Technics
SL-1700 Direct Drive Semi-Automatic Turntable
The SL-1700
offers the famous Technics direct drive system with the added convenience of
semi-automatic operation. Once the tonearm is manually positioned over the
lead-in grooves, the automatic mechanism will lower the tonearm onto the record
when the lever is flicked, and automatically return it to the arm rest at the
complteion of play. The unit is then
automatically shut off. This handy feature frees the user from rushing to the
turntable at the end of record play and also saves wear on your stylus. At any time during play, flicking the stop
lever will cause the tonearm to automatically lift up and return to the arm
rest.
To control the DC direct drive motor, the
Sl-1700 incorporates a B.FG servo with One Chip IC which can perform the
functions of up to 321 transistors, diodes and resistors. B.FG stands for
Back-Electromotive-Force Frequency Generator and it desribes the method whereby
the back electromotive force induced by the rotor in the stator coils is used
to monitor the speed of the platter. The waveform obtained from this becomes
the reference for the frequency generator. Its output is compared with the
standard calibration frequency obtained from the reference oscillator and then,
when needed, a correction signal instantly changes the motor drive current to
the proper value to turn the platter at precisely the right speed. Wow &
flutter for the SL-1700 is an insignificant 0,025% (WRMS), while rumble is -73
dB (DIN B).
The SL-1700
also is equipped with Technics newly designed Floating Double Isolator, which
prevents acoustic feedback by shielding the turntable and tonearm assembly from
external vibrations. This isolator actually insulates the turntable from the
outside with two layers of specially designed isolators constructed of metal
springs and special vibration absorbing material.
The SL-1700
is equipped with several other defences against acoustic feedback; a heavy zinc
alloy tonearm base, a newly designed turntable mat, and a precision made
diecast aluminum cabinet. The tonearm is gimbal suspended to achieve 7 mg
friction. Effective arm mass has been kept very low (22 g) to accommodate
premium high compliance cartridges.
Other
features of the Sl-1700 include a fine-scale direct reading anti-skating
control, illuminated stroboscope, independent pitch controls variable by up to
10%, viscous-damped cueing device, and detachable dust cover.
Specifications
SL-1700
Turntable
Section
Type: Direct drive semi-automatic turntable
Motor: Electronically controlled brushless DC motor
Turntable
Platter: Aluminum diecast , 330 mm
(13") diameter
Turntable
Speeds: 33-1/3 and 45 rpm
Speed Change
Method: Electronic change
Variable
Pitch Controls: Individual adjustment
controls, 10% adjustment range
Wow and
Flutter : 0,025% WRMS (JIS C5521) ±0,035% weighted, zero to peak (DIN 45507)
Rumble: -50 dB (DIN 45539 A); -73 dB (DIN 45539B)
Tonearm
Section
Type: Universal S-shaped tubular arm,
static-balanced type, direct-reading tracking force adjustment, with
anti-skating force control device, oil-damped cueing device
Effective
Arm lenght: 230 mm (9-1/16")
Overhang: 15 mm (19/32")
Friction: 7 mg (horizontally and vertically)
Effective
Mass: 22 g (6,0 g cartridge weight, 1,75
g stylus pressure)
Tracking
Error Angle: Within +3° (at the point of
14,5 cm or 5-45/64" record); +1°
(at the point of 5,5 cm or 3-2/16" from the centre)
Offset
Angle: 21,5°
Adjustable
Tracking Force: 0 - 3 g (direct-reading)
Cartridge
Range: 5 - 11 g
Headshell
Weight: 9,5 g
General
Power
Supply: AC 120 V - 240 V, 50/60 Hz
Power
Consumption: 6 W
Dimensions
(H x W x D): 125 x 453 x 369 mm (
4-15/16" x 17-12/16" x 14-9/16")
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