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Sida 1/25
Dual
August
1976
Edition
721
Service
Manual
Dual
Gebrüder
Steidinger
•
7742
St.
GeorgenISchwarzwald
Download from www.dual.de
Not for commerical use
Specification
Current
Type
AC
50
-
60
Hz,
without
motor
changeover
Line
voltages
110
—
130
Volt,
220
—
240
Volt
Drive
Electronically-controlled
direct
drive
System
Dual
EDS
1000-2
Power
Consumption
approx.
2.5
Watt
Motor
during
play
<50
mW
Current
Consumption
with
220
V
50
Hz:
on
start-up
60
mA
during
play
20
mA
with
110
V
60
Hz:
on
start-up
110
mA
during
play
app.
38
mA
Run
-up
Time
(until
nominal
speed
is
reached)
2
—
2.5
sec.
on
33
1/3
rpm
Platter
Non-magnetic,
dynamically-balanced,
detachable,
1.5
kg
305
mm
Total
rotating
mass
of
drive
system
(rotor
with
platter)
3.0
kg,
moment
of
inertia
250
kp
cm
2
Platter
Speeds
33
1/3
and
45
rpm,
electronically
switchable,
automatic
tonearm
lowering
coupled
to
speed
change.
Pitch
Control
Separate
for
both
speeds,
adjustable
in
each
case
with
variable
resistor,
with
setting
scales,
range
of
adjustment
10
%.
Speed
Check
with
l
ight
stroboscope
for
platter
speed
33
1/3
rpm.
Sensitivity
of
Light
Stroboscope
for
0.1
%
Speed
Deviation
3
graduations
per
minute
at
50
Hz
3.6
graduations
per
minute
at
60
Hz
Overall
Speed
Variation
(assessed
in
accordance
with
DIN
45
507)
<±
0.03
%
Signal-to-Noise
Ratio
(in
accordance
with
DIN
45
500)
Rumble
unweighted
signal-to-noise
ratio
>
50
dB
Rumble
weighted
signal-to-noise
ratio
>
70
dB
Tonearm
Torsion
resistant,
extra
long
tubular
aluminum
tonearm
in
super
flat
universal
four-point
gimbal
suspension,
tone
-
arm
balance
weight
with
double
acting
vibration
damping
(2
anti-resonators).
Effective
Tonearm
Lenght
222
mm
Offset
Angle
25
0
20'
Tangential
Track
Error
Angle
0.16
0
/
cm
Tonearm
Bearing
Friction
(related
to
stylus
point)
Vertical
<0.07
mN
(0.007
g)
Horizontal
<
0.15
mN
(0.015g)
Tracking
Force
0
-
30
mN
(0
-
3
grams)
infinitely
variable
with
1
mN
(0.1
g)
calibrations
from
0
to
15
mN
(0
to
1.5g),
operable
from
2.5
mN
(0.259)
stylus
pressure
up.
0
-3
g
continuously
variable,
with
1/10
calibration
in
the
range
from
0
-
1.5g,
reliable
as
from
0.25
g
tracking
force
Pick
-up
Head
Detachable,
suitable
for
all
pick
-up
cartridges
with
1/2"
mounting
and
a
deadweight
of
2
-
10
g
(including
moun-
ting
material)
Adjustable
Overhang
5
mm
Pick
-up
Cartridge
See
separate
data
sheet
Weight
7.8
kg
Dimensions
and
Cutout
Required
refer
to
Installation
Instructions.
1976
2
Fig.
1
Circuit
diagram
Aug
Dual
IC1
22
n
0,7V
Strom
meßbrücke
Current
measuring
bridge
Pont
de
mesure
de
courant
• •
Ti
BD
135
20V
-
Änderungen
vorbehalten
Alterations
reserved
Sous
reserve
de
modifications
1
T2
BC
252
B
D7
ZPD
15
D
6
1
N
4001
13
14
R6
270
C
4.
1=2
50
bi
D8
ZPD
7,5
ED
Leerlaufstrom
ca.
55
mA
Icile
current
Courant
ä
vide
Anlaufstrom
255
mA
±
10
mA
Initial
current
Courant
de
demarrage
R5
130
B
R
22
100
k
(33
1/3
Upm)
C)45Unm
33
1/3
1/3
lipm
7R4
470
C
51
—
0,068
µ
D
51
BY
183
300
R
51
22
k
Gl.
1
R
52
2,7
k
C
52
—
0,047
bi
220
V
T
0,125
A
Ce
°
0-•-
R
9
100
D9
AA
143
BIM
110/130V
220/240
V
Spannungen
gemessen
mit
Meßinstrument
(7
—
10
MOhm
Eingangswiderstand)
gegen
Masse
Voltages
measured
with
measuring
instrument
(7
—
10
MOhm
input
resistance)
to
ground
Tensions
mesurees
avec
instrument
de
mesure
(7
—
10
MOhm
resistance
d'entree)
contre
masse
51
1
2
3
4
9
27
8
51
52
3
Produktspecifikationer
| Varumärke: | Dual |
| Kategori: | Inte kategoriserad |
| Modell: | 721 |
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