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 TA-70 amplifier

Integrated Stereo Amplifier
A compact amplifier at a sensible price incorporating all the features necessary to form the centre-piece of a complete hi-fi system. Designed for combination with the ST-70 tuner.

This integrated stereo amplifier, model TA-70 combines performance with economy. A sensibly priced unit which has been designed with all the experience that has made Sony world famous for quality in hi-fi. Features include, selector for magnetic or ceramic cartridge, tape/source monitor switch, headphone jack, DIN connector socket, high filter switch and facilities for SQ quadrophonic sound by connecting model SQA-200 decoder amplifier.
Styled to match stereo tuner ST70, model TA70 is surely a sound investment.
Rated Output:  8 watts per channel, both channels operating load 8 Ω at 1 kHz
Power Bandwidth:  30 Hz - 20 khz
Total Harmonic Distortion: 5% at rated output power
Inputs Sensitivity/Impedance:
Phono 1 :  3,5 mV/50 k Ω
Phono 2 :  300 mV / 1 m Ω
Tuner :  250 mV/100 k Ω
Aux :  250 mV/100 k Ω
Tape :  440 mV/100 kk Ω
Rec/Pb :  440 mV/100 k Ω
Outputs Level/Impedance
Rec Out :  250 mV/10 k Ω
Rec/Pb :  30 mV/80 k Ω
Tone Controls:
Bass :  100 Hz ±10 dB
Treble :  10 kHz ±10 dB
Loudness Control :  100 Hz + 8 dB; 10 kHz =4 dB ( att -30 dB)
Filter : 
High :  3 dB/oct above 5 kHz
Circuit System:  Quasi-complementary symmetry circuit
SEPP OTL:  amplifier
Semiconductors:  20 Transistors; 2 Diodes
Power Requirements:  AC 240 V 50 Hz
Power Consumptions:  70 watts
Dimensions (W x H x D):  330 x 87 x 245 mm (13" x 3-1/2" x 9-7/10")
Weight:  2,8 kg (8 lb 6 oz)

Sony ST-70 tuner

AM/FM Stereo Tuner
A stereo tuner offering many facilities normally found inn more expensive models. It provides for a reasonable price the additional dimension of a stereo radio to your hi-fi system.

An incredibily compact AM/FM stereo tuner offering facilities normally found inn more expensive models. These include MPX decoder for FM stereo, AFC switch, tuning meter, stereo indicator ligt, built-in AM/FM aerials and external antenna terminals for AM/FM.
For clarity, purity , and economy model ST-70.
FM Tuner Section
Tuning Range :  87,5 - 108 MHz (3,43 - 2,78 m)
Aerial Antenna:  300 Ω balanced
Intermediate Frequency:  10,7 MHz
Sensitivity:  2 µV, (s/n30 dB)
Signal-to-Noise ratio:  65 dB
Capture Ratio:  4 dB (IHF)
Image Rejection:  40 dB (IHF)
IF Rejection:  90 dB
AM Suppression:  45 dB
Frequency Response:  20 -15,000 Hz ±3 dB
Harmonic Distortion : 
Monaural :  0,5% at 400 Hz
Stereo :  1,0 % at 400 Hz
Stereo Separation:  35 dB at 400 Hz
AM Tuner Section
Tuning Range:  530 -1605 kHz (566 - 187 m)
Aerial:  Built-in ferrite bar aerial and external aerial terminal
Intermediate Frequency:  469 kHz
Sensitivity MW:  48 dB/m built-in aerial, 20 µV external aerial
Signal-to-Noise Ratio:  50 dB
Output Level:
High :  2 V
Normal :  750 mV
Circuit System:  FM/AM superheterodyne tuner
Semiconductors:  14 Transistors;  1 FET; 15 Diodes
Power Requirements:  AC 240 V 50 Hz
Power Consumption:  8 watts
Dimensions (W x H x D):  330 x 87 x 245 mm (13" x 3-1/2" x 9-7/10") including projecting parts
Weight:  2,8 kg (6 lb 2 oz)

Onkyo TA-2040

Stereo Cassette Tape Deck
This front loading cassette deck has everything needed to produce excellent sound; Onkyo's S&S sendust Rec/Pb head for metal tapes, a bright, long life flourescent display for precise and instantaneous level readings, Dolby NR, phase-locked loop, FG-servo DC motor drive system, auto-stop circuitry, soft-touch controls, and a remote control socket for use with the Onkyo RC-5 unit.

