Stereo power amplifier which supplied and developed the technology which
Pioneer can have.
The direct construction which shortest-izes a signal path
in order to pursue three technical themes and to lose the cross interferencee of
a signal,No vibrating and the absent-resonance-ized construction which
suppresses an oscillation and a vibration harmful to the low load-intensity
drive capacity and sound which raise the dynamic drive capacity of a speaker are
put into practice.
While using a large-sized power transformer by two
right-and-left independencies, the resin coating electrolytic capacitor of
10,000 micro Fx2 is adopted as each channel. Furthermore, the right and negative
side of a power source is carrying out the bridge rectification of each for high
speed low-noise diode by dividing into two from the coil of the power
transformer. It is possible for this to supply the music signal of a large
electrical power by a low distortion.
Furthermore, the power transistor was
also considered as 4 parallel push pull stream composition of Pc=130W type, and
the large-current supply capacity 47A is realized.
Two input terminals,
compact-disk direct and a line direct, other than the power in from the usual
control amplifier are carried. A level control is possible for these direct
Moreover, the copy to a tapes etc. is possible by also carrying the
output-terminal for exclusive use in this compact disk/Line direct termination, and returning to control amplifier etc. from here.
construction is adopted in order to attain shortest-ization of a signal path.
The high-quality sound volume and the relay itself have been arranged to the
input terminal nearness near a rear panel, and it has controlled the volume
through the remote shaft made from brass.
Shortest-ization of a signal path
is realized without this spoiling an operationality.
In order to put
into practice and suppress an internal and external oscillation, while forming a
transformer into CAS Ted, a heat sink, chassis frames, and honeycomb form
original with a large-sized insulator are adopted, and the oscillation is
distributed in many fields.
High cast iron of the shielding effect is
adopted as the transformer case of M-90a. While being filled up with a thermally
conductive good pitch material between this cast iron case and the main unit of
a transformer, the radiation fin was prepared and the incrementation in the
internal resistance by a temperature rise is also prevented.
The thing of
the 1.6mm thickness which gave the copper plating to honeycomb structure is
adopted as the transformer frame supporting a transformer. Furthermore, in order
to press down a frame chassis firmly, the copper plating 1.6mm thickness
vibration proof honeycomb punching bottom plate is adopted.
A vibration and
an oscillation of a power transistor were suppressed in the heat sink, and the aluminum extrusion honeycomb heat sink excellent also in the heat-dissipation
effect is adopted as it.
Furthermore, four filling type large-sized
insulators made from special cell polymer are adopted, and in order to support a
transformer with weight, the insulator of five flat knots made of cast iron is
also carried in the insulator.
Switching distortion has adopted the non
switching circuit which is not generated theoretically, expands the area of switching distorted zero, and is attaining wide band-ization. Moreover,
immediately after power-switch on and at the time of the Taishin number input,
the idle current which is carrying out the drift by transition of ambient
temperature is stabilized, and the occurrence of the thermal distortion
resulting from this is suppressed.
Furthermore, the nonlinear distortion of
an output stage is decreased by detecting and rectifying the difference of an
input signal and an output signal.
The copper plating chassis which
reduces a magnetic distortion sharply is adopted. Moreover, by considering it as
a copper plating, it will be in the pasting status of heterogeneous metalses, and the amount of periodic damping is improving compared with the case of a
single metals using.
The large-sized size power indicator (39mm x 98mm)
is carried, and the Direct reading of the output transition from 2mW to 300W
(8-ohm o'clock) can be carried out without a change.
Moreover, in order to
make peek power easy to read, the peek hold facility for 0.6 seconds is also
The non stress power cord which used the
oxygen-free-high-conductivity-copper line with a polar window which suppressed
the influence of external noise,Quality parts, such as the vibration proof type
film system capacitor using a soft coating material, an electrolytic capacitor
of a special resin coating, oxygen-free-high-conductivity-copper line
product-line material, a brass cap carbon resistor, a 70-micrometer Copper-foil
substrate, and a gilding input/output pin jack, are adopted.
||Stereo power amplifier
|Effective output (both channel drive)
||1kHz: 200W+200W (4 ohm, 0.01%)
20Hz-20kHz:200W+200W (8 ohm, 0.003%)
(EIA testing signal)
|THD (20Hz - 20kHz)
||0.003% (200W, 8ohm)
|Cross modulation distortion (50Hz:7kHz=4:1)
||0.002% (at the time of an effective output)
||Control Amp, compact disk Direct, and Line
|An Output voltage/impedance
||compact disk/Line: 1V/1kohm
||Control Amp, compact disk Direct, and Line
Direct:20Hz-20kHz+0 -0.1 dB
|SN ratio (A network, a short circuit)
||Control Amp, compact disk Direct, Line
|Power consumption (Electrical Appliance and
Material Control Law)
||Width 457x height 163x depth of 432mm