|320,000yen(one set, the 1983 release)
Force required for power amplifier, and unreturned monophonic power
amplifier polished up, selected carefully and used from the part in quest of the
distorted tone quality which is not.
The super linear circuit is adopted
as a voltage amplification part, with this scheme that cancels the nonlinearity
of a transistor with a transistor with the nonlinearity in the reverse mode, the
linear amplification was realized without the NFB loop and the problem resulting
from NFB is solved.
LAPT (ensemble power transistor) with a high-speed
responsibility is adopted as an output stage.
In order to obtain a linearity
to the last, the electric-current burden per one stone is made light, and it is
parallel six pieces, and is used, and a pure Class-A operation is carried out.
The double locked servo regulator who suppresses a variation of a middle
point voltage to DC stabilization of an important outputting point with
unreturned amplifier, and improves the robustness of a super linear circuit
further is employed.
Furthermore, the special feature of unreturned
amplifier is raised more by having the whole page hardwired-connection stream
composition which put into practice and removed the coupling capacitor
constituting the cause of coloring of sound.
Though it is monophonic
amplifier, two power transformers are used for a transformer.
impedance is reduced by equivalence parallel connection, and also the
power-source drive to an output stage is strengthened.
In order to
remove the factor of a tone-quality failure, while changing the case of the
capacitor into the glass from conventional aluminum, the carbon coating was
given to the glasscase inside, and also the glasscase capacitor which added the
enhancement to electrode foil is developed and adopted.
capacitor of a high-performance and hi-reliability was adopted as the capacitor
of a small capacity, it enclosed with the resin case by the high-density special
epoxy resin, and the cross modulation distortion by oscillation of an electrode
It changes to an iron cap at a drawer part, and the
resistor which adopted brass cap carbon is adopted, and distortion is suppressed
Paying attention to the slight distorted occurrence by the
magnetic substance, the aluminum material which is non-magnetic material was
adopted as all, such as a chassis and a frame, and also the special resin was
coated inside, and equalization of the shielding effect is measured.
the printed circuit board, a mechanical intensity is high, and the glass epoxy
which was excellent in the RF property is adopted.
And the Copper foil is
made to reduce direct current resistance and an inductance by giving
conventional about 4 time thickness of 140micro.
Oxygen free high
conductivity copper was adopted as the place which uses oxygen free high
conductivity copper for the product-line material of a signal system in addition
through which a signal flows, or splicing fittings, and the thoroughgoing style
for the improvement in a tone quality is taken.
The star-quad structure
which used oxygen free high conductivity copper for the material was adopted as
the pin plug code, the self-inductance of the code was reduced, and the flat
transmission characteristics has been acquired to the high region by the low
Since the polarity is unified until the power cord has adopted the
mass code insulated doubly and also reaches [ from a power-cord core line ] even
internal circuitry, AC line and a polar matching can be aimed at.
protection network which detects the bads of an overload, a middle point
voltage, and supply voltage is adopted.
When a middle point voltage carries
out an unusual transition according to the outage of short-circuit of a speaker
termination etc. by this, a speaker and power amplifier are separated.
Moreover, at the time of ON-OFF of a power switch, it operates as a muting
The light emitting diode peek power indicator is carried 20
Peak value is directed without a range change for from 0.001W to the
さ medical college 100W using a logarithmic comression circuitry.
since the peek hold facility is carried, it is convenient for reading of peak
||Unreturned monophonic power amplifier
|Effective output (20Hz - 20kHz)
||80 (20Hz - 20kHz, 8ohm) or more
||220W (Electrical Appliance and Material
||Power-switch un-interlocking.: One line,
||Width 220x height 185x depth of 440mm