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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





Sony ST-5130 (1973)

The St-5130 incorporates the most advanced Sony techniques in FM tuner technology and full utilization of the available devices.  The MOS FET’s, other all silicon transistors, and solid-state filters employed in the ST-5130 are specially designed to bring out the most in your tuner.
Sensitivity, interference rejection, and other vital factors which affect the quality of a tuner are greatly determined by the characteristics  of the front end. The front end of the ST-5130 has MOS FET’s in the mixer and r.f. stages, thus it achieves exceptionally high sensitivity, overload capability, image rejection, superior cross-modulation rejection, and low internal noise. The ST-5130 delivers clean audio output even if the unit is operated near a powerful transmitter, or receives very weak stations in distant fringe areas.

The fm i.f. section has eight solid-state filters (which are permanently-aligned ceramic filters) to contribute to the tuner’s selectivity and long-term stability. The solid-state filters permit reception of weak signals without interference from strong adjacent stations.
The a-m tuner employs high performance transistors to maintain high sensitivity, with superior signal-to-noise ratio. Its excellent linearity and dynamic range assure low distortion at any strength signal. A-m programs will be received with an audio quality that will surprise hi-fi oriented ears.
The ST-5130 also offers you the newest development in tuner design...... the Impulse Noise Suppressor.

Conventional tuners, even those of high quality, are inevitably affected by impulse-noise caused by ignition, fluorescent lights, generators, or motors. When impulse noise occurs the amplitude of the input signal is disturbed by the impulse. If the impulse is too strong to be removed by the limiter characteristic of the tuner, the impulse remains audible.  In the Sony Ins system, the pulse discriminator is activated when the noise pulse occurs, and cuts the disturbed signals momentarily. The pulse begins and ends within so short a time the human ear does not  notice the “hole” in the sound and hears the program clearly.  This system is especially effective in fm recording.
An effective muting circuit silences all interstation noise as you tune from station to station. This protects the speakers and makes tuning a silky-smooth operation.
The quality of your fm reproduction depends greatly on the signal condition. The ST-5130 offers a center-channel tuning-,eter, a tuner-input level meter, a 75 ohm coaxial input connector and multipath outputs.




Specifications
FM Tuner Section
Tuning range:  87,5 MHz - 108 MHz
Antenna terminals:  300 Ω (balanced),  75 Ω (unbalanced)
Intermediate frequency:  10,7 MHz
Sensitivity:
1,5 μV,  IHF
1,2 μV, S/N =30 dB
Image rejection:  100 dB
IF rejection:  100 dB
Spurious rejection:  100 dB
AM suppression:  60 dB
Capture ratio:  1 dB
Selectivity:  100 dB
Signal-to-noise ration:  75 dB
Frequency response:  20 Hz - 15 kHz,  ±1 dB
Harmonic distortion:
Mono : 0,2%
Stereo : 0,3% at 400 Hz , 100% modulation
Stereo separation:  42 dB at 400 Hz
19 kHz, 38 kHz suppression:  60 dB
SCA suppression:  55 dB
Muting level:  Less than 5 μV
AM Tuner Section
Tuning range:  530 kHz - 1,605 kHz
Antenna:  Built-in ferrite bar antenna and external antenna terminal
Intermediate frequency:  455 kHz
Sensitivity:
Built-in antenna : 50 dB/m
External antenna : 20 μV
Signal-to-noise ratio:  50 dB
Image rejection:  45 dB at 1,000 kHz
IF rejection:  41 dB at 1,000 kHz
Harmonic distortion:  0,6%
General
Outputs:  
Fixed : 750 mV,  10 kΩ impedance
Variable : 0 -2 volts,  1,8 kΩ impedance
Multipath (Verical/Horizontal) : 150 mV,  18 kΩ impedance
System:  FM Stereo, FM/AM superheterodyne
Semiconductors:
4 FET + 22 transistors for reception
5 FET + 26 transistors for auxiliary circuits
41 diodes
Power requirement:  120 volts, 50/60 Hz
Power consumption:  25 watts
Dimensions (W x H x D):  400 x 149 x 344 mm (15 ¾ x 5 ⅞ x 13 ¾ inches)
Weight:
net:  7,5 kg (16 lb 8 oz)
Shipping carton:  22 lb 4 oz

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