Dual CS 628 - Cartridge and Stylus

Ist stroboscope ring = 45 rpm for 50 Hz mains frequency
2nd stroboscope ring= 45 rpm for 60 Hz mains frequency
3rd stroboscope ring = 33 rpm for 50 Hz mains frequency
Ath stroboscope ring = 33 rom for 60 Hz mains frequency
Tunable acoustic isolators
One of the most frequent problems in turntable operation are
vibrations of various origins, being picked up by the turntable
chassis and transferred to the cartridge, which converts these
vibrations into interference signals.
To eliminate these problems, Dual's new generation of turn-
tables is equipped with tunable acoustic isolators (Fig. 6).
Interference may be caused by:
1. External vibrations. They occur when the turntable is placed
on a table or shelf in a room with wooden floor. External
vibrations, such as footsteps are transferred from the floor
to the furniture and from there to the turntable. Solution:
rotate the dial rings of the acoustic isolators clockwise (+).
2. Acoustic Feedback. A loud, howling noise will be encoun-
tered when sound waves radiated by the loudspeakers are
being picked up by the cartridge. Acoustic feedback is most
likely to occur when speakers and turntable are installed in
the same shelf. Solution: rotate the dial rings of the acoustic
isolators counterclockwise (—).
All four acoustic isolators should be adjusted by the same
amount.
This will provide optimum acoustic isolation.
Cartridge and stylus
Please refer to the enclosed data sheet supplied separately with
your unit.
Replacing the cartridge (Dual TKS...)
You may release the complete cartridge from the tonearm by
pressing the tonearm lift 13 to the rear. When doing this, firmly
grip the cartridge as it will fall off once the locking device has
been released (Fig. 7).
The tonearm lift may, however, only be moved to the rear if
you have previously removed the safety screw 14 (Fig. 8).
In order to replace the cartridge (Dual TKS...) you must
place it from below against the headshell so that the front edges
are flush. Please ensure that the cartridge lies absolutely flat on
the headshell before pulling the tonearm lift to the front in order
to lock it in position (Fig. 8). You may then, if desired, reinsert
the safety screw 14 .
Stylus
The stylus is subject to natural wear and tear during normal
playing. Therefore, we recommend you occasionally check the
stylus and, in the case of diamond styli, this should be carried
out after approximately 300 playing hours. Your specialist
dealer will be pleased to do this for you free of charge. Worn
or damaged (splintered) styli chisel the modulation from the
grooves and destroy records. Therefore, only use as replacement
the stylus types recommended in the technical data of the
cartridge. Pattern styli result in audible quality losses and in-
creased wear and tear of records. Please remember that, for
physical reasons, the stylus holder with the diamond stylus is
extremely fine and must therefore be necessarily sensitive to
impacts, shocks or uncontrolled movement.
When removing the stylus please note the information contained
on the separately enclosed data sheet referring to the cartridge
on your unit.
Fitting a cartridge
In the case of units delivered without a cartridge, or if you wish
to fit a cartridge of your own choice.
All cartridges having a total weight of 4.5 — 10 g (including the
attachment fittings) may be fitted. Units without a cartridge
are supplied with the necessary fitting accessories (also available
as special accessories under the Dual part No. 269 611 — in the
case of turntables with tuning anti-resonator — Dual part No.
266 048.
We recommend that you fit an original Dual cartridge (Dual
TKS ...), characterised by its low mass and problem-free in-
stallation. (Refer to the section ‘Replacing the cartridge
(TRS à E)
The 1/2” cartridge is fitted as follo
1)
If
necessary,
remove
the
n
(Fig.
8/14
)
2) Remove the cartridge from the headshell as described in
the section ‘‘Replacing the cartridge”
3)
Attach
the
1/2”
cartridge
to
the
mounting
plate
with
the
aid of the system installation gauge and using the acces-
sories enclosed with the cartridge. This has been correctly
installed if the tip of the stylus — viewed from above — is
in
the
V-shaped
recess
of
the
system
installation
gauge.
Viewed
from
the
side,
the
stylus
must
be
in
the
area
of
the
rectangular recess (Fig. 9).
Connect the connections of the headshell to the connecting
pins on the cartridge. The connections are color-coded:
Red R right channel
Green RG right channel ground
Blue GL left channel ground
White L left channel
5) When fitting the retaining plate with
ensure that the front edge of the bl
flush with the headshell. The metall
plate projects approx. 5 mm.
6) If the cartridge has a total weight of more than 6 g, you
must fit the additional weight included as an accessory. For
this purpose, screw the countersunk screw completely into
the additional weight and then screw this into the rear of the
tonearm counterweight.
In the case of turntables fitted with a tuning antiresonator,
screw 1 or 2 — depending on the total weight of the cartridge—
of the disc-shaped additional weights included as accesories
onto the rear of the tonearm counterweight 1.
4
he cartridge fitted,
plastic section is
c-coloured mounting
Cartridge - Total weight - Including hardware
upto 6g 1 thin disc
upto 7g 1 thick disc
upto 9g 1 thick disc and 1 thin disc
up to 10g 2 thick discs
Screw the smaller thread of the special screw into the coun-
terweight 1. With the bevelled side to the outside, screw
the corresponding additional weights onto the thicker part
of the screw.
Now once again carefully balance the tonearm as described
in the section “Balancing the tonearm” and set the stylus
pressure and anti-skating force required for your cartridge.
After having mounted a cartridge check the height of the
playing needle above the record with the cue control in
position A , also check that the needle lowers onto the run-in
groove of the record. See parts "2. Manual start” (page 10) and
“Adjustment of tonearm set-down point” (page 11).
Servicing
All the lubrication points have sufficient oil. Thus, your unit
will operate impeccably for many years under normal condi-
tions. Never try to lubricate any of the lubrication points your-
self. If your record player should ever need servicing, either
take it to your specialist dealer or ask him for the address of
the nearest authorized Dual Servicing Workshop. Please make
sure that only original Dual replacement parts are used.
Should the unit ever be dispatched, make sure that this is
packed perfectly, if possible, by using the original packaging.
Alignment of the tonearm landing point
When the START button 12 is operated, the stylus automati-
cally lowers itself into the lead-in groove of the record. If, in
the case of a subsequently fitted cartridge for example, the
stylus sets down too far from the lead-in groove, the landing
point of the diamond stylus can be corrected with the align-
ment screw 8.
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
The platter lies directly on the motor spindle and, when placed
in position, is automatically fixed through its own weight. Ad-
ditional locking is not necessary and is also not provided for.
Important! Remove the platter before transporting the unit!
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