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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-V7 receiver

True, it's tempting to be swept up by our power.

150 watt's per channel minimum RMS at 8 ohms, from 20 Hz to 20 kHz, with no more than 0,07% Total Harmonic Distortion , is nothing to sneeze at.

But raw power means nothing. What's important is how that power is delivered. In the case of the STR-V7, it's brought to you by Sony in a very classy package.

You get a combination of features and control that are impressive on their own - but almost unheard of in a single machine. To start with, we've built in a Dolby system, for decoding Dolbyized FM broadcasts. The advantages of our tuner, though, need no decoding. They include a normal and narrow FM IF bandwidth selector. It makes life simple for people in areas where their signals are crowded together albow to elbow.

In our preamp section, the V7 comes equipped with a special phono EQ circuitry. Thanks to Sony's high IQ, it allows for direct connection of a low-output, moving-coil cartridge phono source. Without calling for an external step-up transformer or pre-preamp.

When you're gifted with as much power as the V7, you need a way to keep track of it. This receiver keeps table with two power output meters, monitoring the power being fed to the speakers. So overload can't result from oversight.

And all that power comes from our direct coupled DC power amp. And our power is stable, thanks to a high-efficiency, high regulation toroidal-coil transformer.

There's a lot more to the STR-V7 than power. This receiver takes the best that contemporary technology has to offer, and offers it in a single machine .

Other manufacturers may have the power to bring you power. But only Sony has the power to bring you more than just power

 


Specifications

System

Tuner Section:  Superheterodyne FM/AM Tuner

Power Amp Section :  Direct-coupled pure complementary parallel push-pull circuitry

Preamp Section:  Three-stage equalizer amp in direct-coupled design, NF type tone control amp

Amplifier Section

Continuous RMS Power Output (less than 0,07% T.H.D., both channels driven simultaneously)

At 20 Hz to 20 kHz :  150 +150 watts at 8 Ω 

At 1 kHz :  150 + 150 watts at 8 Ω

According to DIN 45500 :  150 +150 watts at 8 Ω

Dynamic Power Output (IHF Constant power supply method):  400 watts (8 Ω )

Power Bandwidth (IHF):  10 Hz - 35 kHz

Damping Factor:  40 at 1 kHz, 8 ojm

Total Harmonic Distortion

Less than 0,07% at rated output

Less than 0,05% at 1 W output

Intermodulation DIstortion (60 Hz : 7 kHz = 4 : 1)

Less than 0,07% at rated output

Less than 0,0%% at 1 W output

Residual Noise:  less than 0,3 mV (A network)

Inputs Sensitivity/Impedance

Phono MM :  2,5 mV/50 k Ω  (S/N 80 dB, A Weighting Network)

Phono MC :  0,25 mV/100 Ω  (S/N 65 dB, A Weighting Network)

Aux, Tape 1 - 2, Rec/Pb :  150 mV/100 k Ω  (S/N 100 dB, A Weighting Network)

Output Voltage/Impedance

Rec Out 1, 2 :  150 mV/4,7 k Ω

Rec/Pb :  40 mV/82 k Ω

Headphones Output:  8 Ω  - 10 k Ω 

Speaker Output:  8 Ω  - 16 Ω 

Frequency Response:

Phono 1, 2 :  RIAA equalization curve ±0,5 dB

Auz, Tape 1 - 2, Rec/Pb :  5 Hz - 50 kHz +0 -2 dB

Tone Controls

Bass ±10 dB at 100 Hz

Treble ±10 dB at 10 kHz

Filters

High :  6 dB/oct. Above 9 kHz

Low :  6 dB/oct. Below 50 Hz

Loudness Control (att. 30 dB)

+1 dB at 50 Hz

+3 dB at 10 kHz

FM Tuner Section

Tuning Range:  87,5 - 108 MHz

Antenna:  300 Ω  (balanced), 75 Ω  (unbalanced)

Intermediate Frequency:  10,7 MHz

Sensitivity at 46 dB quieting (40 kHz deviation)

Mono :  3,8 µV (16,8 dBf)

Stereo :  45 µV (38,3 dBf)

Usable Sensitivity

1,3 µV ((S/N 26 dB, 40 kHz deviation)

1,7 µV (9,8 dBf, IHF)

Limitting Threshold:  1 µV

Signal-to-Noise Ratio (40 kHz deviation)

Mono :  70 dB

Stereo :  65 dB

Total Harmonic Distortion (40 kHz deviation)

Mono :  0,08% (Normal), 0,2% (Narrow) at 1 kHz

Stereo :  0,15% (Normal), 0,4% (Narrow) at 1 kHz

Intermodulation DIstortion (40 kHz deviation)

Mono :  0,08% (Normal), 0,2% (Narrow) at 1 kHz

Stereo :  0,15% (Normal), 0,4% (Narrow) at 1 kHz

Separation at 1 kHz :  48 dB (Normal), 40 dB (Narrow)

Frequency Response;

40 Hz - 12,5 kHz +0,2 -1,0 dB

30 Hz - 15 kHz +0,2 _1,5 dB

Selectivity

300 kHz :  30 dB (Normal), 55 dB (Narrow)

400 kHz :  55 dB (Normal), 80 dB (Narrow)

Capture Ratio:  1,0 dB

AM Suppression Ratio:  60 dB

Image Response Ratio:  80 dB

IF Response ratio:  100 dB

Spurious Response Ratio:  100 dB

RF Intermodulation:  70 dB

subCarrier Product Ratio:  60 dB

Muting Threshold:  approx 5 µV

AM Tuner Section

Tuning Range:  530 kHz - 1605 kHz

Antenna:  Built-in ferrite-bar antenna

External antenna terminal

Intermediate Frequency:  468 kHz

Uasbla Sensitivity:

200 µV/m (built0in antenna)

100 µV/m (external antenna at 1,000 kHz)

Signal-to-Noise Ratio :  50 dB at 50 mV/m

T.H.D. :  0,5% at 50 mV/m, 400 Hz

Selectivity:  35 dB at 10 kHz

Image Response Ratio:  40 dB at 1,000 kHz

IF Response Ratio:  40 dB at 1,000 kHz

General

Semiconductors:  8 ICs; 4 fet; 69 Transistors, 36 Diodes

Power Requirements:  110,120, 220 or 240 V AC Adjustable 50/60 Hz

Dimensions (W x H x D):  525 x 195 x 450 mm (20-1/2" x 7-1/2" x 17-3/4")

Weight Net :  21 kg (46 lbs 5 oz)