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





Kenwood KR-950B

Kenwood KR-950
Quartz Synthesizer Hi-Speed DC Receiver
Features:
Front panel MM/MC cartridge selection
Two-way tape dubbing LED power meters
Quartz PLL frequency synthesized tuner
Automatic seek tuning with High and Low sensitivity selector
6 FM and 6 AM memory presets

Specifications:
Audio Sections
Power Output:  80 W/ch min. RMS, both channels driven into 8 ohms, 20 Hz to 20 kHz with no more than 0,015% THD
Both Channels Driven ( into 8 Ω at 1 kHz):  85 W + 85 W
Dynamic Power Output (at 4 Ω):  250 W
Total Harmonic Distortion (20 Hz -20 kHz from Aux):
Rated power into 8 Ω :  0,015%
1 watt power into 8 Ω :  0,01%
Intermodulation Distortion (60 Hz :7 kHz = 4:1 SMPTE):
Rated power into 8 Ω :  0,01%
Damping Factor:  40 at 1 kHz, 8 Ω
Transist Response:
Rise Time :  2 µs
Slew Rate :  ±50 V/µs
Input Sensitivity/Impedance:
Phono MM :  2,5 mv/ 50 k Ω
Phono MC :  0,25 mv/100 Ω
Tuner,Aux,Tape Play :  150 mV/50 k Ω
Signal-to-Noise Ratio (A weighted):
Phono MM :  86 dB for 2,5 mV input
Phono MM :  92 dB for 5,0 mV input
Phono MC :  68 dB for 0,25 mV input
Tuner,Aux,Tape Play :  104 dB for 105 mV input
Phono Max. Input Level (at 1 kHz):
MM :  200 mV (RMS), THD0,01%
MC :  30 mV (RMS), THD0,1%
Frequency Response:
Phono RIAA Standard  Curve:  20 Hz to 20 kHz ±0,3 dB
Over All (Aux ->Spkr.):  DC Hz to 160 kHz +0 dB, -3 dB
Tone Control:
Bass :  ±8 dB at 100 Hz
Treble :  ±8 dB at 10 kHz
Filter:
Low :  6 dB/oct at 18 Hz
High :  6 dB/oct at 5 kHz
Loudness Control (Vol -30 dB):  +10 dB at 100 Hz
Output Level/Impedance:
Tape Rec Out (PIN):  150 mV/ 1 k Ω
FM Tuner Section
Usable Sensitivity:  10,8 dBf (1,9 µV)
50 dB Quieting Sensitivity:
Mono :  14,2 dBf (2,8 µV)
Stereo :  36,8 dBf (38 µV)
Signal-to-Noise Ratio at 65 dBf:
Mono :  80 dB
Stereo :  74 dB
Total Harmonic Distortion at 1 kHz:
Mono :  0,07%
Stereo :  0,08%
Frequency Response:  30 Hz to 15 kHz +0,5 dB -2 dB
Image rejection Ratio:  80 dB
Spurious Response ratio:  95 dB
IF Response Ratio:  95 dB
Alternate Channel Selectivity:  60 dB at ±400 kHz
AM Suppression Ratio:  60 dB
Stereo Separation:  50 dB at 1 kHz; 40 dB at 50 Hz to 10 kHz
Antenna Impedance: 
Balanced :  300 Ω
Unbalanced :  75 Ω
FM Frequency Range:  87,5 MHz - 108 MHz
AM Tuner Section
Usable Sensitivity:  10 µV (400 µV/m)
Signal-to-Noise Ratio:  48 dB
Image Rejection Ratio:  40 dB
Selectivity:  25 dB
General:
Power Consumption:  65 W (no signal); 3,5 A (UL and CSA); 450 W (IEC); 450 W (others)
AC Outlet:  Switched2, Unswitched 1
Dimensions (W x H x D):  480 x 142 x 350 mm (18-29/32" x 5-19/32" x 13-25/32")
Weight:  9,0 kg (19,8 lb) net

Kenwood KR-930

Kenwood KR-930
Quartz Synthesizer Hi-Speed Receiver
Features:
Quartz PLL frequency-synthesized tuner
Automatic seek and manual tuning
6 FM + 6 AM memory presets
Two tape monitors and dubbing B to A
LED power meters
60 W/ch min. RMS, both channels driven, 8 ohms, 20 Hz to 20 kHz with no more than 0,03% Total Harmonic Distortion
FM Signal-to-Noise ratio 78 dB mono
FM Total Harmonic Distortion 0,08% mono ( 1 kHz)
Dimensions (W x H x D): 18-29/32" x 5-1/14" x 11-5/8"

Weight:  15,0 lbs

JVC R-S5


FM/AM Stereo Receiver
Features:
27 watts RMS per channel into 8 ohms, or 35 watts RMS per channel into 4 ohms
Total Harmonic Distortion is 0,03%
Low-Noise Phono Equalizer with amazing 90 dB S/N
PLL Multiplex Demodulator in IC for Wide FM Separation
Exceptionally high FM S/N by Newly-Developed IC
JVC's Triple Power Protection

Low-Noise Phono Equaliser with amazing 90 dB S/N.
High-calibre specifications result from the sophisticated circuitry, the OCL (Output-Capacitor-less) type power amplifier, and the use of high grade transistors throughout. The result is a discrete phono equaliser giving a very high 90 dB Signal-to-Noise ratio.

Extra Rugged Power Transistor for More
The power amp of the R-S5 is a sophisticated, fully complementary OCL type, with as many as twelve transistors in each channel. The power transistors themselves are extra rugged to provide true performance over a wide range of output. This means more musical margin.

Full Safety is Assured with JVC's Triple Power Protection
This safeguards your system by providing three important functions:
Power On/Off; shock noise never reaches speakers;
Speakers are electronically disconnected in the event that an abnormal DC voltage appears at the terminals; speaker damage is entirely avoided;
Power transistors are protected in the event of shorts, lower speaker impedance or other power-related mishaps.

Tuner Performance in FM and AM is Clean.
The IF amps and a quadrature detector in the R-S5 are in IC form. Distortion is only 0,15% or less (mono), the Signal-to-Noise ratio is an outstanding 82 dB, and the frequency response is 30 to 15,000 Hz.


Akai AA-6000


Solid State Stereo Pre/Main Amplifier

Special features:
120 W music Power
Uiversal,type Voltage Selector
26 Silicon Transistors
Beautiflly Finished Metalic front panel

Specifications:
Output Power:  120 W at music power
Frequency Response:  20 Hz to 50 kHz (-3)
Input Sensitivity/ Impedance:
Phono :   3mv/ / 50 k Ω
Aux :  150 mV / 100 k Ω
Tape:  200 mV / 200 k Ω
Signal-to-Noise Ratio:
Phono :  better than 65 dB
Tape, Aux :  better than 70 dB
Harmonic Distortion:  less than 0,2% (45 W / 8 Ω, 1 kHz)
Residual Noise:  2 mV (80 dB)
Transistors:  26 silicon transistors
Dimensions (W x H x D):  405 x 160 x 290 (15-7/8 x 6-1/4" x 11-3/8")
Weight:  24,2 lbs (11 kg)