Audio Database

Image of PL-7
Commentary

A stereo player system equipped with an automatic mechanism such as an oil dump arm elevation mechanism.

With one touch and light lever operation, this product uses an auto mechanism that simultaneously switches on/off, disengages / disengages the idler, and moves up / down the arm. This prevents the idler from being damaged or the needle from being damaged by forgetting to turn off the power, greatly reducing accidents caused by careless handling that often occur in existing players.

Equipped with an oil dump arm elevation mechanism that dumps oil on the arm rest and gently raises and lowers the arm by one touch lever operation.
Unlike a direct lifting device that uses only metal, it is dumped with oil, so smooth and accurate operation is realized.

A hysteresis synchronous motor is used for the motor to realize a drive system that is resistant to changes in voltage to the load.
In addition, an aluminum die-cast turntable of 30 cm diameter of 1.6 kg is used for the turntable.

The tone arm uses a non-resonant static balanced pipe arm that has been completed by using a unique method for processing the pivot. This arm has a main weight and a sub weight attached to the para, and the needle pressure can be read directly from the scale engraved on the shaft.
In addition, a connector type head is adopted, and any cartridge can be used.

The MM type cartridge PL-C7 is used.
By using carefully selected materials for the shape of needle tip, cantilever processing method, and damper, unnecessary resonance and split vibration are reduced.

Uses a built-in wiring method in which the lead wire cannot be seen from the tip of the arm.
A plug-jack type is used for connecting the arm and the output cord.

The needle has a unique structure that is held in a plastic holder, making it easy to replace the needle.

Aluminum die-cast panels are used to prevent the howling from being compressed.

In addition to the PL-7 that was stored in the cabinet, there was a PL-7U that was sold only in the mechanism part.

Model Rating
Type Record player
Motor 4-pole hysteresis synchronous type
Turntable 30 cm diameter aluminum die-cast 1.6 kg
Uneven rotation Not more than 0.18%
SN ratio (when using PL-C7) 40 dB or more
Tone arm Oil Dump Arm Static Balance Type with Elevation
Pipe Arm (Needle Pressure Direct Reading Type)
Cartridge MM Type (PL-C7)
Needle 0.7 mil diamond needle
Frequency characteristic 20 Hz to 21 kHz ± 2 dB
Channel isolation 20 dB or More (1 kHz)
Output voltage 5 mv (1 kHz, 50mm/s)
Output balance 2 dB or less
Impedance 2k Ω (1 kHz)
DC resistance 500 Ω
Load resistance 50k Ω
Needle tip compliance 6x10-6cm/dyne
Tracking error + / - 1 ゜
Proper needle pressure 3g ~ 4g
Range of variable needle pressure 0 ~ 4g
Exchange needle Diamond needle for stereo PL-N7 (¥ 2,400)
Pwer 100 VAC, 50Hz/60Hz Switching Type
External dimensions PL-7 : Width 526x Height 230x Depth 420 mm
PL-7U : Width 427x Height 190x Depth 346 mm