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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





Pioneer PL-12

 A high fidelity turntable featuring simple, fool-proof operation.
The easy-operation PL-12 stereophonic turntable combines all the quality features you need for true hi-fi disc reproduction - the finest hysteresis synchronous motor 9eliminating audible wow and flutter), and an extremely steady, reliable belt-drive. Plus an improved head-shell that allows for easy cartridge changing, an oil-damped tonearm elevator that treats your records ever so gently, operated by a simple lever that raises and lowers the beautifully balanced tonearm. Simple selection of either 33 ⅓ or 45 rmp, too. The PL-12, despite its modest price, is a very satisfying component indeed.
 Hysteresis Synchronous Motor
The Model PL-12 achieves a very high standard of performance despite its surprisingly modest cost. It does this through the use of high quality parts such as the vitally important motor. In the PL-12, it is a hysteresis synchronous type, the only kind free from line voltage fluctuations, with the result that turntable revolution is always rock-steady. Correct musical pitch is ensured. This type of motor is also quietest in operation.

Belt-Drive
There are several ways to convey the revolutions of the motor to the turntable - among these the belt-drive is recognized as the best. The PL-12 employs a long-lasting polyurethane belt that further contributes to the steady, reliable performance of the turntable platter.
 Cartridge
The PL-12 includes a moving magnet cartridge, the PC-11. it faithfully reproduces a frequency range from 15 to 20,000 Hz. Stereo separation is excellent, with distortion-free, clean sound. Like more expensive models, it allows for easy changing of the stylus, the cartridge, even the cartridge shell itself. Simple adjustment of the overhang is also possible.

The Utmost Ease of Operation
One of the best qualities of the PL-12 is its truly easy operation. A simple 2-position switch on the right gently raises and lowers the tonearm, and a simple 2-position switch on the left lets you choose either 33 ⅓ or 45 rpm. The PL-12 is that rarity in the audio world - a true high fidelity unit that even a child can operate with complete safety.
Specification
Motor:  4-pole hysteresis synchronous motor
Drive System:  Belt-driven
Speed:  33 ⅓ and 45 rpm
Turntable Platter:  12" aluminium alloy die-cast turntable
Signal-to-Noise Ratio:  better than 45 dB
Wow and Flutter:  less than 0,12% (WRMS)
Tonearm:  Static-balanced type
Cartridge:  PC-11 (moving magnet Type)
Stylus:  PN-11 (0,6 mil dimond)
Frequency Response:  15 - 20,000 Hz
Separation:  better than 25 dB (1 kHz)
Load Impedance:  50 - 100 k Ω (1 kHz)
Compliance:  10 x 10¯³ cm/dyne (100 Hz)
Stylus Pressure:  2,5 to 3,5 grams
Output Voltage:  5 mV (1 kHz, 50 mm/sec.)
Power Requirements:  110 - 130 V, 220 - 240 V, AC 50/60 Hz
Power Consumption:  18,5 VA (12 W)
Dimensions (W x H x D):  431 x 153 x 341 mm (17" x 6" x 13 ½")
Weight:  6,1 kg (13,4 lbs)
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