Jvc QL 8 Brochure

Page 1

QL-8

Like the OL-10. the OL~8 from JVC is also a
complete system combining a Quartz-Locked
Turntable, model TT-81 in this case, with the
CL-Pl Turntable Base and UA-7045 New
Gimbal Support Tonearm, the latter two being
custom-designed components available separate-
ly (in some areas) and described later.

The QL-8 with its TT-81 Quartz-Locked
Turntable section delivers the same funCtionaI
features and advanced control accuracy as the
more expensive model; it lacks only the digital
speed indicator. Features include the JVC
Quartz-Locked Servosystem, the Positive and
Negative Servocontrol, 1Hz/44OH2 Pitch Con-
trol, Quick Stop facility and more. Outstanding
performance features such as highly accurate
speed constancy, low wow and flutter, excep-
tionally high signal-to-noise ratio are all re-
tained.

Quartz-Locked Turntable

Use of the Quartz-Locked Servosystem contain-
ing a precision quartz crystal oscillator lets JVC
guarantee absolute pitch accuracy, with speed
deviation of less than 0.025%. This is a majOr
factor in your assurance of The Musical Truth
from JVC.

1H2 Step Pitch Control

With the 440Hz as the reference pitch, the
TT-81 in the (IL-8 can be adjusted higher or
lower up to 6H2 in 1H2 steps. A button control
is provided for this purpose. Unlike Other
quartz-locked servos, this one works even while
the speed is being fine-adjusted, thus speed
accuracy is always maintained.

Positive and Negative Servocontrol
The JVC servosystem works in both positive and
negative directions, again unlike conventional
systems. Any speed deviation is instantly rectifi-
ed to the absolutely correct speed.

Quick Stop

When the Stop Button is pushed, an electronic
brake produces a reverse current in the drive
circuit that generates reverse motor torque to
counteract the motor torque. The platter comes
to a full stop within one second.

Integrated Frequency Generator

A second servo, consisting of a frequency
generator for speed detection, is an integral part
of the direct-drive motor in the 0L8. A disc
rotor with 180 slits is coupled with a doughnut-
shaped magnet. Beneath this is mounted a stator
coil for detection, printed on a round-shaped
circuit board. Thus, when the motor is rotating,
180 pulses are generated with each revolution as
signals to be compared instantly with the
quartz-generated reference signal. The integrated
frequency generator, by the way. is completely
free from error regardless of loads on the
platter.

Oscillator-Assisted Stroboscope

In place of the digital indicator in the OL-10,
the OL-8 has a highly accurate strobe, illuminat-
ed by a neon lamp which flashes at a rate that is
synchronized not with power-line frequency as
in conventional Strobes but instead with the

COMPONENTS OF TT-81 DC SERVOMOTOR

Speed Detection
Magnet

StatOr Coil

Speed Detection
I Printed Coil

_Speeo
" Detection
Disc

QUARTZ-LOCKED TURNTABLE SYSTEM
\

accurate and always-stable quartz-derived refer-
ence frequency. Only one row of strobscopic
stripes is needed, and each stripe appears sharp
and clean. There is never a doubt that the
platter is turning at its correct speed.

SPECIFICATIONS
MOTOR lTT 81'
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Quick Stop Tl"ll loss than 1 sm OIIII

PLATTE R

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ACCESSORItS Oil (Lumps-(f .Irrh il"l"_
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