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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





JVC JL-F30 turntable

 Fully Automatic Belt-Drive Turntable
Features:
Fully automatic Lead-in, Repeat, Return and Shut-Off
Four-pole synchronous motor
Proven Belt-drive system
New gimbal support

Cost and performance. The relationship between these two factors has always been a headache to designers/engineers. At JVC our engineers tried to create -and did - a balanced turntable in the JL-F30 for any serious audiophile, using our own 4-pole synchronous motor and the proven belt-drive system. It's no surprise that it has a low wow and flutter of less than 0,06% (WRMS) and a high Signal-to-Noise Ratio  of better than 67 dB (DIN-B). With the fully automatic convenience, the JL-F30 offers more performance for less investment than other automatic on the market.

The JL-F30's fully automatic mechanism allows manual operation at any time during play. An oil-damped arm up/down lever (CUE) is provided, so that you can cue on any of the selections on a record, regardless of arranged sequences.

The 4-pole synchronous motor spins the aluminum platter through the linkage of a belt-drive system. Vibration is filtered out and speeds are kept steady against power voltage fluctuations or load changes. JVC quality control is evident throughout this unit. The unit also offers the benefits of a low-silhouette design, making it perfect for any home decor, solid cabinet construction. Parallel isolating Suspension and other features.
Specifications
Drive System:  belt drive system
Drive Motor:  4-pole synchronous motor
Speeds:  33-⅓ and 45 rpm
Wow and Fluttr:  less than 0,06%(WRMS)
Signal-to-Noise Ratio:  better than 57 dB (IEC-B) or 67  dB (DIN-B)
Platter:  die-cast aluminum alloy
Diameter:  309 mm (12-inch)
Tonearm
Type:  statically-balanced S-shaped tubular arm with JVC developed TH balancing system and with tracking force dial of 0,5 g/steps
Effective Arm Length:  220 mm
Tracking Error:  +3°35'; -0°43'
Overhang:  15 mm
Applicable Tracking Force range:  0,5 to 3 grams
Mountable Cartridge:  14,5 - 22,5 g (including Headshell)
Cartridge
Type:  Moving magnet MD-1025
Stylus:  0,5 mil diamond for DT-Z1S
Optimum Tracking Force:  1,5 to 2,0 grams (DT-Z1S)
Output:  3 mV (1 kHz)
Frequency Response:  10 to 25,000 Hz (DT-Z1S)
Separation:  better than 25 dB (1 kHz)
Load Resistance:  47 to 100 k Ω
Compliance:  25 x 10¯⁶cm/dyne (Static); 10 x 10¯⁶cm/dyne (Dynamic)
General
Power Source:  120, 220, 240 V 50/60 Hz
Power Consumption:  13 watts
Dimensions (W x H x D):  460 x 368 x 130 mm (18-1/8 x 14-1/2 x 5-1/8 inch)
Weight:  7 kg (15,4 lbs)

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