The Integrated Amplifier which aimed at the review
from fundamental viewpoints, such as a circuitry, a construction, physical
properties, etc. which are the origins of amplifier, and was developed as the
compilation in order to correspond to the digital source.
The design concept of this amplifier is roughly divided and is collected by three points.
First, in order to make a signal path into the shortest distance, consideration is carried out to the placement of each signal block. Next, thorough measure against vibration proof and measures against absent-resonance-ized are taken. And the improvement in the speaker drive capacity at the time of a low load intensity is achieved.
First, in order
to make a signal path into the shortest distance, the structure called a direct
construction is adopted.
This is making each circuitry block separate and
shielding-izing an I/O block, and has prevented ill effects, such as a failure
of the signal in the interior, and an interference between signals.
block, it was considered as the structure which can operate mechanically an
input & recording selector and a main volume by remote control, and
shortest-ization of leading about of a signal path is attained. Furthermore,
since a signal will not flow into the front panel side if the input signal
chosen with the input selector turns ON a Source-Direct switchpoint, a purer
sound can be enjoyed.
A power amplifier block is arranged along with the
fluence of a signal, and leads the output of the power stage to a speaker
selector straight. Here, distance from a power-source part is made into the
The speaker selector block is also attaining direct attachment
shortest-ization for the speaker termination to the substrate which attached the
relay. As a result, priority is given to the shortest-ized speaker termination
A, and A termination is arranged at the bottom.
Since no vibrating and
absent-resonance-ization are put into practice, the absent-resonance-ized
construction has been adopted, four kinds of honeycomb form is adopted, a
transformer part and a volume system are also united, and the oscillation and
the vibration are lessened in total.
It is in a bottom plate or a bonnet
case about the honeycomb by punching. In order to suppress an oscillation and
vibration of a power transistor effectively, it is an extrusion honeycomb heat
sink of aluminum. In order to stop an extraneous vibration, the honeycomb by
resin shaping is adopted as a large-sized honeycomb insulator, respectively.
Moreover, in the transformer case, the shielding effect was high, the
internal loss was high at the high rigidity, it excelled in the periodic-damping
property, and cast iron with almost no resonance frequency is adopted. While
being filled up with a thermally conductive good pitch material between this
cast iron case and the main unit of a transformer, the heat-dissipation fan was
prepared and the incrementation in the internal resistance of the transformer
coil by a temperature rise is prevented.
Furthermore, it was hard to cause
electromagnetic induction and the mass newly developed seal dead capacitor which
is hard to receive is adopted.
Since it has an ill effect on a tone
quality, the way of maintaining a weight balance in bothways focusing on the
bearing of the rotary knob of a volume is adopted, and a mechanical stress is
kept from starting a volume main unit with the structure where a loading is
applied to the axis of a volume or an oscillation is caused. Moreover, in order
to suppress the influence of an oscillation of amplifier to a min, the floating
of the shielding cover supporting a volume platform is carried out from a body
section with a special paper, and a 2-4kHz vibration harmful to a tone quality
Non switching circuit type dBASE III is adopted.
switching skewness made type IBM PCN II which is not generated theoretically
upgrade further, this circuitry stabilized the idle current which carries out a
drift by transition of outside temperature etc. in an instant immediately after
power-switch ON and at the time of the Taishin number input, and it has
succeeded in suppressing an occurrence of thermal distortion.
detection and correction of the difference of the input/output signals of the
power stage are raised, and nonlinear distortion is reduced, and also the
voltage amplification stage and the power amplification stage are separated
clearly, and the power amplification stage does not have influence in the
voltage amplification stage by concentrating on a speaker drive at the time of
the Oide power, and is improving the speaker drive capacity at the time of a low
The newly developed seal dead capacitor that connected
the aluminum case with the cathode of the aluminum electrolytic capacitor more
certainly is adopted. By shielding a capacitor element powerfully, running out
of the noise from the capacitor itself was lost, and high S/N is realized.
The Phono equalizer could be turned OFF when not hearing a record, and
it has prevented the unnecessary noise occurrence.
Moreover, the OFF
functionality is also given to the recording selector and the purity of sound is
raised by using simple circuitry.
An equalizer part has improved S/N by
adoption of low-noise Hi-gm FET etc. while stabilizing an operation in inside and a quantity region by adopting an original NF-CR type circuitry.
The component partses of a copper plating are adopted as a rear-panel fraction,
a bottom plate fraction, etc. for the distorted measure against an electromagnetic,
and an oscillating measure.
The polar attached-indicator oxygen-free-high-conductivity-copper
very-thick power cord is adopted as a power cord. This code is adopting a
material with a low dielectric constant as an insulating material, and making
the capacitance of a power cord small, and is suppressing the influence of
Moreover, the polarity of the coil of a transformer is
managed and the noise which enters through a code is also held down to the min.
The part which thought as important tone qualities, such as a fuse for
audios, is adopted.
An aluminum Naked began to delete to a rotary knob, and elegance is adopted.
||Stereo Integrated Amplifier
(Both channel drive,
20Hz - 20kHz)
|100W+100W (0.003%, 8ohm)
120W+120W (0.003%, 6ohm)
150W+150W (0.005%, 4ohm)
|Dumping factor (1kHz, 8ohm)
||Phono MC: 0.2mV/100 ohm
month: 2.5mV / 50kohm
compact disk, Tuner, Line, Tape:150mV /, 50kohm
|Phono maximum permissible input
|An Output voltage/impedance
||Tape Rec, ADPT Out:150mV /, 2.2kohm
||Phono MC: 20Hz-20kHz}0.3dB
compact disk, Tuner, Line, and Tape:1Hz-150kHz+0 -3
|Tone control (-40dB)
||Bass: }8dB (100Hz)
Treble: }8dB (10kHz)
|Loudness contour (-40dB)
(An IHFA network, a short circuit)
compact disk, Tuner, Line, DAT/Tape1, Tape2:108dB
|Speaker load impedance
||Power-switch interlock: Two lines (200W)
Power-switch un-interlocking.: One line (100W)
|Power consumption (Electrical Appliance and
Material Control Law)
||Width 420x height 162x depth of 435mm