Kenwood KD 770 D Owners Manual

Page 1

KD-77OD

QUARTZ PLL DIRECT DRIVE AUTO-LlFT-UP HS TURNTABLE

The precision-engineered KD-77OD features the Kenwood ultra-rigid
DL motor and high-stability HS tonearm for outstanding music

reproduction accuracy.

Dynamic center-lock direct drive motor
Thishnprovement in the direct drive

system produces outstanding accuracy
in shaft rotation, which is virtually free
of instability. It is the source of the
KD-770Ds wow-and-flutter rating of
0.008% (Readout Direct) - an accuracy
found in few other turntables.

integrated uniblock structureivivitih
ARCB reduces vibrational energy-loss

Many turntables cause a loss in
musical energy during reproduction
through insufficient structural rigidity.
With the Kenwood DL system, it has
been possible to integrate the motor
into a solid block of AFtCB anti-
resonant resin-concrete. This in turn is
mechanically linked with the tonearm
assembly, so that the entire unit forms
one rigid integrated whole. This has
important results in terms of locational
accuracy, improved tonearm tracking
and better sound quality.

High~stability HS tonearmifor super-

accurate signal pickup

7 The tonearm assembly of the,

KD»770D is superbly engineered to
perform its task of tracking record
grooves while preventing partial
vibrations from affecting the stylus
pickup and thus degrading the signal.
The pivot bracket is a large-size diecast
span of trapezoidal form with thick
walls, designed to resist all vibrational
and torsional movement. It is coupled
to the shaft by a knifeedge base. Both
shaft and bracket in this high-stability
design have natural resonant
frequencies that are computer-
calculated to suppress the generation
of spurious partial vibrations.

High-inertia platter with inertia-lock

One of the ways the KD-7700
heightens its music reproduction
quality is with its heavy platter that
develops a moment of inertia value of
450 kg-cmz. This is more than enough
to block subtle variations in platter
rotation accuracy which are caused,
not by external vibration but by
resonance from dynamic music
signals.

The benefits of this are more evident
with digital-source records that have
wide dynamic range. Once the heavy
platter has reached precise rotation

speed, a special electronic inertialock
is activated.

High-efficiency DC motor with quartz
PLL control

The platter is driven by a high-
efficiency, high-torque, slotless and
coreless DC motor of 3~phase switch
ing plane type. This is controlled by a
quartz~referenced phaselocked loop
circuit. In order to provide the same
sort of efficiency and accuracy in
bringing the platter to a stop, an
electronic reverse-torque braking
system is employed. AII motor/platter
movement comes under the command
control of a high-integration bipolar
circuit for greater reliability.

Electronic operation and non-contact
auto-lilt-up function

As a precision instrument, the
KDY70D is designed primarily for the
manual operation often preferred by
purists. However, electronic aids to
operation are also provided, including
tonearm lift-up. At the end of the record,
lift-up is performed in total silence by a
non-contact photo-sensor mechanism.

Attractive black mirror-lacquer piano
linish

More than a functional turntable, the
Kl}77OD is also a remarkably hand-
some piece of furniture, finished with a
fine pianolike surface of dark, almost
black, simulated walnut grain veneer.

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MOTOR & TURNTABLE
Duve System
Hovor

Ywritable Platte!

Speeds V V , .
{iawaFluneL

-_'vDlE

TDNEARM
.32

we Tonearrn Length ..

rig Error .
Pressure Variable Range. .
e Cartridge Weight

ole Height Range

. Within 9/32

KD-770D

Direct Drive
Quartz PLL Careless E1 Slotless DC
Servo Motor

V I3 I33cm) Diameter, Alumnum

Alloy Die-Cast
Weight e 4.2lbs [1.9km
Starting Torque , l2 kg.cm

. Z Speeds, 3371/3 and 45 rpm.
V Less than 0.02% (WRMSl

Less than 0.008% (Readcut Direct)
DlN weighted better than 7 BOdB
DlN unweighted better than - 55dB

. StaticVBalanced Type, Straight Pipe

Arm, EIA Plugrin Connector

. 975/9" (245mm)

9715' (15mml
+13 m 71.0 degree
cm a glsms (0 lg Stew

. 2.0 to 12 glams with Supplied

Hesdshell
(7mm)

BUILHN FEATURES . Illuminated Ouanerock Indicator,
ElectronleComrullau Brake, Aim-
Height Adiustel, Anti~Skatlng
Device, Electronically Controlled
AutorLift Up Mechanism, LED
Speed Indicator, FreeStop Action
Acrylic Dust Cover, Stylus Pressure
Direct Readout Counter.

GENERAL

Power Requirement , .

Power Consumption ,.

Dimensions in H x Di. .

120V, 60Hz

ZZWzms

1975/16~ >< 64/8 X 164 (5"
I490 X162 X 410mm)

Weight (Natl ............ 25.7le I11i7kgl

SUPPLIED ACCESSORIES Low Capacitance Phono Cables WIIII
Gold-Plated Terminals, EP Adaptor,
Hexagonal Wrench, Aluminum Alloy
Die-Cast Headshell

CABINET MATERIAL ............ Particle board laminated with pianos

polished simulated walnut glam
tinish