||LT-5V:69,800yen(around the 1979 time)
|LT-5VC:79,800yen(around the 1979 time)
It is a record player of the length type type which adopted the linear
There were two kinds of LT-5VC which
equipped LT-5V and Diatone original cartridge MM-2 by an alt. phone company a
cartridge is not attached to.
A length type structure new as a record
player is adopted as LT-5V.
In a common level type player, since the
direction of floor vibration is the same as the oscillating direction of a
cartridge, when changing the mechanical vibration by trace of a sound track into
an electrical signal by a cartridge, floor vibration will be compounded by the
play signal and it becomes a howling phenomenon.
On the other hand, in the
length type player, the oscillating direction for the direction and cartridge of
floor vibration to generate electricity does not interfere, but it has a
structure strong against howling.
Moreover, the impression system is adopted as needle pressure. Since the
tare direction of a cartridge differs from the needle pressure direction,
once it sets it as proper needle pressure, even if it exchanges cartridges,
there is almost no troublesomeness of needle pressure readjustment.
The linear tracking
system is adopted as a tone arm part. By this system, in order to carry out
horizontal displacement of the tone arm the whole fulcrum, it becomes the
completely same operation as the cutting machine which minces a sound track to
record original recording.
It consists of two, the optical sensor part
which detects the degree of perpendicularity of a tone arm, and the actuator
which operates a tone arm based on the instructions from a tracking servo
circuit, LT-5V. First, the optical sensor has detected the degree of
perpendicularity of the tone arm part currently supported in the gravity
direction (lower part), and a base portion from the arm base, and the system
which tells the output which takes place according to the angle difference to a
tracking servo circuit is adopted. The motor for a level drive is correctly
rotated by the tracking servo circuit which had an optical sensor which reacts
quickly, and high accuracy also in few angle differences.
The optical sensor
has the structure of detecting the degree of perpendicularity of a tone arm in
engineering, by the output of 2 sets of high sensitivity photo-couplers.
In the tone arm, the short & straight type stainless steel arm is
adopted, and in high rigidity, since inertial mass is also low, the partial
vibration and the compound vibration have decreased.
The record holder
is equipped with the special stopper which combined the spring in order to make a turntable hold a record board certainly. Furthermore, the device is added also
to the form of the center shaft connected with this stopper.
Moreover, it is possible to also support a record with curvature firmly
by making a turntable sheet into the shape of an earthenware mortar slightly.
The double flywheel
drive system is adopted as the drive of a turntable. A moment of inertia is
raised combining a flywheel at the back of a turntable, and it is made to drive
by PLL and a DC servo motor by this system.
Furthermore, stable rotation is
realized by carrying out balance adjustment to one-piece one-piece high
precision by a balancing machine.
The optical sensing logic control by
LSI which the Diatone developed is adopted as a full auto mechanism.
light first irradiated from the reflector makes the sensor corresponding to each
record size react by a record size automatic detection mechanism. Next, the
output from a sensor is sent to a logic circuit. This detected record size automatically, and also the needle descent position at the time of a performance
start, the end position of a performance, and number of rotations are also
Moreover, the needle point protection function is carried, and
when the record board is not set on the turntable, even if it pushes a manual
operation button accidentally, a needle returns to a turntable to an arm rest as
it is, without getting down.
The muting function which cuts the unpleasant clicking noise at the time
of a record landing is carried.
The optical display which displays a motion of a tone arm on real time by LED is carried.
The tracking monitor is carried in order to check the degree of
perpendicularity of a tone arm. When a tracking error occurs, it catches
quickly, and warning is emitted by LED.
||Electronic-control full auto player
||Double flywheel belt drive system
||PLL and a DC servo motor
||The product made from 304mm aluminum alloy
|Number of rotations
||33 1 / 3 or 45rpm
|Number-of-rotations change system
||Electronic formula (irregular number of
rotations is a manual change)
|Number-of-rotations fine-tune range
|Wow and flutter
||0.045% or less (WRMS)
|Signal to noise ratio
||65dB or more (IEC-B)
76dB or more
|<Tone arm part>
||A static balance type and a universal
|Tracking error angle
|Needle pressure adjustment
||Direct-reading types 0-2.5 g (0.1g step)
||LT-5V: Glass fiber ON special resin, 6.2g
LT-5VC: A cartridge and an integral type (MM-2)
|Cartridge attachment weight range
||Particle board metallic finishing
||Styrene resin (attachment and detachment are
||It builds in the leg.
||Width 466x height 430x depth of 200mm
45 times diversion adapter