Pioneer PL-350
¥ 49,800 (around 1979)
Commentary
A full auto player with a quartz PLL DC servo hole motor.
Equipped with a full auto mechanism.
The PL 350 uses a 2-motor type full auto mechanism with a dedicated motor for auto operation of the arm. This realizes smooth auto operation without adversely affecting the rotational accuracy of the turntable. Also, if you set the size selector to the manual position, you can quickly listen to only the songs you like.
When the recording is finished, the arm automatically returns to rest.
A newly developed coaxial suspension system has been adopted for the cabinet.
In this system, the motor and arm are fixed to the underboard, and spring support is provided for the underboard to minimize the influence of external vibration.
A high-torque quartz PLL brushless DC servo hole motor is used as the drive motor.
The servo mechanism uses a quartz PLL to control the phase difference by applying the reference signal of the crystal oscillator. The speed detection mechanism of the motor itself uses a method in which the AC signal obtained by the print pattern coil with the same number of poles attached facing the 200 pole magnetized on the whole circumference of the rotor magnet bottom surface is integrated on the whole circumference to improve the accuracy.
In addition, Pioneer's unique Hall element is used for changing the magnetic pole of the monoter, and the reliability of the drive unit as a whole is thoroughly pursued.
The tone arm uses a mass-concentrated S-shaped arm that moves the main weight closer to the rotating shaft and provides vibration isolation measures. This reduces the moment of inertia of the arm and provides high traceability even when using a high-compliance cartridge.
MM type cartridge is equipped as standard.
Front operation system is adopted, and arm operation (auto lead-in, auto cut, Oatley peat) can be performed with the acrylic cover closed.
Model Rating
| Type | Record player |
| Phono Motor Section | |
| Motor | Quartz PLL brushless Hall motor |
| Drive system | Direct drive |
| Turntable | 33 cm Aluminum Die Cast |
| Inertial mass | 300kg-cm2 |
| Number of revolutions | 33 1/3, 45 rpm |
| Uneven rotation | 0.025% or less (WRMS) |
| S/N | 75 dB or more (DIN-B) 63 dB or More (JIS) |
| Load variation | 0% (Needle Pressure 200g or Less) |
| Start-up characteristic | 1/3 turn or less |
| Starting torque | 1.3 kg / cm |
| Rotational speed deviation | Not more than 0.002% |
| Drift | Time drift : 0.00008% / h Temperature drift : 0.00003% / ° C. |
| Tone Arm Section | |
| Type | Static balance S-shaped pipe arm |
| Effective length | 221mm |
| Overhang | 15.5mm |
| Applicable Cartridge Dead Weight | 4g ~ 9g |
| Head shell | Glass fiber-reinforced resin |
| Cartridge Section | |
| Type | MM Type |
| Needle tip | 0.5 mil diamond needle |
| Exchange needle | PN-150 |
| Output voltage | 3.5 mv (1 khz, 50mm/sec. horizontal) |
| Load resistance | 30k Ω ~ 100k Ω |
| Appropriate load resistance and load capacity | 47k Ω + 170 pf |
| Proper needle pressure | 2.2g +0.3 -0.5g |
| Frequency characteristic | 15 Hz to 30 kHz |
| <Others> | |
| Auto function | Full Auto with Dedicated Motor |
| Attachment mechanism | Auto lead in Auto return Autocut Autorepeat Anti-skating Arm elevation Strobe light lamp Free stop hinge Needle pressure direct reading weight |
| Semiconductors used | Crystal x1 ICx3 Hall element x3 Transistor x3 3 diodes |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 8.5W |
| External dimensions | Width 440x Height 140x Depth 385 mm |
| Weight | 9.1kg |