|430,000yen(around the 1982 time)
amplifier carefully finished from the idea "the amplifier for having a music
It returns to the origin of the amplifier design of "amplifying an input signal faithfully and reproducing as an output signal", and the "new super linear circuit" which acquires a property without applying NFB is developed and carried. This banished TIM distortion from the origin and the stability in a high region is secured.
Distortion of switching
distortion, crossover distortion, etc. serves as Class-A power amplifier which
is not generated theoretically, and the power-source scheme original with M5
which prepared the exclusive power source in Class-A biases is adopted.
having raised the efficiency ratio of the power source, there is not too much
exothermic made into the difficulty of Class-A amplifier.
It puts into
practice among all the component partses and constructions, the study is added,
the technology which it can have is poured in, and the highest component partses
are developed and selected carefully and are used.
The power transformer
is designed in quest of the implementation of low leakage flux and the stable
First, the oxygen-free-high-conductivity-copper line by which polyesters clothing was carried out is adopted as a coil. This coil has improved the regulation by giving the twice as many cross section as this compared with a general thing, and is also suppressing the temperature rise in the one-half. Furthermore, the improvement in S/N is realized by adopting the toroidal scheme which has an effect in a falloff of leakage flux.
In the transformer case, using the resin which are the body not conducting
current and non-magnetic material, the silicon carbide powder of a radio-wave absorber is mixed in a fill, and distortion is suppressed. Moreover, the
oscillation is reduced by carrying out the floating of the main unit of a
transformer from a chassis with rubber.
In order for - quantity region to riot and to prevent a resonance while
originating in the structure of a film capacitor, the newly developed film
capacitor for pure audios is adopted. tandelta (dielectric loss) has a
small polycarbonate and the high degree of insulation, and the material
of a film has a compound structure of polypropylene excellent in the RF
property. The resonance is prevented by winding this up firmly with a low
speed and a high tension, losing wrinkles and stress, and making full use
of a still more nearly special volume core and a heat-shrink resin. Moreover,
in order to prevent the influence of an external electric field, the double
shielding is given with the electric conduction resin case and the electric
conduction resin tube.
4 core power cord for
audios which added and developed the study from the origin of the power cord is
By using the high oxygen-free-high-conductivity-copper line of a
conductometric for a conductor, this power cord reduced the loss in the wire
rod, and has achieved the nonlinear extensive distorted modification.
Furthermore, the cross interferencee of two power transformers was suppressed
and the reduction of source impedance is realized.
polyethylene with a low dielectric constant is adopted as an insulator. This
reduced the loss and the conductor oscillation is prevented.
In order to
be stabilized and to supply the high power of 300W to a speaker, the large-sized
output-terminal is newly carried.
The opening for a code interconnection is
made large with 3.8x14mm, and makes the speaker cable of the very thick the
interconnection possible. Moreover, the connection method with a code serves as
a vice type which sticks a code by pressure by the plate of two sheets which
carried out the knurling tool manipulation of the inside.
manipulation is performed to the contact surface and the stability and the
robustness are improved.
The fuse for audios which added the study to
material etc. anew and was developed is adopted as a fuse.
Conductor resistance is suppressed to about 1/3 by changing mouthpiece
material into a pure copper from the conventional brass. Furthermore, it
changed into the pure gold group from the composition, and the nonlinearity
between the heterogeneous metalses generated inside the composition is
plating which is ferromagnetic material was changed into the tin plating which
is non-magnetic material, and a magnetic distortion is banished.
glass epoxy group board developed in audios is adopted as a substrate, and the
nonlinearity is improved by leaps and bounds by using oxygen free high
conductivity copper of 99.99% of a purity. Moreover, by changing old 35micro
copper into 280micro thick copper, conductor resistance is pressed down to one
eighth and the transmit of the stable signal is enabled.
By adopting the
glass epoxy group board excellent in the wetproof property, the transition of
the electrostatic capacity in a Copper foil was suppressed to the relative
minimum, and the leakage in a circuitry is prevented.
||Monophonic power amplifier
|Effective output (20Hz - 20kHz)
||Peak level meter
|Power consumption (Electrical Appliance and
Material Control Law)
||Width 468x height 203x depth of 410mm