Dual 420 - Technical Specifications; Technical Data Summary; Pick-up Cartridge Handling; Stylus Replacement Guide

Additional
information
sheet
for the
operating
manual
This unit is equipped
with the Dual stereo
ceramic
pick-up
cartridge CDS 650,
which can be supplied
ex factory
with
one of
the following styli:
DN
6: 2
x
0.6
mil
sapphire
needle
for microgroove and stereo records
DN
65: 0.6
mil diamond needle
for microgroove and stereo
records
DN
66: 0.6
mil sapphire needle
for microgroove and stereo records
Stylus
type
(e.
g.
DN 6)
is shown on
needle holder.
To
place
the stylus request in
playing position,
turn needle
by
180
o.
Dual
42O
Technical
data
Recommended
stylus
pressu
re:
Frequency range:
Output:
Output difference
between channels:
lsolation between
channels:
Compliance:
AC
resistance:
Net weight:
4
s
(3,5-4,5 g)
20 c
p.s.
to 16 k.c.p.s.
Minimum 65 mV/
1 cÄ/sec
per
channel at 1 k.c.p.s.
(1
M A/200
pF)
Maximum 2 dB at 1 k.c.p.s.
Approx. 22 dB al 1 k.c.p.s.
Horizontal 6 x 10-6 cm/dyn
Vertical
4,5 x 10-r cm/dyn
per
crystal element
approx.
160 kQ
at 1,000 c.p.s.
3,8
g
Changing
the
pick-up
cartridge
To take out the
pick-up
cartridge, un-
lock 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
Fig. 2
Hold
the
pick-up
cartridge
between
the thumb and
the index finger
of the
right
hand and slanting it
inside
the
pick-up
head
so
that the
guide
bar
(A)
of
the
pick-up
cartridge sets into the
wide cut-out
(B)
(Fig.
3).
The novel snap-on mounting of this
pick-up
cariridge on the tonearm elimi-
nates all mounting hardware. The snap-
on mounting secures
perfect geometri-
cal alignment of the stylus
tip.
Attention
!
The needle
holder should be remo-
ved
from the cartridge
before moun-
ting or removing it
from the cartridge
holder.
Changing the stylus
After having removed the
pick-up
car-
tridge, turn the needle bearing by 90o
as
shown
in f ig. 4. Now the
needle can
be changed
quite
easily.
lnsert
the needle in the same
position
and make sure
that the needle
holder
is
properly
seated in
the cut-outs of
the cartridge.
CDS
650
Stereo
trequeocy
respsse, cut-oft
resistGe
Me6urinq record OlN4551l,
DG recordtng
curve
:
OlNa5547,
stylus
force
49.,record
ployer,Duql 12
0dB=min
65mV/cris'rot
451
cutting ongle
.
20'C
--->
t lHzl
Crosstolk
6
meosured with test
record
DlN4551l.
derived from
tronsmitted
voltoge
4
6810'?
2 4 68t0" 2
4 6 810' 2 1
6 8lo'
Fig. 4