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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





Yamaha K-142 cassette deck

K-142 Features:
Double cassette deck
Relay play
Permalloy R/P heads
Dolby B NR
LED peak level meter
Cue/review
Auto tape selector
Timer rec/play

Our most affordable double-cassette deck, the K-142 mainatins the high standard of reproduction quality demanded at yamaha. A shining example of versatility, styling, and intelligent design, the K-142 offers features found in our most expensive cassette decks - at an affordable price. A yamaha hard permalloy head, with its excellent frequency response, low distortion, and wear resistance, assures superb performance in both record and Playback modes. Dolby B Noise Reduction, an industry standard, eliminates unwanted tape hiss and extraneous noise, and ensures optimum performance with all tape types.
The K-142 is an amalgam of features designed for increased listening pleasure and convenience. In fact, it may be the most easy-to-use cassette deck available. Relay play automatically starts Deck B after Deck A has finished playback. One-Touch Dubbing makes tape copying from one deck to another easier than ever. Cue and Review permits fast, easy location of recorded segments on your tape. One-Touch recording starts with a gentle touch of the Rec button (Deck A). An Auto Tape Selector, Timer Rec/Play, and Independent R/R Record Level controls complete this fine component.
As a complement to your present stereo system, or as the heart of your audio system, the K-142 Natural Sound Double Cassette Deck is an ideal component.
Specifications:
Track Configuration:  4-track, 2 channel stereo
Motors:
2 x DC servo motor for Capstan
2 x DC motor for reel
Heads: 
2 x Permalloy rec/playback
2 x Double gap ferrite erase
Wow And Flutter
No more than 0,08% (WRMS)
No more than ±0,15% ( W peak)
Fast Winding Time:  110 sec.
Signal-to-Noise Ratio:
Dolby off ;  better than 58 dB
Dolby  B on :  better than 66 dB
Frequency Response (-20 dB)
Normal tape :  30 - 15,000 Hz ±3 dB
CrO₂ Tape ;  30 - 15,000 Hz ±3 dB
Metal Tape ;  30 - 16,000 Hz ±3 dB
Total Harmonic Distortion: no more than 1%
Channel Separation:  better than 40 dB
Crosstalk:  better than 55 dB
Input Sensitivity/Impedance:
Line :  50 mV/50 k Ω
Output level:
Line :  360 mV/1,2 k Ω
Phones :  0,1 mV/8 k Ω
Dimensions (W x H x D):  435 x 127 x 225 mm (17-1/8" x 5" x 8-7/8")
Weight:  4 kg (8 lb 13 oz)
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