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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-10 turntable

 

The QL-10 Quartz Turntable is a distinguished state-of-the-art. Product and JVC is proud to place it at the top of our wide line. Like the finest precision measuring apparatus, it offers a digital speed counter of unimpeachable reliability. There is a1 Hz stop pitch control to answer the needs of professional users and musicans alike, along with precision performance as represented by the 0,02% wow and flutter (WRMS) and other outstanding specifications.

JVC Quartz and Pitch Control

Only JVC Quartz technology as offered in the QL-10 can offer the incontestably unique advantage of Pitch Control in steps of a miniscule 1 Hz over a ±6 Hz range in reference to the international standard pitch of a - 440 Hz.

While other makers offer their quartz turntables with pitch control facility, ours is just about the only system to maintain that accuracy by keeping the Quartz servo in operation.

 


Digital Speed Counter

This JVC Quartz model incorporates a 4-digit LED counter to indicate the speed of the platter within .01 rpm. The indication accuracy of this built-in precision digital measuring apparatus is entirely dependable.

 

Quick Start/Stop

The platter of the QL-10 reaches an exact 33-⅓ rpm speed in less than 0,6 sec. after you push the Start button. Stop time is under one second.

Other features of the Ql-10 include:

New Gimbal Support Tonearm (height-adjustable) in a multi-layered base, cil-damped cueing, an efficient, low-hum toroidal power transformer, electronic switching, "no-cogging" core-less DC motor, and more.

 


Specifications

Type:  Coreless DC servomotor

Drive System:  Direct-drive

Speeds:  33-⅓ and 45 rpm

Speed Detection System:  Integrated Frequency Generator

Servosystem:  Quartz Servosystem

Pitch Control Range:  ±6 Hz (Standard:440 Hz)

Speed Change:  Electric switching

Start-up Time:  less than 0,6 sec

Wow and Flutter:  less than 0,02% (WRMS); 0,04% (DIN)

Signal-to-Noise Ratio better than 75 dB (DIN-B); 65 dB (IEC-B)

Start-up Torque:  better than 1,8 kg-cm

Speed Deviation:  less than 0,002%

Load Characteristics:  0% (under 120 gram loads)

Drift (hour):  0,0004%/H

Voltage Drift (±10V):  0%

Thermal Drift:  0,00003%/°C

Quick-Stop Time:  less than 1,0 sec

Platter

Type:  316 mm aluminum die-cast

Tonearm

Type:  Statically-balanced arm with New Gimbal Support on TH (Tracing Hold) System

Effective Length:  245 mm

Tracking Error:  +1°48'  -1°31'

Overhang:  15 mm

Applicable Tracking Force:  0 - 3 grams (0,25 gram steps)

Applicable cartridge Weight:  12,0 - 32,0 grams

Arm Elevation Range:  40,0 - 60,0 mm

Operation Mode:  manual

Dimensions (W x H x D):  510 x 191 x 410 mm ( 20-5/64" x 7-3/4" x 16-9/64")

Weight:  19,5 kg (42,9 lbs)


 

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