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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-950 cassette deck

Yamaha claims this model K-950 cassette deck "closes the gap" between cassette tapes and discs, in terms of performance, while still providing the traditional benefits of tape, including elimination of dirt problems and uninterrupted playback of long selections. One reason for improved performance is the capability to play metal tape. Wow and flutter rated at 0,025 perceent WRMS, results from use of an independent two-motor drive system. This spec, it's pointed out, is comparable to the drive stability of a quartz-locked turntable. Frequency Response is 30 to 22,000 Hz, 3 dB, with metal tape.
The K-950 also features a pure plasma process sendust head for better frequency response and reduced dropout and modulation noise. The use of a core/coil design and silver wires substantially lowers head impedance to provide improvend square-wave response, improved linear phase response at high frequencies,, greater dynamic range and better channel separation, according to Yamaha.
Other performance and/or convenience features include; a fluorescent bar-graph peak meter to facilitate home recording; IC logic controls; continuously adjustable bias control; timer recording switch; subsonic and MPX filters. Dolby noise reduction; a focus switch to extend high-end frequency response, or to improve phase coherance.
Specifications
Track Configuration:  4-track 2-channel
Tape Speed:  4,8 cm/s ±1%
Wow and Flutter:  0,028% WRMS
Rapid  F.FWD/Rew:  75 sec. C-60 cassette
Motors
Capstan :  FG servo DC motor
Reel :  Governorless DC motor
Operation
Logic Controlled Feather Touch Operation
Full Auto Shut-Off System
Heads
2 head Recording/Playback :  pure &Plasma process head
Erase :  Ferrite head
Frequency Response Rec/Pb
LH Tape ;  30 to 17,000 Hz ±3 dB
Cr02 Tape :  30 to 19,000 Hz ±3 dB
Metal Tape :  30 to 22,000 Hz ±3 dB
Input Sensitivity.Impedance
Mic :  0,3 mV/5 k Ω
Line :  60 mV/50 k Ω
Output Level/Impedance:
Line :  340 mV/50 k Ω
Phones :  5 mW/150 Ω (1 mW)
Variable Bias Range:  ±8%
Signal-to-Noise Ratio [CrO₂]:  better than 52 dB
Overall Distortion
LH Tape :  less than 1%
CrO₂ Tape :  less than 1,5%
Metal tape :  less than 1%
Power Supplies;  120 V, 220 V - 240 V, Ac 50/60 Hz
Power Consumption:  26 W
Dimensions (W x H x D):  435 x 140 x 305 mm ( 17-1/8" x 5-1/2' x 12")
Weight:  8,8 kg ( 19,4 lbs)
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