Dual CS 731 Q Instrucciones De Manejo página 18

mains frequency nor does it need several stroboscope rings for
oe speeds and mains frequencies. It is as exact as a quartz
clock.
If the graduated marking seems to stand still, both speeds have
been set to quartz precision. By means of the speed of the apparen-
tly wandering graduation marking, the speed selected with the
pitch rotary control can be determined with extreme axactness:
1 mark/seconds correspond to a deviation of 0.9 %.
\f the graduated marking seems to be moving, the speed is higher
than the rated speed, if it appears to move contrary to the direc-
tion of rotation, the speed is slower than the rated speed.
Alignment of the tonearm setting down point
When the START button (12) is operated, the stylus automati-
cally lowers itself into the run-in groove of the record. If, in
the case of a subsequently fitted cartridge for example, the
stylus sets down too far from the run-in groove, the setting
down point of, the diamond stylus can be corrected with the
alignment screw (10).
If the stylus sets down too far inside or outside the record,
turn the alignment screw to the left or the right accordingly.
The setting is effective not only for 17 cm but also for 30 cm
records.
The platter
Quartz controlled direct drive EDS 920
For determination of the effective speed, the motor is coupled
with a multipole generator which supplies a frequency propor-
tional to the speed with great resolution. At the same time, a
highly stable frequency is produced from the quartz oscillator
via a divider circuit, which corresponds exactly to the generator
frequency at rated speed. Both frequencies are applied to a PLL
switching circuit and are compared there with each other. Even
if the record player is subjected to an additional load, for
example a record cleaner, the platter speed remains absolutely
constant
due to this phase-locked coupling of the control
electronics.
Service
Electrical safety
Technical data
Measured values = typical values.
Rumble and wow and flutter values obtained with test record.
Current type
Alternating current 50 or 60 Hz
Mains voltages 110 — 125 V and 220 — 240 V
Drive
Quartz stabilized electronic direct drive system Dual EDS 920,
PLL control
Power consumption
Approximately 4 W, motor during playing <50 mW
Platter
Non-magnetic, dynamically balanced, removable, total rotating
mass approximately 1.5 kg
Platter speeds
33 and 45 rom, switched over electronically, quartz stabilized.
PLL technology, separate quartz-exact adjustment for both
speeds, adjustment range +5.5%
Speed control
Quartz-exact, Juminous stroboscope with automatic frequency
switchover for 33 and 45 rpm
Sensitivity of the luminous stroboscope for 0.3 % speed deviation
20 division marks per minute
Wow and flutter
DIN 40.025 %
WRMS £0.015 %
Signal to noise ratio (in accordance with DIN 45 500)
Rumble unweighted signal-to-notse-ratio
Rumble weighted signal-to-noise-ratio
55 dB
78 dB
Tonearm
Distortion-free "'ultra-low-mass'', aluminum tubular tonearm in
gimbal 4 point tip bearing. :
Tonearm counterbalance with tuning anti-resonator
Effective tonearm length
Offset angle
240 4'
Tangential tracking error
0.169/cm
Tonearm bearing friction
(Referred stylus tip)
Vertical 0.07 mN (0.07 g)
Stylus pressure
Infinitely variable from 0 to 20 mN (0 - 2g), with 1 mN (0.1 g)
calibration in the range from 2 to 15 mN (0.2 - 1.59)
Cartridge holder
Removable, optimally adapted to u! tra-low-mass Cartridges, with
long holder plate (in the accessories) also suitable for cartridges
with Dual recess-type cartridge assembly and for cartridges with
1/2" attachment and an own weight of 2 to 9 g (including at-
tachment material)
Adjustable overhang: 5 mm
Cartridge
See separate data sheet
221 mm
19