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





Technics SL-10 turntable

Technics SL-10 is a compact, Quartz Direct-Drive turntable that represents a notable departure from conventional design. Although the unit has the same width and depth dimensions as an LP record jacket, it is fully automatic and plays discs in a totally sealed cabinet. A linear tracking tonearm with its drive system and a micro-computer electronic control block are contained in the lid section of the cabinet. The lower section contains a unique integral rotor platter DD motor plus its driving and quartz-phase-locked control  circuit. 
To use the SL-10, just place a record on the turntable, close the lid and press the start button. Stylus contact points are determined by a precision opto-electronic detection system. Perhaps the most amazing aspect is that the unit can be stood upright, as well as kept in the usual horizontal position, during record play. The SL-10 can also be stored in upright position, along with records, when not in use. An advanced coreless DC motor drives the arm and an optical sensor located near the stylus tip determines operation. 
The opto-electronic system utilizes deflection angle detection and is said to be far more accurate than systems that operate near the suspension. Thus cartridge/groove geometry is always maintained near the ideal relationship, says technics. There is no lateral tracking error since the SL-10's linear tracking arm has the same geometry as the cutter heads used to make records.
Specifications
Turntable Section
Type:  Quartz automatic  turntable
Drive Method:  Direct drive
Motor:  Brushless DC motor
Drive Control Method:  Quartz-phase-locked control
Turntable Platter:  Aluminum die-cast, diameter 300 mm (12 inches)
Turntable Speeds:  33-1/3 rpm and 45 rpm (auto speed select)
Speed Deviation:  within ±0,002%
Wow and Flutter:  0,012% (WRMS);  0,025% (JIS C5521) ±0,035% peak (IEC 98 A weighted)
Rumble:  -56 dB (IEC 98 A unweighted);  -78 dB (IEC 98 A weighted)
Tonearm Section
Type:  Dynamic balanced linear tracking tonearm
System:  4-pivot gimbal suspension
Effective length:  105 mm (3-21/32")
Tracking Error Angle:  within ±0,1°
Effective Mass:  9 g (including catridge)
Resonance Frequency:  12 Hz
Tonearm Drive Motor:  Coreless DC motor
Cartridge Section:
Type:  Moving Coil stereo cartridge, Coreless twin-ring coil type
Cantilever:  pure Boron pipe
Damper:  TTDD (Technics Temperature Defense Damper)
Frequency Response:  10 Hz to 60 kHz (10 Hz to 10 kHz ±0,5db)
Output Voltage:  0,2mV at 1 kHz (5 cm/s zero to peak lateral velocity )
Channel Separation:  better than 25 dB at 1 kHz
Channel Balance:  within 1 dB at 1 kHz
DC Resistance:  30 Ω
Impedance:  30 Ω pure resistance
Compliance (Dynamic):  12 x 10¯⁶ cm/dyne at 100 Hz
Vertical Tacking Angle:  20°
Stylus Pressure Range:  1,25 ±0,25 g 912,5 ±2,5 mN)
Stylus Tip:  0,2 x 0,7 mil (5 x 8 µm) Elliptical stylus , Block diamond tip
Effective Mass:  0,23 mg
Weight:  6,0 g 9cartridge only)
Replacement Cartridge:  EPS-310MC
MC Pre-preamp Section:
Rumble:  -70 dB (IHF A)
Frequency Response:  20 Hz to 20 kHz ±0,5 dB
Output level:  2,5 mV
Overall Distortion:  0,02% (connected to technics SU-70AII)
General
Power Supply:  110 - 120 / 220 - 240 V, 50 Hz or 60 Hz DC 12 V (DC input jack)
Power Consumption:  20 W  (AC); 6 W (DC)
Dimensions (W x H x D):  315 x 88 x 315 mm (12-1/2 " x 3-1/2 " x 12-1/2")
Weight; 6,5 kg (14,3 lbs)

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