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)