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-DL1 (thirty years old)


High Performance Direct-Dive in Slim Design
The SL-DL1 is divided into upper and lower cabinet halves. The tophalf, which also functions as the dust cover, contains the linear tracking tonearm, its drive mechanism and optical sensor. The lower cabinet contains the tonearm servo control system (microcomputer) and Technics original integral rotor-platter direct drive motor.

Simple basic operation. Completely automatic play.
Turn on the power, put on a record, close the top and press the start switch. After that, everything is handled by the amicrocomputer and optical sensor which automatically detect record size, select correct speed and cue the tonearm to the lead-in groove.
For non-standard record, front panel speed selectors let you select the correct speed manually (large 45s, or small 33 records ). The tonearm automatically returns to the start position after completing play. The tonearm does not move if no record is on the platter.

Complex Operation Also Possible
Although easy operation is a basic feature of this unit, complex functions are also possible. The "search" function allows start, stop switches controlled inward and outward movement of the tonearm at slow and fast speed, plus fine control in approximately 1 mm steps.

Dynamic balanced linear tracking tonearm employs optical sensor and groove deflection angle detection for extremely stable and accurate tracking.
The linear tracking tonearm moves across the record surface in the same way as the cutter head used to make the record in the first place. Therefore there is virtually no tracking error or skating force. Located by the stylus is an optical sensor that detects tracking conditions by means ofgroove deflection angle. Based on this information, tonearm movement is controlled to maintain optimum tracking at all times.

A precision DC motor is used for tonearm drive to assure quiet and accurate control
A precision DC motor and low-friction slide bearing assure accurate tonearm movement. A 4-point pivot bearing gimbal suspension developed by technics reduces riction and raises sensitivity while contributing to smooth tracking ability.


SPECIFICATIONS
Turntable Section
Type:  Automatic
Drive Method:  Direct drive
Motor: brushless DC motor
Platter:  312 mm, Aluminum die-cast
Speeds:  33 and 45 rpm
Pitch Control:  10% adjustment range
Wow and Flutter:
0,012% WRMS (measured by obtaining signal from built-in frequency generator of motor assembly)
0,025% WRMS (JIS C5521) ±0,035% peak (IEC 98A weighted)
Rumble: -56 dB (IEC 98A unweighted)
-78 dB (IEC 98A weighted)
 Tonearm Section
Type:  Dynamic balenced type, linear trcking tonearm, 4-pivot gimbal suspension
Effective Lenght:  105 mm (4")
Tracking Error Angle: Within ±0,1%
Effective Mass:  9 g (including cartridge)
Resonance Frequency:  12 Hz
Tonearm Drive Motor: DC motor
 Cartridge Section
Type:  Moving magnet stereo, one point suspension system
Magnet:  Smarium cobalt (Sm-Co)
Magnetic Circuit:  All laminated core
Frequency Response:  10 Hz to 35 kHz, 20 Hz to 10 kHz ±1 dB
Output Voltage: 
2,5 mV at 1 kHz (5 cm/s, zero to peak lateral velocity);
7 mV at 1 kHz (10 cm/s, zero to peak 45° velocity, DIN 45500)
Channel Separation:  More than 22 dB at 1 kHz
Channel Balance:  Within 1,8 dB at 1 kHz
Recommended Load Impedance:  47  kΩ - 100 kΩ
Compliance (Dynamic):  12 x 10⁶ cm/dyne at 100 Hz
Stylus Pressure Range:  1,25  ±0,25 g (12,5 ±2,5 mN)
Weight: 6,0 g
Replacement Stylus:  EPC-23CS ( equivalent EPS-23ES)
 General Section
Power Supply: 110-120/220-240 V,  50/60 Hz
Power Consumption:  17 W
Dimensions (W x H x D):  430 x 88 x 350 mm,
Max. height when top is open:  397 mm
Weight:  7,1 kg (15,7 lb)


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