Jvc Turntables Technology Catalog

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Details Do Count

Think of a turntable as a precision
instrument for the reproduction of
music. Remember that it contains
both mechanical and electrical parts.
Then consider the JVC ingenuity that
goes into every one of our high-fidelity

turntables to achieve impressive
overall performance every time over
long years of use.

We design and make all important
parts that require our critical surveil-
lance and control. The fact that we
make motor units for ourselves is
important, since every turntable we
produce is equipped with a motor
that is specifically designed for each
particular turntable for balanced per-
formance. What's more, we use ma-
chine tools. custom-designed for our
specific needs; the shafts in our
motors boast twice truer roundness
of 0.6 micron than other shafts.

This is how we know that every part
in every JVC turntable is the very best
available. That's also how we know
that when they are assembled under
our strict quality control procedures in
our modern factories, every JVC turn-
table, regardless of price. lives up to
the art of true high-fidelity reproduc-
tion. Details do count at JVC. and the
performance of each of the turntables
in this brochure proves it.

JVC Turntable Technology t

COMO! Spindle

Disc Rotor

Driving Coal

Core - Lesa
DC Servomotor

Torordal
Transformer 3

Edison invented the phonograph. but JVC
made it Quartz. Quartz turntable tech-
nology has become so popular its time to
remind ourselves that JVC started it all in
1974 with the introduction of the world's
first Quartz Turntable for consumers.
Earlier that year our studio-use Quartz
version created a sensation in profes-
sional circles. The Age of Quartz had
arrived in high fidelity.

Because platter speed accuracy is
so severely influenced by variables of
temperature. time. and mechanical in-
accuracies. the introduction of a way to
effectively avoid speed errors was a true
technological coup. The JVC Quartz
Turntable is that way.

During the past decade. motor design
made a rapid evolution from simple in-
duction, synchronous to sophisticated
servo systems. At the same time, the

Block Diagram of JVC Quartz Turntable

Super Ser vo
F 6 (Frequency Generator)

1 Hz Pitch

:Control

Drive Circuit
Power Transistor

Super Servo Control
Circuit Board

drive mechanism made a similar evolu-
tion. starting with simple rim through belt
to the now popular direct drive. JVC
Quartz. introduced most recently. is a
quantum jump over previous turntable
technology. It's no wonder that JVC is
pleased to announce that the QL-1O
through QL-A2 models in this brochure
represent the world's first full line of
Quartz turntables. Here are some of their
technical highlights.

JVC Quartz Technology

When a voltage lS applied across a thin
wafer of quartz crystal. the latter emits a
frequency so accurate that it deviates no
more than 0.004% per hour. This is why
quartz is used as an accurate reference
source in preCi3ion timepieces and turn-
tables. As illustrated in the block diagram
below. every JVC Quartz Turntable has a

Pitch Accuracy oi Output Waveform. JVC Super Servo FG
vs Conventional FG
JVC Supt! Servo FG Pitch at one output waveform IS the
same as the um: of nut one as tho: mum of integration
Conventional F6 Pifrh varies output by uulpul its the result
nl lack nl integration

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.4 1,. - v
F l .
k". g. V

Printed Cool in the JVC Super
. Servo F6
3 180 printed coals are connected in
AWE/116; series U'I the CilCull board

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JVC QUARTZ TURNTABLE

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I lncomparably Low Wow/ Flutter
(0.02%) Results from JVC Quartz
Technology

I Digital Speed Counter

I JVC Super Servo Frequency
Generator

I1 Hz Step Pitch Control
(1: 6Hz/440Hz)

The QL-lO Quartz Turntable is a distin-
guished 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 a
1Hz step pitch control to answer the needs
of professional users and musicians
alike. along with precision performance
as represented by the 0.02% wow/flutter
(WRMS) and other outstanding specifica-
tions, Ask your dealer for a thorough
demonstration of the best Quartz turn-
table by the people who made turntables
Quartz - the QL-lO from JVC.

JVC Quartz and Pitch Control

Only JVC Quartz technology as offered
in the QL-1O (and QL-8) can offer the
incontestably unique advantage of Pitch
Control in steps of a miniscule 1H2 over a
iGHz range in reference to the inter-
national standard pitch ol a'e44OHz.

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 depend-
able,

Quick Stop/Start

The platter of the QL-lO reaches an exact
33-1/3 rpm speed in less than 0.6 sec-
onds after you push the Start button. Stop
time is under one second.

Other features of the QL-lO include.
New Gimbal Support Tonearm (height-
adjustable) in a multi-Iayered base, oil-
damped cueing, an efficient, low-hum
torOidaI power transformer. electronic
swnching, "no-cogging" core-less DC
motor. and more.

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Platter Rise and Fall Response