Mitsubishi lt 5v brochure en

Page 2

AN IMPORTANT STEP N EARER THE ULTIMATE IN DISC REPRODUCTION-
VERTICAL LINEAR TRACKING WITH F ULL-AUT O LSI LOGIC CONTROL

Linear Tracking-A Major
Advance In Turntable
Performance

Many disc audition problems arise
because conventional tone arms
swing in an arc across the disc from a
single pivot. This innovative unit fea-
. .. _ tures linear tracking,
- _ with the stylus and
_ 7 tone arm travelling
in a straight line
. across the disc. fol-
' lowing precisely the
same path as the
head of the cutting
machine that made
the disc. The
improvement in
performance is
clearly audible. and marks a major
step forward in turntable unit design.

The linear-
tratkina tone-
arm motion

The Linear-Tracking
Mechanism

To keep the cartridge stylus always
precisely at right angles to the disc
groove, two sensitive optical sensors
detect the slightest deviation from the
proper tracking position. The unbal-
anced signal from the two sensors
actuates a servomotor that imme-
diately moves the tone-arm base the
correct distance in towards the center
of the disc. Therefore. as the groove
spirals inwards. the tone-arm assem-
bly moves across with it. This system
is so sensitive that it can respond
accurately to the dif-
ferences in the pitch
at which the groove
was cut (loud pas-
sages are cut at a
larger pitch). The
high-precision servo-
motor drives the
tone-arm assembly
via a specially
wound stainless-

, steel wire.Wire ten-
sion is kept constant
by spring loading
and the servomotor

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by a worm-type
reduction gear. This
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system holds the
tone-arm assembly
firmly in position.
unlike linear motors
where the assembly
is free to slip and
slide. The entire
tone-arm assembly
rides on a mirror-
finished high-

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nonmagnetic stainless steel. providing
stability and rigidity.

Low Tracking Error Means
Superb Trackability

Conventional tone arms have tracking
errors of several degrees. The LT-SV
tracking error is never greater than
jt0.1°, a dramatic improvement in the
ability of the stylus to trace the groove
accurately. The result is a reduction in
distortion that shows itself in better
definition of the stereo sound field and
a more realistic recreation of the origi-
nal atmosphere of the performance.
with each instrument clearly located.
All cartridges will benefit from this
improvement: the better the cartridge,
the greater the advantage.

A Short. Straight Arm with
Fewer Resonances

Conventionalrarms suffer two impor-
tant disadvantages. In order to reduce
tracking error. they have to be made
as long as possible. and they have to

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set the cartridge off at an angle to the
pipe (usually by putting an S or J
bend in the pipe). Increased length
means greater effective mass or. if a
lightweight material is used in an ef-

. fort to reduce mass.

the tone arm has a
stronger tendency to
resonate. The short.
straight arm of the
LT-SV achieves
greater strength and
reduced resonances
using a structure of
stainless steel, giv-
ing a sound that pre-
serves the full
impact of transients
and excellent defini-
. tion right down into

T-i . .. : the deep bass

The tone-arm region.
assembly

Improved Stereo Channel
Balance

Since the stylus is always at right angles
to the groove. there are effectively

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no unbalanced
forces on the
stylus. Not only
does this remove
the need for inside-
force cancellers. it also
preserves channel balance and sepa-
ration. ensuring much more faithful
reproduction.

Vertical Configuration Improves
Feedback Margins

Vibration from speaker systems can
sometimes cause acoustic feedback
to the stylus tip and serious loss of
high-level listening quality even when
it doesnt result in a continuous howl'
that prevents normal listening. The
vertical turntable configuration is
much less sensitive to feedback than
horizontal units because the vibration
from the speaker systems is at right
angles to the motion of the stylus in
tracing the groove.

Simple, Accurate Dial-Setting of
Stylus Tracking Force

The tone arm hangs vertically down.
statically balanced in all three dimen-
sions for completely stable and accu-
rate tracing of the groove. It is
therefore able to follow even warped
discs-and cope with vibrations-with
much less tendency to skip out of the
groove.

The vertical format has another
important advantage: since the weight
of the cartridge itself acts at right
angles to the tracking force. it has no
effect on it. So once the right tracking
force has been set. there is no need to
re-balance and reset it when swap-
ping cartridges! And the simple dial-
setting adjustment of tracking force
could hardly be easier to use.

Record Clamp and Stabilizer

A spring-loaded
clamp secures the
disc to the vertical
turntable. Hinging
.- _. ,- $2 completely out of
' the way for conven-
ience. it snaps into
position positively.
and applies a slight
pressure that brings
the disc into contact
with the dished turn-
table mat. It thus
acts as a disc stabil-
izer. reducing vibra-
tion and improving the crispness of
bass response. The upper edge of the
clamp has a scale that corresponds
with the scale above the tone-arm
assembly. Use these two scales to
locate any track you want to play. and
to guide the stylus precisely to the
lead-in groove.

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'Ilte balaneetl doubleflywheel

Double-Flywheel Drive System

In addition to the flywheel effect of the
turntable itself there is a second coun-
terweight flywheel. Together. they are
accurately dynamically balanced for
smooth and stable rotation. with high-
precision bearings.

Fully Electronic Auto Control

The brain of the comprehensive auto-
matic functions is an LSI computer on
a chip specially developed by Mitsubi-
shi Electric. It takes the signals from
the push-button controls and from the
photoelectric sensors that detect the
presence and size of the disc on the
turntable. and guides the stylus uner-
ringly to the lead-in goove. automati-
cally choosing 45rpm for 7 and
33rpm for 12 discs. It also enables a
number of other useful and unusual

automatic functions.

LT- 5V

Vertical L area 1" Tracking

Note that the tone arm is fully
protected from accidental contact and
the influence of air currents. etc. by
the hinged. transparent protective
cover

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Light for (Use
size detection

()ptt't'al display
and (ontrols

Auto lead-in: press the start button and the
tone arm moves to the first track on the disc.
gently lowering the stylus to commence

play.

Auto return: at the end of the disc. the tone
arm lifts and returns to its rest position.
Auto cut: play can be ended at any point
during disc audition.

Free access lead-in: the stylus can be
traversed to the left to start audition from the
track of your choice.

Auto repeat: the same disc can be repeated
as many times as you wish.

Lift-up and cueing the stylus can be
alternately raised and lowered at the touch
of a button.

Free travel: the stylus may be raised and
traversed freely to the left or right. from track
to track.

Quick response: any movement except
lift/cue of the stylus can be interrupted by a
new command.

Stylus protection: when there is no disc on
the turntable. the stylus will not descend.
and the tone arm will return to rest.

Optical Display

LED indicators show the movement of
the tone arm in real time. whether to
the left or right. and up and down.
(They cease to indicate once the sty-
lus is on the surface of the disc.)

The LED tracking error indicator
gives a quick and positive indication
of serious tracking errors. It is also
useful in checking that the arm is
hanging perfectly vertical.

Ideal for All Cartridges

No matter whether you choose one of
the latest ultrahigh-compliance moving
magnet phono cartridges. or go for the
high resolution and wide dynamic
range of the best moving coil types.
the linear-tracking tone arm of the
LT-SV will ensure that you get the very
best performance from it. Even at the
lowest of tracking forces. the complete
absence of significant unbalanced
inside forces not only gives superbly
stable tracking, it actually reveals the
individual character of the cartridge.
down to the most delicate nuances...