Technics SA-5570 User Manual

STAR FEATURES
BB A highly-stabilized main amplifier section with
a low distortion ratio
The basic circuitry of the main amplifier section of this unit
is the differential-amplification, all-stage, direct-coupled
OCL type of circuitry. “Dual-package” transistors are used
in the differential-amplification stage of the first stage, and,
in addition, a Zener diode is used for stabilization of the
operation of the common emitter power source...thus
resulting in a circuit design which has exceptionatly high
direct-current stability.
In addition, the output stage uses a combination of PNP and
NPN transistors to form pure complementary circuitry, and
the high-harmonic distortion ratio and the cross-modulated
wave distortion ratio are very low, thus resulting in a
superb high-frequency characteristic.
With regard to dynamic characteristics also, great care was
taken to assure extremely faithful amplification, with a low
distortion ratio, of even the most complex music signals.
@ Equalizer circuitry with high signal-to-noise
ratio
The equalizer circuitry of this unit is the 3-stage, direct-
coupled type, using low-noise, highly voitage-resistant
integrated circuitry, in addition to low-impedance negative-
feedback circultry, thus resulting in a sensitivity of 2.6 mV
and a high signal-to-noise ratio of better than 78 dB.
Moreover, in order to obtain an excellent RIAA reproduc-
tion characteristic, the negative-feedback element, which
is so important in that respect, uses highly precise com-
ponents which have a resistance deviation of 2.0% or less,
thus resulting in a highly precise RIAA deviation of 0.2
dB or less,
@ Tone control circuitry with low distortion ratio
and smooth variation characterlstics
The tone control circuitry of this unit uses the BAX-type,
negative-feedback type of tone control, which is composed
of 2-stage, direct-coupled circuitry in which low-noise
transistors are used. The result is smooth variation charac-
teristics, and exceptionally iow undulation of the frequency
response at the intermediate volume point.
ll Highly sensitive, high-performance FM
front-end
In addition to a dual-gate MOS FET in the RF-amplification
stage, and high-irequency, low-noise transistors in the
mixer stage—thus resulting In a highly stabilized RF stage
with @ high signal-to-noise ratio, the FM front-end is as-
sured of high performance by the use of an oscillation coil
in order to prevent local oscillation.
Furthermore, the adoption of a newly developed frequency-
jinear-type 3-gang variable capacitor makes tuning ac-
curacy exceptionally high.
In addition, the use of delay AGC circultry assures good
reception, with a low distortion ratio, even under condl-
tions of strong input power.
I Strong emphasis placed on circuitry design
for excellent group-delay characteristics in the
FM IF section
In order to place importance upon the group-delay charac-
teristics when designing the circuitry of the FM IF section,
because they are so closely related to distortion and sepa-
ration, three 2-element, group-delay, flat-type filters are
used, and, in addition, in order to obtain excellent ampli-
tude, the 7-stage IF-amplification system has six differential-
amplification stages, resulting in selectivity of better than
70 dB and a signal-to-noise ratio of better than 75 dB...with
a sharp increase in various characteristics during both
stereo and monaurai reproduction.
In addition, because the muting circuitry includes both wide
and narrow AND circuitry, the “popping’’ noise heard when
a broadcast is detuned has been eliminated.
@ MPX section with highly stable PLL
Use of the PLL system assures that the switching signal
can to applied at higher stability and for longer periods.
The switching circuitry consists of high-density integrated
circuitry which is comprised of double differential switch-
ing circuitry, resulting is great improvement in the delay
characteristics, the stereo distortion, the non-linear cross-
talk, and the separation.

Technics SA-5570 Specifications

General

Brand	Technics
Model	SA-5570
Category	Stereo Receiver
Language	English