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





Hitachi SR-703

SR-703 (1977)
The SR-703 is an outstanding value because it offers the power most of today's inefficient speakers demand with no more than 0,3% total harmonic distortion. This receiver delivers 40 watts per channel RMS into 8 ohms from 20 to 20,000 Hz. 
Feautres Includes:
High quality FM tuner,
High selectiviy and low distortion IF amplifier using IC and 2 ceramic filters
Quadrature detection,
Phase lock loop circuitry, for FM/MPX circuit,
A ceramic filter IC in AM tuner
Two large easy-to-read meters,
Large-sized flywheel tuning knob,
All-stage direct -connection inverted Darlington OCL amplifier,
New ICs in the equalizer and main amplifier
Electronic power protection circuit,
High filter,
Detent controls,
Tape dubbing
Source monitor.
Two speaker system connections
Specifications:
Audio Section
Min. RMS Continuous Power Output (both channel driven): 
40 W + 40 W (8 Ω, 20-20,000 Hz, THD 0,1%)
55 W + 55 W (8 Ω, 1 kHz, THD 0,1%)
60 W + 60 W (4 Ω, 1khz, THD 0,1%)
Music Power (IHF):  65 W + 65 W per channel into 8 ohms
Power bandwidth:  10 Hz - 30 kHz
Frequency Characteristics:  10 Hz - 30 kHz ±1 db
Total Harmonic Distortion: 
At rated output :  less than 0,3%
At ½ rated output:  Less than 0,07%
Intermodulation Distortion:
At rated output :   0,5%
At ½ rated output:   0,1%
Input Sensitivity/Impedance:
Phono :  2,5 mV/47 k Ω
Aux :  200 mV/50 k Ω
Tape 1, 2 :  200 mV/50 k Ω
Adaptor :  200 mV/50 k Ω
DIN :  450 mV/70 k Ω
Output level
Tape Out :
200 mV : phono, Aux at rated input;
200 mV : FM 400 Hz, 30% dev. Input; 1 mV;
200 mV : AM 400 Hz, 30% mod. Input ; 1mV
DIN Out :  40 mV (phono at rated input)
Signal-to-Noise Ratio (IHF, Input shorted, A-network, rated power):
Phono :  70 dB
Aux :  80 dB
Tape :  80 dB
Damping Factor:  30 (1 kHz, 8 Ω)
Equalizer:  RIAA ±1 dB
Bass Control:  ±10 dB at 100 Hz
Treble Control:  ±10 dB at 10 kHz
Loudness Control:  +9 dB at 100 Hz ; +4 dB at 10 kHz
High Filter:  -5 dB at 10 kHz
Semiconductors:  5 ICs; 1 FET; 24 Transistors; 35 Diodes; 1 Thyristor
FM Section
Frequency Range:  88 - 108 MHz
Usable Sensitivity (IHF):   1,8 µV
Signal-to-Noise Ratio [Mono/Stereo]:  74 dB / 68 dB
Total Harmonic Distortion [Mono/Stereo]:
At 100 Hz :  0,3% / 0,4%
At 1 kHz :  0,2% / 0,3%
At 6 kHz : 0,3% / 0,3%
Frequency Response:  30 Hz - 15 kHz  +0,2 -1,5 dB
Image Response Ratio:  56 dB
Spurious Response Ratio:  80 dB
IF Response Ratio:  90 db
Altenate Channel Selectivity:  60 dB
Capture Ratio:  1 dB
AM Suppression:  55 dB
Stereo Separation:  40 dB
SCA Rejection: 65 dB
Muting Threshold:  14 µV
Antenna Input:
Balanced :  300 ohms
Unbalanced :  75 ohms
AM Section
Frequency Range:  530 - 1,605 kHz
Sensitivity:  300 µV/m (S/N 20 dB);  20 µV (IHF, ext. Antenna)
Image Rejection:  50 dB
IF Rejection:  50 dB
Selectivity (IHF):  36 dB
Signal-to-Noise Ratio:  50 dB
Antenna:  Ferrite and separate terminal

Tape Monitor:  1,2
Speaker Switch:  A, B, A + B
Speaker terminal:  One-touch terminal
Power Supply:  100/120/220/240 V 50/60 Hz
Power Consumption:  320 W
Dimensions (W x H x D):  489 x 143 x 400 mm

Weight:  11,5 kg (25,4 lbs)

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