Pioneer SX-980 Руководство по эксплуатации - Страница 2
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FEATURES
Power Amplifier for a Continuous Power Output
of 80
Watts
Per Channel
and
for Ultra-Stable
Sound Reproduction
@ The adoption of a single-stage differential amplifier with
low-noise
dua!
transistors,
pre-driver stage a current
mirror
load
and
an
SEPP
circuit provides a bumper
power output of 80 watts + 80 watts( continuous
power
output of 80 watts"
per channel,
min., at 8 ohms from 20 Hertz to 20,000
Hertz with no more than 0.05% total har-
monic
distortion)
which is extremely stable. These
features also guarantee
a stable operation at all times
from low outputs to high outputs.
@ The power amplifier is configured as a DC power ampli-
fier with the capacitors removed from the NFB circuit
for a flat gain response all the way from the lowest of
the low frequencies up to the audio frequencies. At the
same
time, the design is engineered for low distortion
with
the
incorporation
of
newly
developed
power
transistors.
@ The large-sized transformer
with
its superb regulation
employ two 18,000uF large-capacity electrolytic capaci-
tors in the power supply and permit high sound quality
even at lowest frequencies.
IC-Based FM Tuner with High Selectivity, High S/N
and Low Distortion
®
The FM front end incorporates a 1-stage RF circuit that
employs
a 4-gang
tuning
capacitor
and
a dual-gate
MOS
FET
for high gain and
low noise. This config-
uration
excels
in ridding
the
sound
of undesirable
interference
for
impressive
statistics:
1.7uV
(IHF)
sensitivity,
more
than
100dB
spurious response
ratio
and more than 90dB image response ratio.
@
The FM IF amplifier combines three dual-element phase-
linear
ceramic
filters
with
two
IC's
which
contain
quadrature detectors for a high selectivity (80dB) and a
low distortion (MONO:
0.1% at 1kHz).
@
The stereo demodulator employs an NFB-type PLL MPX
IC with a automatic pilot canceller which automatically
cancels
out
the
pilot signals
without
reducing
the
high-end
frequency.
This means
that the leak carrier
level is amply suppressed for a tip-top separation and flat
frequency response in the reproduction frequency band.
AM Tuner Includes Newly Developed !C
The
tuned
AM
RF
amplifier
circuit
incorporates
a
newly
developed
high-sensitivity,
low-distortion
IC and
2-gang variable
capacitor. These contribute to enhanced
imaging and
RF interference
rejection capabilities. Since
the
optimum
AGC
voltage
is supplied to each section,
2
stable reception can be obtained with low spurious inter-
ference and distortion even in high field strength areas.
Precise Record Equalization
e@ A balanced power supply is used in the equalizer ampli-
fier to obtain a maximum allowable input of 200mVrms
(1kHz).
Low
distortion
record
playback
can thus be
enjoyed
even
with high output phono
cartridges and
music sources containing large peak signals.
@ The equalizer elements which are designed to produce
the RIAA characteristics use high-precision parts to keep
the equalizer deviation between 20Hz — 20kHz down to
+0.2dB
for faithful sound
reproduction from records.
Other Features
TURNOVER
switches:
These switches yield variations in
the curves of the tone controls when they are operated in
conjunction with the other bass and treble tone controls.
One
is used
for the bass and the other for the treble,
thereby allowing plenty of variation in tone control adjust-
ment.
Highly
reliable protection
circuitry:
In order to protect
the speakers and the power transistors, this receiver features
a newly developed protection IC as well as a special muting
circuit that cuts out the noise produced
by the on/off
operation of the power switch. Needless to say, these are
very dependable and stable protection circuits. In addition,
there
is an inrush current suppressor circuit which
sup-
presses surges of current when the power is switched on.
FM 25us switch: The receiver's front panel is equipped
with a de-emphasis selector switch which is useful when the
receiver is tuned into an FM Dolby
station. This facilitates
operation when the receiver is set up for the reception of
an FM Dolby broadcast.
TAPE
DUPLICATE
switch: This switch allows you to use
two tape decks to edit or duplicate material recorded on
one tape to another. Duplication from an open-reel deck to
a cassette
deck,
for
example,
can
be performed
in a
one-touch operation.
Power
meters: Each
channel
has its own
power
meter
(0.01W — 160W display range) with a logarithmic com-
pression scale. These meters feature a fast response speed,
and they enable you to read out the power
values at an
8-ohm
impedance
across
a power
band
stretching from
0.01W up to the maximum output of the receiver.
6kHz (high) and 15Hz (low) filter switches: Featured are
a filter for GdB/octave
attenuation
at frequencies below
15Hz in order to eliminate ultra-low-range noise generated
by warps in the records, and also a 6kHz (6dB/oct attenu-
ation) filter that eliminates high-range noise such as that
produced by scratches on the records and hiss.
*Measured
pursuant to Federal Trade Commission's Trade
Regulation
rule on Power
Output Claims for Amplifiers.