Technics SL-1200 User Manual

Head Shell
Cartridge
I
i
1
1 i
= 52mm (2-1/16") —>t
Fig. 5
® @ Fig. 4
Add. 4 Lift Adjustment Serew
Cueing Lever
Fig. 6
& Add. 6
fn Height Adjustment Screw
Fig. 7
Add. 7
FEATURES
(TURNTABLE SECTION)
@33.CM (13”) ULTRA-LARGE DIAMETER TURNTABLE
PLATTER
33
cm
(13)
ultra-large
diameter,
and
1.75
kg
(3.86
Ib)
heavy
weight
turntable platter has an inertial moment of 310 kg-cm? (105.9 Ib-in?)
‘and has been dynamically balanced.
‘Around the turntable platter are strobo marks which are used to
check its speed.
@DIRECT DRIVE MOTOR
There
is
no
“wow"
or
“flutter
caused
by
transmission
mechanism.
There
is
no
vibration
because
this
motor
has
no
high-speed
rotation
mechanism, The rumble is extremely low.
@ELECTRONIC COMMUTATOR BRUSHLESS DC MOTOR
The DC motor is not affected by fluctuations of the power supply
frequency. Starting rotation power is large, with complete stability of
speed reached within one-half rotation at 33-1/3 r.p.m. since there is
‘no electro-magnetic hum, the signal to noise ratio (rumble) is excellent.
‘And, because the motor includes an electronic commutator, starting
is perfectly accurate. There is, therefore, no speed instability or brush
deterioration as is often noted in brush commutators, no pulse noise
generated by brush sparking and no sound caused by rubbing of brushes.
@ROTATION OF THE TURNTABLE PLATTER CAN
BE STOPPED AT ANY TIME
This is a feature which is not found in players which have speed
reduction
and
transmissions
devices
such
as
a
belt
or
idler.
If
such
stopping
is
attempted
on
ordinary
players,
the
belt
or
idler
will
soon deteriorate and efficiency soon becomes poor. In this player
system, such stopping causes no problem other than a slight increase
of the motor current, which is not really a problem.
@ELECTRONIC STABILIZATION CONTROL
Because this set includes special circuitry to stabilize the speed electri-
cally, speed stability is extremely good.
@ELECTRICAL SPEED CHANGE
There is no mechanism to change the position of the belt or idler
There is, therefore, no “wow” or unwanted speed change.
@NO EFFECT FROM FLUCTUATIONS OF POWER
SUPPLY FREQUENCY OR VOLTAGE
Since the motor is the DC type, the rotation speed does not depend
on the power supply frequency. And, because a OC-stabilizer is used,
the
set
is
not
wffected
by
changes
of
the
power
supply
voltage,
even
if
the fluctuation is large.
@SEMI-PERMANENT HIGH PERFORMANCE
Unlike previous players, there is no reduction or transmission mecha
nism, such as a belt or idler.
‘The motor rotates the turntable platter directly at an ultra-low speed.
Wear
of
parts
is
therefore
reduced
to
the
extreme
minimum
and
high-
performance efficiency can be maintained semi-permanently,
@POWER
CONSUMPTION
IS
1/100
TH
THAT
OF
ORDINARY
MOTOR
Motor
power
consumption
is only
0.1 W. which
is less than
1/100th
that
of a conventional
AC motor.
(There
is a power
consumption
of
about
4 W, in addition
to the drive,
on other
electronic
circuitry)
(TONEARM SECTION)
@EASY BALANCING AND STYLUS PRESSURE
CONTROL
By a smooth rack-and-pinion type movement, the balance weight can
be adjusted easily. After adjusting the zero balance, pull the outside
of the stulys pressure knob outward, and the scale will be reset auto-
matically to the zero position. Now you can add the amount of stylus
Pressure you desire by directly reading the scale.
@FEATHER-TOUCH CUEING
Feather-touch cueing is viscousdamped in both directions for gentle
decent and ascent. The tonearm willbe set down exactly on the spot
you desire.

Technics SL-1200 Specifications

Turntable Section

type	Direct drive player system
turntable platter diameter	33 cm
inertial moment	310 kg-cm
turntable speeds	33.1/3 and 45 r.p.m.
motor	20 poles (rotor), 15 poles (stator) ultra low-speed brushless DC motor
power supply	AC 120V, 60Hz
wow and flutter	0.03% WRMS
rumble	-50 dB (DIN A) -70 dB (DIN B)
build-up time	1/2 rotation at 3-1/3 r.p.m.

Tonearm Section

type	EPA-120 Direct reading stylus pressure adjustment
effective length	220 mm
overhang	14 mm

Weight and Dimensions

weight	10 kg
dimensions (w x d x h)	45.3 x 36.6 x 18.0 cm