|110,000yen( at the 1970 in-the-late time(?))
DC power amplifier of AB class operation.
Circuitry has a 3 steps of first rank dual FET
differential-amplifications cascade bootstrap pure complimentary push pull +
Darlington connection, a whole page hardwired-connection OCL scheme, and DC
The low-noise type thing which excelled Dual FET in the property thermally
and electrically is selected carefully, and the pair property required
for the element of DC amplifier first rank is maintained.
The whole page DC stream composition is adopted and the capacitor is
banished from the signal system or NF loop.
About the drift of the middle
point potential which poses a problem, it has realized stabilizing DC balance
with a circuitry technology at the same time it raises the stability of the
middle point potential of a differential-amplification part.
advantage of the merit of the tone quality of Class-A amplifier, AB class
operation method which can acquire the Oide power is adopted.
Usually, it is
a Class-A operation at the time, and it changes to B class operation
automatically at the time of the Taishin number which needs big power.
The low distortion is realized by investigating thoroughly until it
results in the design of the printed circuit board, or a placement of a
shielding code including a material or component partses.
It excelled in
the high efficiency at the regulation, and the large-sized toroidalcore type
transformer with little leakage flux is adopted as a power-source part.
As a protection network, the electro carry control ASO (area of safe
operation) circuitry and DC feedback power limit circuitry are carried. The
electro carry control ASO circuitry has protected the transistor and speaker of
amplifier by relay operation. Moreover, the DC feedback power limit circuitry
operated quickly to the overload, and has protected the transistor.
Furthermore, in returns-to-biases-2000, a relay for exclusive use and an in
rushes absorber are prepared also to the in rushes electric current at the time
of the power activation which poses a problem with the Oide power amplifier, and
the security and the robustness are improved.
The peek power meter is
carried. Unlike the usual meter, this meter serves as a type which displays peek
power with a quick elevation of a pointer and late return. Thereby, reading of
the peek of power is made easy.
Moreover, a tick mark is logarithmic
compression mold and enables the exact window from the very small output time
till the Oide power.
Though DC component is cut with DC direct
interconnection, two input terminals with an input capacitor termination which
can maintain a tone quality and a property are carried.
by which the gilding treatment was carried out is adopted.
panel serves as EIJ specification rack-mounted type.
||Stereo power amplifier
|Output power (both channel drive)
||140 W/ch (4 ohm, 1kHz)
120 W/ch (8 ohm, 20Hz - 20kHz)
||0.01% (at the time of 20Hz - 20kHz, and an
|Cross modulation distortion
||0.015% (at the time of an Output power
|Frequency characteristic (1 W/ch, 8ohm)
||DC in:DC-100kHz+0 -1dB
|Dumping factor (8ohm)
||60 (20Hz - 20kHz)
|S/N ratio (IHF-A network short-circuit)
|Square wave rise time
|Maximum electric power consumption
||Width 482x height 143x depth of 430mm