Example:
desired
force
is
4-1/4
grams
1, Balance
the
tonearm
2.
Turn the washer
@
on
the
rear of
the
tonearm counterbalance until the mark is on
top.
3. Turn the counterbalance 3
full
turns
counterclockwise until the mark
is
once
again
on
top.
Check:
the tonearm,
formerly
balanced,
should
now
sink toward the rest or
the
re-
cord
surface,
4. Set the stylus
force
dial to
2-314
grams.
Anti-skating
To compensate for
skating
force,
an equal and
opposite force
must be applied to the
tone-
arm. The anti-skating
mechanism
of
the
Dual
1229 Iulfills
this
reQuirement.
The adjustment knob on
the
chassis
allows
changing the skating compensation
force even
while a
record
is
playing,
which
is
useful when
changing
from a
dry
record
surface to
one
that
has been
wetted.
Two different sets of calibrations
are
pro-
vided for
the two types
of
styli commonly
in
use today.
Red
scale:
for
spherical
(conical)
styli with
1 5
pm
tips
according
to D I N
45 50O.
White
scale: for
biradial
(elliptical)
styli with
radiuses
of 5 to 8
pm
by 18
to
22
pm.
Set the anti-skating
knob
to
the
number on
the
appropriate
scale which corresponds
to
the stylus
force
you
have set.
That
is,
for
a
stylus
force
of 1.2
grams,
set the
knob
at
"1.2".
For other
stylus tip diameters, choose
the correct anti-skating
setting
from
this
table.
Tracking
Anti-skating
compensation
force
for
stylus
radii in
microns
"p"
I
1't
"13
15
Tracking
Anti-skating compensation
force
for stylus
radii in microns
"p"
17
1e
?jl?lF?!
0,5
1,0
1,5
2r0
2,5
3,0
3,5
4,0
4,5
5,0
0,45
0,95
1,45
1,95
2,45
2,95
3,45
3,95
4,40
4,90
0,40
0,90
1,40
1,90
2,40
2,90
3,35
3,85
4,30
4,80
0,5
1,0
1,5
2,0
2,5
3,0
Fis.
17
Precise
tonearm balance
is
most
important
for cartridges
with low stylus forces. Balan-
cing need be
done
only once, unless
the
cartridge
is changed.
Setting stylus
force
Once
the tonearm is balanced, stylus
force
is
set to the
recommended value
for
the cartrid-
ge
by
turning the
stylus
force
dial.
Stylus
force can
be
set to any value
from
zero to
3
grams.
From
0
to
1.5
grams:
1 scale division
=
0.1
gram
From
1.5 to
3
grams:
1 scale division
=
O.25
gram
The
Dual
1229 is designed to
operate with
stylus
forces from
O.25
gram
up.
Every
cartridge
will
give
optimum
reproduc-
tion at
a
particular
stylus force,
See
the instruction
sheet supplied with
your
Fig
19
cartridge,
When
playing
records
wet, skating force
is
reduced
by
approximately
10
o/o.
We recom-
mend,
therefore, a
correspoÄding 10 7o
de-
crease
in anti-skating compensation.
Mode
Selector
Knob
at
"single"
(single
= normal setting
for
playing
single
re-
cords)
Knob
at "multi"
(multi
= setting
for
automatic record changer
ope rat
io
n
)
Fig.20
Through
the
"Mode
Selector"
design, the
Dual
1229
provides
a no-compromise
solu-
tion to the
problem
of
maintaining
the
correct
vertical tracking angle
during operation
as a
single-play
turntable oi
as a record changer.
When
the unit
is set
for
single-play operation,
the tonearm
is
perfectly
horizontal.
When
the
"mode"
is
changed for
changer
operation,
the entire
tonearm
assembly,
and
the
tonearm
itself
,
are
lifted by
5 mm.
ln
this way,
the unit
is
adapted
for
record
changer
operalion and
the
tracking angle
is
correct
at
the
center of
a
stack
of
6
re-
cords.
To
prevent
operation
in the wrong
mode,
changer
operation
is
possible
only
with the
Mode
Selector
in "multi".
That
is, with the
Mode
Selector
in
the
"single"
position,
a re-
cord will
not be
dropped from
the spindle,
nor
will
the tonearm
lift off
the
rest
and
onto
the
record.
Fig. 18
Too low
a
stylus
force
will
cause
distortion
in loudly
recorded
passages.
lf the
force
is
too
high, needless
wear to the stylus and
record
can
be caused.
lf stylus forces
greater
than
3
grams
are
required they can be obtained by
turning
the
counterweight, one full
turn
of
the
counter-
weight
counterclockwise
(viewed
from
front)
increases
the stylus
force
by
0.5
gram.
0,5
1,0
1,5
2,0
2,5
3,0
3,5
4,0
4,5
5,0
0,70 0,60
1,15 1,10
1,75 1,65
2,30 2,15
2,90 2,65
3,45
3,20
4J0
3,75
4,80
4,30
5,50
4,90
5,50
0,55
0,5
1
,05
1,0
1
,55
1,5
2,O5 2,0
2,55 2,5
3,05 3,0
3,55 3,5
4,10 4,O
4,60 4,5
5,15
5,0
11
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