)
Dimensions (W x H x D):  430 x 140 x 360 mm
Weight:  7,4 kg


H.H. Scott PS87A Turntable


PS87A Fully-Automatic Direct-Drive Turntable with Srobe
The Scott PS87A boasts an unmatched combination of the most wanted features. And, at a suprisingly affordable price. Automatic start, reject, return and shut-off plus single play or repeat functions provide the ultimate in convenience.
Featured strobe light with adjustable speed controls (±3%)
Viscous damped arm lifter with cueing lever
Direct readout stylus pressure and anti-skating controls
Record size selector
Spare handshell receptacle 12" finished diecast platter with strobe pattern
Low-capacitance phono cables and hinged dust cover
Unipivot suspension statically-balanced "S" shaped tonearm minimizes tracking error

Specifications:
Type:  Direct-drive full automatic
Motor:  electronically controlled DC motor
Turntable Platter:  12-inch (300 mm), aluminium diecast
Drive System:  Direct drive
Speedas :  33-1/3 and 45 rpm
Pitch Control Range:  ±3%
Wow and Flutter:  0,03%
Signal-to-Noise Ratio:  60 dB
Tonearm: 210 mm, static balanced, adjustable weight and anti-skating
Stylus pressure Range:  1 - 3 grams
Antiskating Range:  0 - 4 grams
Power Requirements:  AC 220V, 50 Hz; AC 120 V, 60 Hz
Power Consumption:  11 watts
Dimensions (W x H x D):  448 x 150 x 354 mm (17-2/3" x 5-3/4" x 13-5/6")
Weight [net]:  7,8 kg (17 lbs)


JVC RX-503 Receiver


Receiver System Control Center with AV remote control and computer-controlled S.E.A. graphic equalizer
Features 
CSRP improved, with factory-preset values added to the comprehensive display facility; the user can see the settings and use it more easily.
With this, the optimum values of the settings of volume, balance, loudness, SEA, surround, etc, for each source can be stored in memory and recalled immediately while the settings will be shown on the FL display in sequence, whenever the corresponding source is selected. As factory-preset values for each source are stored in the memories of these receivers, these can be recalled when the receivers are switched on for the first time. Therefore, these values can be used as they are as well as modified to the user's preference. In addition, as the remote control units provided with most receivers incorporate a convenient CSRP display, you can check the values and perform adjustment without leaving your listening position.

CCS - COMPU Link Communication System Interactive.
This CCS system gives further interactive information to the JVC-exclusive COMPU LINK system, by indicating the current source or operation mode you've commanded,, or volume up/down, even the station name and SEA pattern recalled.

Five programmed and five user preset equalization patterns
The graphic equalizer not only allows the user to create five custom equalization  patterns and store them in memory for later recall but also lets the user call up one of five pre-programmed equalization patterns; heavy, Clear, Soft, Movie and Vocal.

SEA equalization pattern name memory/indication
Together with the five user-programmable equalizer patterns, top-end receivers have a pattern name input, and display capability. In the same way as that for station names, up to five or  four  (RX-503) characters or numerals can be stored in memory.

40 FM/AM random station preset memory
All JVC receivers include a computer-controlled digital synthesizer tuner featuring preset memory of up to 40 broadcast stations for FM and AM randomly.
This feature lets the user to preset almost any FM or AM station to be listened to, for immediate pushbutton recall.

Other Features on JVC receivers
Station name memory with alphanumeric display
Auto memory functions
Preset scan function
Sound selector


Specifications
Amplifier Section
Output Power (2-channel operation):  2 x 80 watts RMS (8 Ω, 20 Hz - 20khz, 0,03% T.H.D.)
Intermodulation Distortion:  0,03% at 80 watts
Input Sensitivity/Impedance:
Phono :  2,5 mV/47 k Ω
Tape 1 Play :  200 mV/47 k Ω
Tape 2, CD, Video :  200 mV/47 k Ω
Recording Output level:  200 mV
Frequency response:
Phono (RIAA eq.) :  20 Hz - 20 kHz ±0,5   dB
Tape 1 Play :  10 Hz - 50 kHz ±1 dB
Tape 2, CD, Video :  10 Hz - 50 kHz ±1 dB
Signal-to-Noise ratio:
Phono :  71 dB ('66 IHF); 78 ('78 IHF, Rec Out)
Tape 1 Play :  91 dB ('66 IHF); 85 dB ('78 dB)
Tape 2, CD, Video :  91 dB ('66 IHF); 85 dB ('78 dB)
S.E.A. Section
Center Frequencies:  63 Hz. 160 Hz, 400 Hz, 1 kHz;  2 ,5 kHz;  6,3 kHz; 16 khz
Control range:  ±10 dB
FM Tuner Section (IHF)
Tuning Range:  87,5 MHz - 108 MHz
Usable Sensitivity [mono]:  10,8 dBf (0,95 µV/ 75 Ω)
50 dB Quieting Sensitivity :
Mono :  16,3 dBf  (1,8 µV /75 Ω) 
Stereo :  38,3 dBf (22,5 µV/75 Ω)
Signal-to-Noise Ratio (IHF-A net, 85 dBf):
Mono :  80 dB
Stereo :  73 dB
Total Harmonic Distortion (1 kHz):
Mono :  0,15%
Stereo :  0,2%
Frequency Respponse:  30 Hz - 15 kHz ; +0,5 dB -3 dB
Capture ratio (85 dBf):  1,5 dB
Alternate Channel Selectivity:  60 dB (±400 kHz)
IF Response Ratio:  85 dB (at 98 MHz)
Stereo Separation:  40 dB (at 1 kHz)
AM Tuner Section
Tuning Range:  530 kHz - 1710 kHz
Sensitivity:  30 µV (external); 300 µV /m (loop antenna)
Signal-to-Noise ratio:  50 dB (100 mV/m)
Selectivity:  25 dB (±10 kHz)
Image response Ratio:  40 dB
IF Response Ratio:  60 dB
Total Harmonic Distortion:  0,5% (100 mV/m)
General
Power
Requirements :  AC 120 V or 230 V 50/60 Hz
Consumption :  290 watts, 380 VA
Dimensions (W x H x D):  435 x 125 x 330 mm (17-3/16" x 4-15/16" x 13")
Weight:  8 kg (17,7 lbs)
Remote Control :  RM-SR503U