Kenwood KD 600 Brochure

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QUARTZ PLL DIRECT DRIVE TURNTABLES

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" < ; z phase-locked speed control
hined with a high-inertia platter
' , outstandingly authentic music
reproduction from records.

* High-inertia platter: 550kg- cm2
* Quartz PLL servo speed control
* ARCB limestone-resin-concrete base

Complex signal-imprinting processes that
provide records with wider dynamic range,
combined with more subtle reproduction from
a new generation of camidges, are allowing
todays record fan to be more critical of repro-
duced sound quality than ever before. Setting
the pace for the serious audiophile is the new
Kenwood KD-650/600, a turntable capable of

reproducing the most complex musical passages
with accuracy and authenticity. With its new
technology based upon transient-load theory and
its strong emphasis on resonance suppression,
the KD-650/600 turntable demonstrates once
again Kenwood engineers deep commitment

to the improvement of quality in sound
reproduction.

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TA High-Inertia Platter KD-650/600 loaded with a EiSOkg-cm2 With conventional 200kg-cm2 platter
a platter

The greater a platters moment of

inertia, the better it will resist all

external disturbances, which in-

clude fluctuations in transient

load dictated by the actual signal,

stylus-drag load, pivot bearing

friction, as well as all vibrations The KD-650/6'00s extra-heavy platter provides a high 550 kg-cm2 moment of
from the motor, transformer, inertia capable of absorbing all external influences, complemented by quartz

floor, or sound pressure waves phase-locked speed control accuracy.

generated from the speakers. With
its heavy weight of 2.6 kg (5.7 lbs)
and extremely high moment of-
inertia of 550 kg-cm2 , the platter
of the KD-650/600 is fully capa-
ble of resisting or absorbing any
external influence, and thus mini-
mizes the margin of error over
which the quartz servo speed con-
trol system has to operate. As a

result, the high-inertia Kenwood Scope traces show how Kenwoods heavier 550kg~cm2 inertia platter quickly
platter is the over-riding factor in - stabilizes after shock is given-to center shaft.

Diagram of PLL control circuit in the KD- 650/KD- 600

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F D
Frequency generater Wave shaping . Speed volt 7 , :éir , Ed"? Y0" Zero cross Drive direction
amplifier circuit converter i - £33": comparator circuit

Slill :I.Ir.'Iin1ii;

FG F'QJ"'-"r' 3""17dlt" FD F'fqptllij'y di'vllj? .F , 'fi
m : ~ 2°: Stargawew
detector , 9

fl mTmfi

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§ Crystal oscillator g j , ; ' Constant
c stal circuit 1; ,_ i , I currenicircuit
L l
, Reverse rotation Rotational Ditlerentiai
I prevention circuit dlrectlori detector SWllChlng
Lock Indicator «7 . 7 _7 %; gm

Bits

Speed switching Brake signal
STOP 33 5 circuit osclllator

Operating board

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A mechanical 780- tooth speed detector and a linear speed control signal provided by the K enwood Speed- Volt servo motor
ensure that the quartz PL L circuit maintains maximum platter rotation accuracy