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

Pioneer PL-12D

With this well-made stereo turntable, Pioneer proves once again that quality and parcticality are synonymous. The budget-prieced PL-12D gives you more for your stereo investment than you'd ever expect. A fine synchronous motor that helps cut out audible wow and flutter. An extremely steady belt-drive. An anti-skating control to lessen distortion. A cueing device with simultaneous movement with the start lever. And a beautifully-balanced S-shaped tonearm with plug -in type lightweight head-shell. For the man about to make his first investment into stereo components, the PL-12D becomes more than a budget investment but a truly professional turntable that will serve him well for many years of quality sound reproduction.
 Drive Motor Section
The Pl-12D employs a 4-pole synchronous motor and a belt-drive system to ensure stable rotation of the turntable platter that is free from line voltage fluctuation. The synchronous motor is much like the motors usually used only in expensive turntables, and is the quietest that you can own. It gives you an extremely high Signal-to-Noise ratio, extremely low wow and flutter, and helps cut down on irritating motor vibration

Tonearm Section
The tonearm of the PL-12D is the static-balanced, S-shaped type that uses a super hard alloy material aat the pivot point of its arm, thereby assuring sesnsitive, stable tracking at all times. The counter weight of the tone arm is the stylus pressure direct reading type that gives easy weight adjustment when cartridge-changing is necessary. Then there is a lightweight plug-in type headshell so that you may use a cartridge with its stylus pressure from 0,75 grams. To cut down on distortion, the PL-12D has an anti-skating control to suppress the harmful inward force of the stylus.

Other Distinctive features
The cueing control an oil-damped arm elevation device, is connected to the start lever and helpd prevent damage to your stylus or your record usually caused by misoperation. There is a stylus position gauge to facilitate easy installation of your favorite cartridge. And Pioneere used aluminum foil on the inner part of the Pl-12D's wooden cabinet to prevent external noise often caused by yoour amplifier or other equipment placed near the turntable. The cabinet itself elegantly styled is the spring-suspension type and designed to cope with external vibraation. The dust cover of the Pl-12D is hinged in the free-stop manner, permitting you to leaave it at rest at any angle you choose.
Motor:  4-pole synchronous motor
Drive System:  Belt-driven
Speed:  33 and 45 rpm
Turntable Platter:  300 mm (12") zinc die-cast turntable
Platter Weight:  1,2 kg (2 lb 10 oz)
Signal-to-Noise Ratio:  better than 47 dB
Wow and Flutter:  less than 0,1% (WRMS)
Tonearm:  Static-balanced type S-shaped
Arm Effective Length:  221 mm
Overhang: 15,5 mm
Max.Usable Cartridge Weight;  10 grams
Power Requirements:  110 - 130 V, 220 - 240 V, AC 50/60 Hz
Power Consumption:  11 Watts
Dimensions (W x H x D):  430 x 164 x 362 mm (16-15/16" x 6-15/32" x 14-1/4")
Weight:  7,4 kg (16 lb 5 oz)

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)