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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-F61 turntable

Quartz Locked Fully-Automatic Direct-Drive Turntable.

Advanced Tonearm Design to Complement Quartz Drive System

The QL-F61 is more than just sleek, slim and solid; it's jampacked with futuristic JVC technology. One example is the advanced Double Servo Quartz control to adjust platter speed with unerring accuracy. Another is the coreless DC motor that the servo control operates; iy's brushless, coreless and cog-free. The arm is of the low-mass straight line type for better tracking. For convenience's sake, the turntable is full automatic from cue-in to end of play and shut-off.

 

Smooth platter rotation is assured by the JVC-made coreless DC motor and Double Servo Quartz control

Our ideally matched motor and servo system achieve unimaginably low wow and flutter of 0,025% (WRMS). Signal-to-Noise Ratio is better than 75 dB (DIN-B). Never again will varying pitch, however infinitesimal, mat your musical reproduction, even if the record is of the latest direct-to-disc or digital variety.

 

Low-mass straight tonearm for lighter, better tracking.

The conventional high mass tonearm cartridge combination can produce harmonic distortion on the order of 10% when tracking even a barely visible record warp. But the tonearm of the QL-F61 reduces distortion to practically nil even on moderate wsarps because of its low-mass design. Low mass means a higher resonance frequency (slightly above the warp frequency), a reduced resonance peak, and higher sensitivity. The straight contour of the arm ends spurious movement of the arm due to dynamic torsion.

 

Up-front controls for your convenience

Gone is the cluttered lok that keps you away from the controls when the dust cover is closed. Along the front edge of the QL-F61 are all the operation buttons - "touch" buttons - for record speed, pitch control, quartz on/off, repeat, record size, start/stop and  even arm cueing.

Fully automatic operation with repeat.

Operation is completely automatic from beginning of play to end; there's never any need to touch the tonearm. This is a definite plus when there are kids around who may not be particularly adept at handling the tonearm. Records and stylus are protected. When you're in the mood, switch on the repeat function and listen to the entire side of a record over and over.

 


Specifications

Type:  Quartz Locked Fully Automatic Turntable

Drive Motor:  Coreless DC servomotor

Speeds :  33-⅓ and 45 rpm

Wow And Flutter:  less than 0,025% (WRMS): 0,045 9din0

Signal-to-Noise Ratio More than 75 dB (DIN-B)

Speed Adjustment  Range:  more than ±6%

Platter:  Die-cast aluminium alloy

Diameter:  295 mm (11-5/8")

Tonearm:

Type:  Statically balanced straight tubular arm with JVC developed Tracking Hold balancing system and tracking force dial in 0,1 gram steps

Effective Arm Length:  220 mm

Tracking Error:  +3°35' - 0°43'

Overhang:  15 mm

Tracking Force Range:  0 - 3g

Weight Range:  8,5 - 12 g

Cartridge

Model:  Z-1S

Type:  Moving magnet

Stylus Tip:  0,6 mil. Diamond

Optimum Tracking Force:  1,75 x 0,25 grams (DT-Z1S)

Output:  3 mV (1 kHz)

Frequency Response:  10 to 25,000 Hz

Separation:  better than 25 dB (1 kHz)

Load Resistance:  47 k Ω  to 100 k Ω

Compliance:  30 x 10¯⁶ cm/dyne (Static); 10 x 10¯⁶ cm/dyne (Dynamic)

Power Requirements:  110, 112, 120, 220, 230, 240 V 50/60 Hz

Power Consumption: 

Dimensions (W x H x D):  420 x 115 x 355 mm (16-1/2" x 4-1/2" x 14-25/32")

Weight Net:  5,5 kg (12,1 lbs)

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