Auto-Return Quartz-PLL DC Direct-Drive Turntable
Now that you know to look for in a turntable, look at the PL-540 from Pioneer. If you've ever owned a good manual single-play turntable without automatic return, you know how desirable the latter can be - if only it doesn't compromise tone arm sensitivity.
The auto-return system in the Pl-540 doesn't harm sensitivity. If you've ever wished your turntable had the accuracy of a professional studio type - but without a studio-standard high price. The DC Hall motor and Quartz -PLL in the PL-540 deliver the same accuracy - 0,025% or less wow and fluter - as monitor turntables used in record-cutting studios. But its price is considerably less. If you've suspected that the boxy cabinet and shaky little feel on yesterday's best turntable are not enough to be called "best" today, and if the latest improvements in tone arm suspension and platter design have set you thinking about replacing your favorite noisy old faithful; look at the Pioneer Pl-540. And as you do, remember to ask for an audition of its superb tonal quality. Your ears will see that it's the turntable you've been listening for.
Our Own Quartz-PLL Servosystem
There are 200 evenly-spaced magnetic "bits" on the bottom of the rotor of the DC motor, and each has two poles; the north pole of one is opposite the south pole of the next, and so on. Then positioned below is a circular circuit board on which is a printed coil with 200 poles. A current proportional to the actual speed of the direct-drive motor is generated in the coil circuit as the magnets rotate above, and that current is sent to the PLL or Phase-Locked Loop circuit and Sampling & Hold Circuit in the servo. There phase is compared with that of an ultra-accurate reference signal from the built-in Quartz oscillator. Differences in phase if any, are converted into control voltages which in turn "tell" the motor to speed up or slow down to achieve absolutely accurate rotational accuracy in far less time than it takes your eye or ear even to begin to detect even the slightest error.
Specifications
Drive System: Quartz PLL direct-drive system
Motor: Quartz PLL Hall-motor
Speeds: 33-⅓ and 45 rpm
Wow and Flutter: no more than 0,025% (WRMS)
Signal-to-Noise Ratio: more than 73 dB (DIN-B)
Tone Arm
Type: Static-balanced S-shaped pipe arm
Effective Arm Length: 221 mm (8-11/16")
Overhang: 15,5 mm (5/8")
Usable Cartridge Wight: 4 g - 10 g
Power Requirements: 110/ 120/ 220/ 240 V 50/60 Hz
Power Consumption: 8 watts
Dimensions (W x H x D): 440 x 145 x 365 mm (17-5/16" x 5-11/16" x 14-3/8")
Weight: 10 kg (22 lb 1 oz)
No comments:
Post a Comment