||54,500yen(around the 1972 time)
|58,000yen(around the 1973 time)
It is the belt drive player which realized the more exact rotation by the
brushless DC servo hall motor which carries the number control unit of
rotational frequency control units.
The brushless motor of a hall device application by
which Pioneer developed the process is adopted as a motor.
magnetic field of this motor is made by the electric current from the transistor
circuit committed by switching of a hall device. The attraction-of-magnet
transition to a hall device is regularly performed one by one by the magnet
rotor magnetized beforehand, and the exact rotation is obtained.
since [ which is rotated by a 10 times as much speed as a turntable ] a low
speed motor, there is little oscillation and S/N and the endurance are
improving. furthermore, the powering by a voltage stabilizer -- since a scheme,
it is not influenced by variation of supply voltage, either.
mechanism of the motor consists of a rotational frequency detecting element and
a control circuit.
Since a capacitor type detector oscillates an
alternating-current signal by rotation, a transition of a rotational frequency
changes to a transition of an oscillation signal as it is. Since this detector
is formed of the substrate attached to the rotor and stator of a motor, it also
changes very small rotation deflection to a frequency of oscillation, controls a
drive electric current, and is keeping the motor rotation constant.
33 1 / 3 or 45rpm speed switchover has adopted the electronic formula by
switchover of a circuit constant. For this reason, since it is not necessary
to hang a former type belt again, there is no trouble resulting from a
belt or its switching organization.
Moreover, 33 It has the fine-tune thumb which became
independent 1/3.45rpm, and the coordination of the rotational frequency is
enabled by ±2% of within the limits.
The polyurethane belt is adopted as
S character type is adopted as a tone arm, and the sensitivity
is improved by using the support organization of a new method for a bearing part
to it. Moreover, the head shell has also adopted the lightweight type of a hole
difference, and its flattery nature is improving sharply in addition to the
improvement in trances capacity of a tone arm.
After a stylus-force
coordination maintains balances in front and behind focusing on the supporting
point, it can be easily adjusted only by uniting the numerical character of a
wait with a Direct-reading type tick mark.
The original anti skating
organization of Pioneer in which the magnetic repulsion was applied is adopted
as the denial of an inside force. By the scheme in which a stylus-force
tick-mark numeric value shows an anti skating bias value as it is, it did not
become the obstacle of the operation for built-in [ which was included in the
interior by the main unit ], but has the outstanding endurance.
of low capacity is adopted as output code, and the damping in a super-high
region is reduced.
Rise and fall of a tone arm have adopted the
hydraulic arm elevation organization of the smooth operation by button
PC-20 which is man-month type cartridge is carried in the
The large-sized insulator is adopted and a coordination of
the degree of level is possible.
||Brushless DC servo hall motor
||The product made from diameter aluminum
alloy die-casting of 31cm (1.4kg)
||33 1 / 3 or 45rpm (a fine tune is possible)
|Rotational frequency adjustable range
||Less than ±2%, an each rotational frequency
|Rotational frequency switching
||0.05% or less (WRMS)
||55dB or more
||Static balance scheme S character type pipe arm
||man-month type (PC-20)
|An attached organization
||Arm elevation organization
Magnetic-repulsion type anti skating organization
Arm height adjustment mechanism
Plug-in system head shell
|The semiconductor used
||Transistor: 22 pieces
Diode: 15 pieces
IC: One piece
Hall device: Two pieces
||Width 498x height 201x depth of 429mm