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Adapting
for
other power
frequency
To
adapt
the unit
for
use
at a
different
power-line frequency
is
accomplished
by
changing
the
motor pulley
(A),
which
is
secured
to
the
motor shaft
6y a screw
and
can
be
reached
by
removing
the
turntable
platter.
Fig.21
Caution: Handle
the
motor pulley carefully.
A
bent pulley causes
rumble.
Stock
numbers
for
motor
pulleys:
For
60
Hz,
No. 220
971
for
50
Hz,
No.
220 970
Removing
the turntable platter
The platter
is
secured
by
a
C-ring
seated
in
a
notch
on
the
turntable
shaft. Use
a
screwdriver
to
remove
the C-ring, then lift
off
the
platter.
Fig
22
r
lmportant: When handling
the platter
avoid
touching
the inner
surf
aces
with
your
fingers
as
skin
oils
can
cause
slippage
(and resulting pitch
deviation)
between
the
idler
wheel
and
the
driving
rim
of
the
platter.
Adjusting
tonearm
set-down position
With
automatic
start,
the
stylus
descends
automatically
into
the outer
groove
of
the
record.
lt
is
possible, due
to
peculiarities
in
the
mounting
of a
cartridge,
that
the
stylus may land
too
far in or
too
fat
out
on the
record.
Fig.23
ln
that
case,
set the
record size
selector
for
a
12" record
(30 cm). Through
the
hole
next
to
the
tonearm rest,
you
will
see
an
adjustment
screw
@.
lf
the
stylus
lands
too
far
into
the
record,
turn
the
screw
very
slightly
to
the left;
if it
lands
too
close
to
the
edge,
turn
it
slightly
to
the
right.
Service
All
parts
that
require lubrication
are
liber-
ally
coated
with
oil.
Under normal
condi-
tions,
your
Dual
will
function
perfectly
for
years.
Do
not
oil
any parts;
special
oils
must
be
used. Should
your Dual
ever
require service, either take
it
to
your
dea-
ler
or
ask him
for
the
address
of
the
nearest authorized
Dual service
agency.
Be
sure
that
original Dual
replacement
parts
only
are
used.
Always ship
your
Dual
in its
original
packing.
Technical
data
Power
supply:
alternating,
50
or
60
cycle
changeable by changing motor
pulley
Power
supply voltage:
1101117
and
220
V
switchable
Drive:
asynchronous
pole
motor
with radial-
elastic
suspension
Power
consumption:
l0
watts
approx.
Current drain:
64 ma
approx.
at220V,50
cycle
1
15 ma
approx. at
1
17
V,
60
cycle
Turntable platter:
non-magnetic,
10s/6",
weighing
4 lbs.
dynamically
balanced
Turntable
speeds:
331/3,
45 and 78 r.p.m.
Pitch
control variation:
adjustment
range
of approx. 'l
semitone
(60Ä)
at all
three turntable
speeds
Speed accuracy deviation:
<
+
0,09%
in
accordance
to
DIN
45S07
Rumble:
>
42
dB
below signal level
in
accordance
to
DIN
45
500
Weighted
rumble:
>
57
dB
below signal level
in
accordance
to DIN
45
500
Tonearm:
torsionally rigid, all
metal design
with
vertical needle bearings, horizontal 2-layer
precision ball bearings
in hardened
and
polished
races.
Maximum
tracking error:
0.1
8o/cm
Tonearm
bearing frictions:
(referred to stylus tip)
vertical:
less than 0.01 gram
horizontal:
less than 0.04 gram
Cartridge holder:
removäble, suitable for acceptance
of
cartridges having
t1r"
mounting
and
possessing
a
weight
of
1
-B
grams.
Weight:
10.8
lbs, less pabking
Dimensions:
127/s"
x
10t/^"
Mounting cutouts:
see
installation instructions
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