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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





Pioneer CT-3131 cassette deck

A stereo cassette tape deck with wide frequency response range, chrome tape selector and a range of new,versatile professional features.

New tape technology has led to outstanding improvements in the sound of cassette tape, and Pioneer's new CT-3131 stereo cassette tape deck is designed to make the very most of these improvements. With its extra wide frequency response range of 30 to 15,000 Hz with the new chromium dioxide tape, the CT-3131 compares more than favorably with many reel-to-reel decks now available on the market. With its new permalloy solid head and 1,5 µ narrow gap, it deliveres sound that will start you thinking all over again about the reality of cassette tape for professional sound quality. As one of Pioneer's most advanced cassette decks, the CT-3131 is equipped with a variety of important features. It has, an automatic-stop mechanism that functions in all modes, a running pilot light, a stereo/mono changing switch and level memory marker, along with an improved electronically controlled type DC motor. And its performance specifications are nothing but first-rate. If you've ever had doubts about the use of cassette tape  in your own stereo system, today's the day you can stop doubling. And start listening to Pioneer
The CT-3131 is designed for use with the new high performance chromium dioxide tapes, which are especially made for high frequency response and dynamic stereo sound. The unit is equiped with a chrome tape selector switch that ensures you'll get the very most from these new and different kinds of tapes.

The tape head in the CT-3131 is made of permalloy and exhibits 10 times the durability of the conventional tape head. Along with the extra long-life you can expect from this head, it also delivers extended frequency response, especially in the high ranges, from its 1,5 µ narrow gap. With these tape head improvements, you can expect sound reproduction from the CT-3131 which is the equal of many expensive reel-to-reel tape decks, and even surpasses some.
Specifications
Modes:  Compact cassette, 2-channel stereo, stere/mono
Tapes:  C-30, C-60, C-90, C-120 (standard, L. H., chrome)
Recording System: AC bias system (bias frequency 85 kHz)
Erasing System:  AC system
Recording/Playback Head:  Permalloy Solid Head with 1,5 µ gap
Motor:  Electronically controlled type DC motor
Wow and Flutter:  less than 0,13%
Signal-to-Noise Ratio:
Standard Tape :  48 dB
Chrome Tape :  50 dB
Frequency Response:
Standard Tape :  30 to 12,500 Hz
Chrome Tape :  30 to 15,000 Hz
Fast Winding Time:  within 80 sec (C-60 tape)
Inputs/Outputs
Line Input (recording line input):  50 mV/300 k Ω
Mic (microphone jack) :  0,5 mV/50 k Ω
Line Output (playback line output) :  0,775 V/50 k Ω
Phones (headphone jack) :  0,2 mW/8 Ω
Rec/P.B. (recording/playback jack) :  DIN type connector
Semiconductors:
Amplifier Section :  15 transistors; 1 thyristor; 9 diodes
Motor Section :  2 transitors; 1 diode
Power Requirements:  110-130 V/ 200-240V,  50/60 Hz
Power Consumption: 11 watts (max)
Dimensions (W x H x D):  396 x 96 x 242 mm (15-9/32" x 3-25/32" x 9-17/32")
Weight:  4,4 kg (9 lb 11 oz)