Technics SL 1310 Brochure

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SL'131 O Direct-Drive AutomaticTurntable

The direct-drive principle innovat-
ed by Technics. which has altered
the course of turntable develop-
ment. has now been carried a step
further, Not only does the SL-1310
feature fully automatic play, but

it incorporates an ingenious
redesign of the direct-drive motor
itself. The results are unprece-
dented accuracy and stability, plus
a new low-silhouette styling.

A complement to the turntable/
motor section Is the new tonearm.
Its extra~long. low-mass. low-
friction design is worthy of any
deluxe record-playing system.
With its attractively styled die-cast
aluminum base and removable
hinged acrylic dust cover. the
SL-1310 represents the ideal
combination of performance.
functional convenience and ap-
pearance.

Design Innovation: The Turntable
Becomes the Motor

In the revolutionary direct»drive
motor first introduced by Technics.
the separate turntable platter
rested directly on the rotor. On the
SL-1310. the platter is part of the
motor. In fact. it IS the rotor. And
the attractive base is no longer an
inactive element uSed only to
house the motor. The housing is
the motor stator. All together. this
simplification of parts and hard
ware gives the benefits of extreme
precision with utmost reliability
and stylishly compact appearance.
The automatic mechanism because
it is linked to this precise motor.

is also exceptionally reliable, And
finally all these characteristics can
be achieved with economy.

Efficient. Low-Power Operation
Following the success of the first
Technics direct-drive turntables,
many other manufacturers have
begun to announce direct-drive
designs of their own. However,
none has matched our high»effici-
ency energy conversion, which
results in a drastically lower figure
for power consumption-a factor
that is most important in terms of

longer life and reliability.

Less than 01 watt is consumed to
drive the turntable platter. com-
pared to AC motors that consume
100 times as much.

Total power consumption-includ-
ing circuitry. transformers and the
strobe lamp-is less than 8 watts.
The important thing is not the
saving of a few pennies of electrical
power. but the following: less heat.
less vibration; less stress on the
control circuitry and less evapora-
tion of lubricants. The result is

not merely longer motor life. which
has been achieved in other direct-
drive designs. but longer life

of the entire component assembly.

Superb Specifications

Technics means uncompromised
performance. Wow and flutter
remain at the low figure of 0.03%
W.R.M.S. (JIS C5521) that has
been associated with direct-drive
turntable performance. Rumble
figures continue to rank among
the world's finest: depending on
the system of measurement.

-50 dB (DIN 45539A). -70 dB
(DIN 455398) or -60 dB (IEC 1795).
As to long-term drift. the SL-1310

maintains below 01% error,

measured over a 30-minute period.
which is well below the drift

figure for conventional AC motors.
Normal drift for a well-controlled
AC power source is about 0.15%
per minute. Rotation accuracy

of the servo-controlled direct-drive
motor. is completely uneffected by
power-line frequency variations.

An interesting point here is that
even professional tape recorders
and disc-cutting lathes exhibit more
drift than this. The accumulated
error may easily exceed 0.6% in
commercial recordings, and may
even exceed 0.1% in the specially
cut test records used for measure-
ment of drift. In other words. if you
can detect audible pitch drift in any
record played on the SL-1310.
blame the record. not the turntable.
Drift is better than the measure-
ment capability of many fine test
set-ups.

Large, Dynamically Balanced
Platter

The turntable platter is dynamically
balanced and carefully coordinated
with the torque of the motor for
optimum performance. Thus giving
an excellent build-up of a half rota-
tion from a cold start. characteris-
tic of Technics direct-drive turn-