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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





Luxman 5K50



Luxman "Laboratory Reference Series"  5K50 Exclusive Cassette tape

The development of magnetic tape has been marking remarkable progress of late, and nowadays high quality tape is made available for Hi Fi use. Various problems have been brought to light as the quality of deck is improved, in the mechanism of tape especially in correlation between deck and cassette tape. To solve such problems, LUX prepared an exclusive cassette tape having many unique features.



SKEW Adjustment Facility
This device prevents deterioration of tonal quality caused by deviation of the azimuth, improving the frequency response while maintaining the proper volume and phase balance between 2 channels. In the case of a 3 head deck, the optimum azimuth of the record head can be obtained for both A and B sides of the tape. For reproduction of the tapes recorded by other decks, adjustment of the playback azimuth is possible. The adjustment can be done by a screwdriver 9usually to be used at the click point)

Metal Tape Guide
Stainless steel is adoped for the tape quide to improve tape running stability, which contributes to realize excellent articulation of the stereo image, since minute phase-shift between the channels are reduced. With the conventional plastic guide, the articulation of image is not satisfactory because of its large friction, the alteration of friction coefficient due to the heat caused by operation, or the change of phase characteristic between the channels caused by adherence and fall-off of dust.



Wide Pad and New Holding Mechanism
A wide pad (7 mm) is employed to perfectly cover  teh record and playback heads of a combination head. The new holding mechanism using a roll spring gives constant pressure to the tape, ensuring stable azimuth against repetition of teh Play and the Stop operation.

4-Guideroller System
A new 4-guideroller system is adopted placing additional rollers in lieu of conventional plastic guide-pins, which not only prevents torque loss caused by fixed pins but offers constant back-tension.



Sensing Roller for tape Transport Time
To sense the tape running time optically, a high precision roller is featured with a reflection plate, which makes it possible to read the real time used for recording or playback with LUX decks models 5K50 and K-12.

Quality and Kinds of Tape
Top grade tape is selected for the cassettes, which remarkably reduces drop outs. To ensure the supreme performance, material of high precision make is used as shell (hub) as well as other internal components.


Specifications
Heads:
1 x ferrite Record Head
1 x sendust Playback head
1 x ferrite Erese Head
Drive Motor:
Capstan drive : 1 x Quartz Locked D. D. motor
Reel drive : 2 x Coreless motor
Tape Drive:  Dual caapstan system
Recording System:  Bridge recording by Bias Current and Signal Current
Amplifier:  DC-amp Configuration
S/N Ratio (Dolby off):
CrO₂  tape : better than 58 dB
LH tape :  better than 55 dB
S/N Ratio (Dolby on):
CrO₂  tape : better than 67 dB
LH tape :  better than 65 dB
Frequency Response:
CrO₂ Tape : 30 Hz - 18,000 Hz,  ±3 dB
LH Tape : 30 Hz - 16,000 Hz,  ±3 dB
Overall Distortion:  no more than 1,2% (LH tape, 1kHz, 0dB)
Real Analized Distortion:  no more than 0,3% (LH tape, 1kHz, 0dB)
Separation:  more than 35 dB (1kHz, 0dB)
Crosstalk:  more than -60 dB (1kHz, 0dB)
Input Sensitivity:
Line : 100 mV
Microphone : 0,25 mV (recommended impedance 600 - 10 kΩ)
DIN : 2 mV/1 kΩ
Output level:  580 mV
Headphone Output:  1 mW (8Ω)
Semiconductors Used:
Transistors : 141;
Diode : 111;
IC : 48
Power Consumption:  75 W
Dimensions (W x H x D):  442 x 132 x 362 mm (17-13/32" x 5-3/16" x 14-1/4")
Weight:  12,5 kg (27,5 lbs) net





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