Pioneer sx 850 brochure

Page 1

XHDPIONEER I..- ---l.;mmm...;--.

A High Power AM/F M Stereo Receiver with Super-Quiet Phono Equalizer
and Outstanding FM Selectivity/Sensitivity.

How do you know when to trust a
stereo receiver to fill your muaicai
neede? Power output by ltull is not
much help. because unleea your
listening room It the size at a con-
cert hall. a receiver with lar leee than
concert-haIi-aized output will do
nicely. The anewer. obviouely. to to
put your trust In the circuitry-the
kind that you'll enloy in the Rioneer
sx-sso. It delivers a continuous
power output of 65 watts per
i . channel. min. RMS at Bohms.

V tom 20 to 20,000 Hertz. with no

more than 0.1% total harmonic
dlstortlon. But even more impor-
tantly. it has the atrength and ilneeae
to handle that power with a healthy
reepect tor musicality. The Sit-850
has a euper-quiet phono equalizer
in a avatage direct-counted design
to achieve wide dynamic range and
3:0.2dBRiAAequallzettonaccuracy.
An PET in the Tone control section.
plue a 2-step irequency turnover
awltch tor BASS end another tor
TREBLE, 2-declt monitor/dubbing.
2-ayetem speaker drive. separable

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pre/maln and more. mean iurther
control versatility. The superb Flll
AM section Iran a duel-gate M08
PET and a e-gang variable capacitor
to booet sensitivity and selectivity. a
PLL it: in the multiplex to Improve
atareo separatlon. and a special
integrated Circuit in the AM tor still
better reception and tau nolee. We
the Pioneer sx-eso-iho one you
can trust to keep iatth with your
musical needs.

Page 2

Sax-850

PHONO EOUALIZEH OFFERS WIDE
DVNAMICRANGEAND $0.2dBRIAAEO.
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Because the plus/minus split power
supply delivers a high voltage (+25W
-rev) at all times to the circuit. the
phone equalizer in the Pioneer SX»850
features an extended phono overload of
200mv (1kHz. THO 0.1%) against its
Input sensitivity ol 2.5mV. This assures
sutlicient dynamic margin to reproduce
the very wide dynamic range available
in today's records. and to do so with
absolute minimal distortion even when
large output cartridges are employed.
The equalizer circuit has a 3-stage
direct-coupled design using a one-stage
PNP to achieve high gain ampliilcatlon.
Distortion is kept low by applying suiti-
ciant negative leedback. Since the pre-
cision elements used permit reproduc-
tion within $0.2d8 ot the RIM curve.
unwanted coloration is avoided and a
near-pertect llat traquency response ls
achieved.

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TONE CONTROL PET MINIIIIZES
NOISE

Pioneer takes maximum advantage at
up-to-date circuitry by using an FET
(Field Ellect Transistor) in the tirst stage
at the "at amplifier in the tone control
section. When volume is altered. no
additional noise occurs.

TONE CONTROL 2-STEP TURNOVENS
FOR BASS AND TREBLE

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An independent turnover trequency
selector switch is provided tor each oi
the tone controls. BASS turnover is
either 200M: or 400m: TREBLE turnover
is either'2.5l;Hz or 5101:. depending on
your selection. A third switch. TONE
ONIOFF. is provided to bypass the tone
control circuit instantly to provide liat
(uncolored) reproduction without chang-
ing tone control settings.

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LOW/HIGH FILTERS

The filters in the SX-BSO are designed to
cut noise in the low and high ranges
without harming too much ol musical
content. For this reason they have sharp
cut-oil characteristics (6dB/oct.). Cut-
ott is 30H: and below tor Low and Skill
and above lor High.

POWER AMPLIFIER DELIVEHS
CLEAN 85 WATTS (HMS) PER
CHANNEL WITH LOW DISTOHTION
AND HIGH SIN

The all-stage direct-coupled OCL circuit
In the Pioneer sx-aso delivers a con-
tinuous power output at 65watts' per
channel. min. RMS at 8 ohms. iron
20 to 20.000 Hertz. with no more
than 0.1% total harmonic distortion.
The circuit has a remarkably good
slgnal-to-nolse ratio.and features a [irat-
stage PNP diiterential amplltler which
makes available suliicient negative
teedbsck to lower distortion. suppres
voltage fluctuations introduced by out.
side iactors. and increase stability tor
better musical reproduction.A constant-
current dillerential amplification pre-
driver enables the reproduction ol
massive low-trequency signals by elimi-
nating the time constant in the low
range. Power transistors per channel)
in the output stage are connected in
parallel. dividing the current required by
halt. to take advantage ot increased
linearity. improve heat-dissipation elli-
ciency. and provide a large and steady
power reserve trom the lows through
the super-highs. Since the output stage
is the singleatndedmush-pull typo.even-
numbered harmonics are eliminated and
a wide margin is maintained tor low-
distortion output.

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'Mealured pursuant to the Federal Trade Comm