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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 QL-F4 turntable

Quartz Fully Automatic turntable

JVC's Core-Less Direct-Drive Motor

JVC Super Servo Frequency Generator

 

The best of both turntable worlds - platter rotational accuracy and full automatic operational ease - are included in the QL-F4. the combined use of our coreless motor plus the direct-drive mechanism and our renowned JVC Quartz technology is the secret behind the performance of the QL-F4 and its low wow and flutter of 0,025% (WRMS). We believe in this price range on the market that offers so much full automatic convenience as does the QL-F4

 

JVC Quartz for Accuracy

The QL-F4 featured the JVC Quartz servosystem which incorporates a precision Quartz oscillator JVC Super Servo Frequency Generator and responsive servo circuit, its major highlight is the JVC core-less direct0drive motor, this doesn't "cog" and thus assures absolutely smooth and accurate revolution, and leads to low wow/flutter of 0,025% (WRMS). This plus the use of simplified circuits for greater dependability, works together to give you JVC's Musical Truth.

 


Fully Automatic Mechanism

The Ql-F4 offers the convenience of fully automatic operation. Among its unusually versatile functions are;

Auto Repeat offering from 1 to 6 plays at the twist of a rotary control, with the "R" setting offering infinite replays.

Auto Lead-in, which raises the tonearm, moves it over the edge of the record, and gently lowers it to the lead-in-groove to start playing

Auto-Return which sets the tonearm automatically to its rest when a play is completed then shuts the power off. As a bonus the moment you move the tonearm manually, the QL-F4 can be operated as if originally designed for manual operation.

 

New Gimbal Support and More

Included in the Ql-F4 are, New Gimbal Support, One-Row Strobe, Oil-Damped Cueing, the knob-type Anti-Skate control,  low-resonance cabinet, etc.

Specifications

Drive System:  Direct drive

Motor:  Coreless DC type, Quartz Locked FG servomotor

Speeds:  33-⅓ and 45 rpm

Wow and Flutter:  less than 0,025% (WRMS)

Signal-to-Noise Ratio :  more than 62 dB (IEC-B);  72 dB (DIN-B)

Speed Detections:  Integrated frequency generator

Starting Torque:  more than 650 g-cm

Speed Deviation:  within 0,004%

Load Characteristics:  0% (with 100 g total tracking force)

Drift per Hour:  0,0001% /h

Power Characteristics:  0% (±10  V)

Temperature Characteristics:  0,00005% /°C

Platter:  312 mm diameter

Tonearm Type:  Tracking-Hold system, S-shaped tubular arm

Effective Length:  220 mm

Tracking Error:  +3°35' - 0°43'

Overhang:  15 mm

Tracking Force Range:  0 - 3g (0,25 g division, direct reading)

Weight Range (incl. Headshell):  14,5 - 22 g (10 g headshell)

Cartridge Type:  Moving magnet (cartridge body MD-1025)

Stylus:  0,5 mil. Diamond (DT-Z1S)

Optimum Tracking Force:  2 gramm

Output:  3 mV (1 kHz)

Frequency Response:  10 - 25,000 Hz

Separation:  more than 25 dB (1 kHz) with test record TRS-1

Load Resistance:  47 k Ω  - 100 k Ω

Compliance

Dynamic :  10 x 10¯⁶ cm/dyne

Static :  30 x 10¯⁶ cm/dyne

General Specifications

Power Requirements:  AC 110, 120, 220, 240 V 50/60 Hz

Power Consumption:  9 watts

Dimensions (W x H x D):  460 x 147 x 365 mm (with cover closed)

Weight:  6,5 kg (14,3 lbs)


 

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