Track System:  4-track, 2-channel stereo
Recording System:  AC bias
Erasing System:  AC erase
Tape Speed:  4,8 cm/sec
Wow and Flutter:  0,055% (WRMS)
Frequency Response:
Normal Position :  20 -15,000 Hz
High Position :  20 -17,000 Hz
Metal Position :  20 - 19,000 Hz
Signal-to-Noise Ratio (Dolby NR out, 60 dB, Metal Position Tape) A noise reduction of 10 dB above 5 kHz and 5 dB at 1 kHz is possibile with the Dolby NR In
Input Jacks:
Microphone Jacks :  2
Minimum Input Level/ Impedance :  0,3 mV/5 k Ω
Optimum Mic Impedance:  200 Ω - 50 k Ω
Line In :  2
Minimum Input Level/Impedance :  50 mV/50 k Ω
Line Out :  2
Output Level :  0,480 V (at 0 dB)
Output Impedance :  over 50 k Ω
Headphone Jack :  1
8 Ω / 200 Ω
Motor :  FG Servo DC Motor
Heads:  Sendust head
Components:  43 Transistors;  19 Diodes; 8 IC; 5 LED
Power Supply:  AC 110.120.220,240 V 50/60 Hz [AC 240 V  50 Hz or 120 V 60 Hz, AC]
Power Consumption:  25 W
Dimensions (W x H x D):  418 x 120 x 330 mm (16-7/16" x 4-3/4" x 13")
Weight:  6,4 kg (14,1 lbs)

Optonica RP-105H turntable

Optonica RP-105H
Fully-automatic Stereo Turntable with Double Direct Drive System
For superior performance, greater reliability and easier operation, electronic control systems are used throughout the RP-105H. Separate direct drive platter and tonearm motors assure extrastable platter rotation plus maximum tonearm trackability. An electronic servo control maintains platter speed precision, while a microprocessor controls the operation of the tonearm. When the unit is turned off, a solenoid supports the tonearm and locks it in place. Electronic control systems are also used to protect the stylus in case of power failure and to handle cuieing operations. The RP-105H also features remote control mode selection plus play/cue functions. The stylus is protected and extra operating procedures are eliminated by the auto record size/presence detector.

Type:  full-automatic
Motor:  FG Servo motor
Drive System:  Direct-drive system
Turntable Platter :  aluminum die-cast
Platter Diameter:  300 mm
Speed:  33-1/3 and 45 rpm
Speed Control Range :  ±4%
Wow and Flutter:  ±0,06% (DIN 45 500);  0,04% WRMS (JIS C-5521)
Rumble:  47 dB (DIN A);  65 dB (DIN B)
Tonearm Type:  Static-balanced S-shaped tonearm
Effective length:  215 mm
Overhang:  16 mm
Off-Set-Angle:  23°
Cartridge Weight Range:  4 - 10 g
Stylus pressure Range:  1 - 3 g
Type:  Magnetic type
Output Level:  7 mV
Frequency Response:  20 Hz - 20 kHz
Channel Separation:  20 dB
Channel Balance:  3 dB
Recommended Load Impedance:  47 k Ω
Weight:  4,5 g
Recommended Stylus Pressure:  2 g
Power Source:  110, 20, 240 V 50/60 Hz AC
Power Consumption:  10 W
Dimensions (W x H x D):  430 x 120 x 355 mm
Weight:  7 kg