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4. Switch off
When the record has finished playing, the
record
player turns
off automatically
at
the same time the tonearm lifts itself off
from
the
record
and
the
cueing
lever
goes
into position
Y . Please
set the
tonearm
back on the tonearm
rest. We
recommend
that
after
using
the
record
player,
the
tonearm
should
be
locked
(Fig. 6).
Changing the pick-up cartridge
To take out the pick-up cartridge, unlock
the tonearm and hold it with the left
hand. With the right hand thumb, pull
down the pick-up cartridge until it snaps
out.
Mounting the pick-up cartridge.
Hold the pick-up cartridge between the
thumb and the index finger of the right
hand and slant it inside the pick-up head
so that the guide bar of the pick-up cart-
ridge sets into the wide cut-out.
Fig. 8
Speaker volume
The desired volume is set by means of the
volume control. This control is tone com-
pensated and boosts bass and treble at
low volume
settings in accordance
with
the characteristics of the human ear. Indi-
vidual adjustment of reproduction can be
set by the bass and treble controls.
Tone controls
For optimum
adjustment
of reproduction
to personal taste, the unit is equipped with
extremely effective bass and treble con-
trols. For best results, first listen with the
controls in the center positions. This will
provide linear frequency
response. Then,
depending on the volume level, raise or
lower bass and treble as desired.
Balancing the tonearm
1. With the cartridge mounted in the tone-
arm
head, turn the tracking force dial to
"On.
2. Loosen
the set-screw of the tonearm
counterbalance,
and
move
the tonearm
just to the inside of the resting post.
3. Flick the cueing lever to position X.
A light touch is all that's necessary.
4. Turning the knob counterclockwise rai-
ses the tonearm head; turning it clockwise
lowers the tonearm. The tonearm is accu-
rately balanced when the tonearm returns
to this position by itself when it is lightly
tapped.
=
<
Fig. 9
Precise balancing of the tonearm is espe-
cially important with cartridges specified
for low tracking forces.
The tonearm needs to be balanced only
once unless a cartridge of a different
weight is substituted.
Applying tracking force
With the tonearm balanced at "0", apply
tracking force by turning the calibrated
dial to the desired number. The Dual pro-
vides for applying tracking force in a con-
tinuing range from 0 to 5,5 grams. For
the correct stylus force, follow the instruc-
tions provided with the cartridge.
Service
All
lubrication
points
of the
Dual
are
supplied with sufficient oil to permit years
of operation under normal conditions. Do
not add oil at any point, as special lubri-
cants are used. If your Dual should ever
need
maintenance,
please take it to your
dealer or ask him for the name
of the
nearest authorized
Dual Service Station.
This will assure that only proper Dual
parts are used. When
shipping your Dual,
use the original packing in order to pre-
vent
damage
in transit.
If the
original
packing has been discarded, write for
special shipping instructions.
Technical data
Phonochassis
Dual record player 420
Line voltage
110/150/220 V, after resoldering
130/150/240 V (wiring diagram on the
mains transformer)
Current
alternating, 50 or 60 cycle
Fuses
at 220/240 V: 125 mA slow-blow
at 110/150 V: 250 mA slow-blow
Power consumption
approx. 25 VA
Power output
Music output 6 Watt
Frequency range
20 cps — 20 kcps + 3 dB
Signal-to-noise ratio
referred to nominal output > 60 dB
Amplifier
4-stage transistorized amplifier with non-
ferrous 6-watt push-pull output stage
Complement
1 selen rectifier
3 silicon transistors
2 germanium transistors
1 silicon diode
1 fuse 0.5 A quick for output stage
Input sensitivity
600 mV at 470 kQ
Loudspeaker
6 watt special wide-range speaker
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