Sansui AU TU 9500 Brochure

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SANS" All/109500

New studio standards in an integrated amplifier and tuner
dedicated to the art of flawless sound reproduction.

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THE PINNACLE OF PERFECTION, LESS-THAN-O.'I°/o DISTORTION
AT ANY OUTPUT LEVEL, TWIN DUAL POWER SUPPLIES
FOR PRODIGIOUS POWER

By far the most refined and advanced of
all the AU series of amplifiers. the
AU-QSOO takes the art of scund repro-
duction to a new high with its uncom-
promising emphasis on tonal quality.
operating ease. reliability and appear-
ance. Assembled with painstaking care
and with only the latest solid state cir-
cuitry, this integrated amplifier adOpts
the ultimate in amplifier design-an all-
stage direct-coupled OCL pure comple-
mentary parallel push-pull circuitry-that
delivers 75 watts per channel in conti~
nuous output :into 8 ohms. 20-
20.000Hz. both channels driven" with
total harmonic distortion of less than
0.1%. For the audiOphile who refuses
to accept second best. the AU-9500
offers a distinctive level of quality and
perfection. From Sansui. the audio
components-only specialist.

SUPERB TONAL QUALITY AND STABILI-
TY FROM T.H.D. LESS THAN 0. 3:, (5-
40.000Hz): Highly cognizant of the effect of
any form of distortion on hi-fi sound repro-
duction, Sansui has taken special care to
design the AU-QSOO so that all kinds of dis-
t0rtion are held below an imperceptible
0.1% over a super wide bandwidth. This
includes a range from the very deep lows all
the way up to the suoer highs see graphs.

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and. of course. the usual audio spectrum.
The AU-9500s power amplifier section is a
splendid example of Sansui workmanship.
Its 2-stage differential amplifier. const~
ructed of carefully selected low noise tran-
sistors. and its all-stage direct-coupled
output-capacitor-less -OCL- circuitry cam-
bine to apply stable negative feedback over
a very wide bandwidth and control all forms
of distortion. This excellence of design was
made possible by careful analyses of the
waveform of the distortion content in the
audio signal. and of the ratio of different
harmonic components in the amplifier's
total harmonic distortion - all of which
enabled Sansui to single out the odd-harmo-
nic distortion content, which most adver-

sely affects the tonal quality. and practically
do away with it. Moreover. Sansui has de-
signed a circuit system of exceptional relia-
bility. complete with thorough phase com-
pensation in each and every amplifier stage.
to achieve greater stability throughout the
amplifier, and to enhance the unit's tonal
quality when it is actually amplifying audio
signals. This circuitry system has also been
tested and proven through numerous exami-
nations. as well as careful analyses of all
data obtained isee graphsl.

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TWIN DUAL POWER SUPPLY SYSTEM
DRIVES EACH CHANNEL SEPARATELY:
The AU-9500 boasts an extremely well~re.
gulated power supply circuit constructed
around a highcapacity power transformer.
Separate winding is done for each left and
right channel and the rectifier circuit that
converts AC to DC. employs no less than
four large 4.700;:F capacitors in a twin
power supply system to supply power to
both left and right channels independently.

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In addition. the power supply for each
channel adopts a plus/minus dual supply
system that enables the OCL noutput-
capacitor-less: design. and improves the
amplifier's important damping factor.
frequency response. distortion and other
key characteristics. You'll discover. of
course. that the power transistors are

always driven with power to spare. Just as
important. another separate power supply
of higher voltage than the final stage is pro-
vided for the pre-driver. And this, plus the
fact that the drive transistors are Darlington-
connected. ensures stable power output
against load impedance fluctuations.

PARALLEL PUSH.PULL OUTPUT CIRCUIT
FOR REDUCED DISTORTION: The AU-9500
incorporates and advanced parallel push~
pull circuit for its output stage. with four
power transistors connected in parallel for
each channel. Compared with the conven-
tional push-pull output circuit. this feature
offers the advantage of requiring only half
the usual collector current for each power
transistor. This then means that transistors
can be made to operate in the region of their
current amplification characteristic where
they show excellent linearity. And since
Sansui uses only the very finest transistors