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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 STR-313L

Stereo Receiver Features

Programme sensor so that 5 stations on both FM and LW can be preprogrammed. Using the pre-set markers, and the programme buttons, any of your favourite stations can be pre-set. When the programme sensor position is selected any pre-set station on FM or LW can be picked up as you move the tuning indicator


25 watts per channel at 8 ohms into 20 Hz - 20 kHz

4 wavebands; Fm, MW, SW,LW

Loudness switch for improved sound at low listening levels

Separate controls for bass and treble

Automatic muting in stereo mode

FM and LW programme sensor indicators

Programme sensor indicator

Stereo indicator light

Function indicators for tape,phono and tuner

Separate signal strength and centre tuning meters

Headphones socket

Audio Amplifier Section

Power Output Continuous RMS

Less than 0,5% THD, both channel driven simultaneously:

25 W + 25 W (8 Ω) at 20 - 20,000 Hz

27 W + 27 W (8 Ω) at 1 kHz

According to DIN 45500

25 W + 25 W (8 Ω)

25 W + 25 W (4 Ω, less than 0,7% THD)

Dynamic Power Output: IHF constant power supply method 90 W (8 Ω)

Power Bandwidth: 10 - 40,000 Hz, IHF

Damping Factor: 20 at 1kHz (8 Ω)

Total Harmonic Distortion:

Less than 0,5% at rated output (8 Ω)

Less than 0,7% at rated output (4 Ω)

Less than 0,2% at 1W output (8 Ω)

Less than 0,3% at 1W output (4 Ω)

IM Distortion (60 Hz : 7 kHz = 4 :1):

Less than 0,5% at rated output

Less than 0,2% at 1W output

Residual Noise: Less than 0,08 μW (8 Ω)

Frequency Response

Phono: RIAA equalization curve ±1 dB

Tape: 10 -50,000 Hz +1 dB, -3 dB

Inputs Sensitivity/impedance (¹):

Phono: 2,5 mV(-50 dB)/50 kΩ, 70 dB S/N

Tape: 150 mV (-15,5 dB)/100 kΩ, 90 dB S/N

Outputs (with rated input):

Rec Out: 150 mV (-15,5 dB)/ 10 kΩ

Headphones: Accepts all low or high impedance headphones

Speaker: From 4Ω to 16Ω speakers are suitable

Tone Controls:

Bass: ±8 dB at 100 Hz

Treble: ±8 dB at 10 kHz

Loudnes Control: +8 dB at 100 Hz; +3 dB at 10 kHz (att. 30 dB)

FM Section

Frequency Range: 87,5 - 108 MHz

Antenna: 300 Ω Balanced; 75 Ω unbalanced

Intermediate Frequency: 10,7 MHz

Sensitivity at 50 dB Quieting:

Mono: 3,5μV (10,7 dB)

Stereo: 45μV (33 dB)

Sensitivity at 46 dB Quieting (at 40 kHz deviation):

Mono: 4μV (12 dB)

Stereo: 50 μV (34 dB)

Usable Sensitivity (at 40 Hz deviation):

1,8 μV (5 dB), IHF

1,6 μV (4 dB), S/N = 26 dB

S/N Ratio: 75 dB (mono); 70 dB (stereo)

Harmonic Distortion:

At 100 Hz : 0,2% (mono); 0,3% (stereo)

At 1 kHz : 0,2% (mono); 0,3% (stereo)

At 10 kHz : 0,3% (mono); 0,5% (stereo)

IM Distortion: 0,2% (mono); 0,3% (stereo)

Separation:

30 dB at 100 Hz

45 dB at 1 kHz

35 dB at 10 kHz

Frequency Response:

40 - 12,500 Hz +0 -5/-1 -0 dB

30 - 15,000 Hz +0 -5/-2 -0 dB

Selectivity:

60 dB (400 kHz)

40 dB (300 kHz, S/N=26 dB, 40 kHz deviation)

Capture Ratio: 1,0 dB

AM Suppression Ratio: 54 dB

Image Response Ratio: 45 dB

IF Response Ratio: 90 dB

Spurious Response Ratio: 75 dB

RF Intermodulation: 60 dB

Muting Threshold: Approx. 5μV

SW/MW/LW Section

Frequency Range

SW : 5,8 - 15,8 MHz

MW : 530 - 1,605 kHz

LW : 150 - 350 kHz

Antenna:

SW/MW External antenna terminal (Attached antenna wire)

LW: Built-in Ferrite-rod antenna (External antenna terminal)

Intermediate Frequency: 468 kHz

Usable Sensitivity:

SW: 30 μV (29,5 dB) external antenna 910 MHz)

MW: 100 μV (40 dB) external antenna (1,000 kHz)

LW: 500 μV/m (53,8 dB0 built-in antenna; 100 μV (40 dB) external antenna (230 kHz)

S/N Ratio:

SW/MW: 52 dB 95 mV)

LW: 52 dB (50 mV/m)

Harmonic Distortion:

SW/MW: o,3% (5mV, 400 Hz)

LW: 0,3% (50 mV, 400 Hz)

Selectivity:

28 db (9 kHz)

30 dB (10 kHz)

General

Power Requirements: 120, 220, 240 V AC 50/60 Hz

Power Consumption: 180 W, 210 W (UK model)

Dimensions( W x H x D): 410 x 145 x 310 mm (16" x 5¾" x 12½")

Weight Net.: 7,6 kg (16 lb 13 oz)

(¹) Measured with rated output power into 8Ω loads (both channels driven simultaneously) at 1 kHz

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