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Dual 1225 - Tonearm Anti-skating Device

Dual 1225
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Tonearm
Anti—skating
Device
The
geommetrically
caused
skating
force
ac-
ting
on
any
tonearm
is
eliminated
to
a
lar-
ge
extent
in
the
case
of
the
Dual
1224
and
1225
by
means
of
a
precision
antiskating
de-
vice.
The
skating
force
is
dependent
on
the
tone-
arm
geometry,
on
the
stylus
force
and the
tip
radius
of
the
cartridge
stylus.
The
in-
ward
pull
of
the
tonearm
caused
by
the
skating
effect
leads
not
only
to
undesirab-
le
jumping
of
the
tonearm
when
set
down
on
the
record
but
also
unequal
forces
on
the
two
opposite
groove
walls
with
resultant
unfavourable
effects.
These
can
be
correc=
ted
with
the
aid
of
a
suitable
anti-skating
device.
By
turning
the
knob
(69)
of
the
an-
ti-skating
device
located
on
the
cover
the
asymmetrical
plate
cam
(238)
is
moved.
This
plate
cam
has
tuo
different
curvatures
which,
according
to
the
different
scales
used,
for
spherical
and
elliptical
tip
styli
and
for
CD
4
pick-up
cartridges,
move
the
skating
lever
(241)
out
of
its
position
of
rest
and
transmit
the
counter
force
to
the
tonearm
by
means
of
the
tension
spring
(256).
Skating
adjustment
is
set
at
the
works
for
conical
styli
with
a
tip
radius
of
15
+
2
um
and
for
elliptical
styli
with
measure
ments
of
5/6
and
18/22
um
and
also
for
CD
4
cartridges.
The
hexagon
nut
(239)
is
firmly
tightened
and
locked
with
paint.
Readjust-
ment
should
only
be
attempted
with
the
aid
of
the
Dual
Skate-O-Meter
and
the
L
096
test
record.
This
is
best
done
by
an
autho-
rised
Dual
service
station.
Trouble
Tonearm
head
not
located
parallel
to
plat-
ter
Cause
Shocks
incurred
during
transport
have
alte-
red
the
location
of
the
tonearm
head
on
the
tonearm
tube
Remedy
Remove
platter,
slacken
the
screw
on
the
tonearm
head
with
the
aid
of
a
screwdriver
inserted
through
the
hole
in
the
chassis
provided
for
this
purpose.
Retighten
screw
after
aligning
the
tonearm
head
(Fig.
10).
Fig.
9
Anti-skating
force
a)
Anti-skating
force
O-set-
ting.
No
compensation
of
the
skating
force
ta-
kes
place
as
a
result
of
the
action
of
the
tension
spring
at
the
fulcrum
of
the
tonearm.
Anti-skating
mechanism
set
to
“’1.5”’
on
the
scale
for
elliptical
styli.
Tone-
arm
on
tonearm
rest.
The
tension
spring
pro-
duces
the
anti-skating
force
which
is
transmit-
ted
to
the
tonearm
via
the
segment,
The
V-spring
presses
the
skating
lever
against
the
plate
cam.
b
—
c)
As
“b”
but
tonearm
abo-
ve
platter.

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Preview: Operating Instructions
Operating Instructions40 pages

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