Jvc Turntables 1978 Catalog

Page 1

HIGH FIDELITY
TURNTABLES

Closer to the Musical Truth

Page 2

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 thanother shafts.

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

JVC Turntable Technology ti

Center Spindle

Disc Rotor

Driving Coil

Core- Lass
DC Servomotor

Toroidal
Transformer

Edison invented the phonograph,butJVC
made it Quartz. Quartz turntable tech-
nology has become so popular it's time to
remind ourselves that JVC started it all in
1974 with the introduction of the worlds
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

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Block Diagram 0! JVC Quartz Turntable

Super Servo
FG (Frequency Generator)

1 H1 Pitch
Control

Digital Readout
Speed Counter

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-iO
through QL-A2 models in this brochure
represent the world's first full line of
Quartz turntables. Here are some of their
technical highlights.

When a voltage is applied across a thin
water 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 precision timepieces and turn-
tables. As illustrated in the block diagram
below, every JVC Quartz Turntable has a

Pitch Accuracy cl Durant Wlmorm: JVC Supu Servo FG
vs, Conventional FG

JVC Super Servo so Pitch ol aria output wavalorm is the
same as the one at next 002,35 the iesull 0' integration
Conventional FG Pitch varies oulpul by outputas the result
or lack of integration

Earnings-t:
Wadeorm rm does "at Ems.

Cnrweniional Type
Pm Chi'igts

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43W cw,

Primod Coil in the JVC SuW
Servo FG

tBO printed coils are connected In
series on the circuit board

Output mas