|ONKYO Integra A-919
|160,000yen(around the 1992 time)
The Integrated Amplifier which compiled the design
know-how of the Integra series into one book, and put into practice and
investigated the tone-quality intention.
The original super current
amplifier stream composition of Onkyo is adopted as a power amplifier part.
With this amplifier, the Bi-MOS drive scheme which performs a
voltage-electric-current translation in the preceding paragraph of an output
stage is adopted, and it is an electric current with current-drive amplifier. -
The stable and linear amplification is realized by carrying out current
Current-drive amplifier is not influenced by the voltage
-> electric-current transfer characteristic of a transistor like the
conventional output stage, but it has electric-current amplifier composition
which supplies the output current to a speaker in proportion to the electric
current sent from the front stage, and excels in a linearity, and there is also
no variation by a temperature.
Moreover, the Bi-MOS drive scheme adopted as
the preceding paragraph,In a small electric-current area, the property of a
riser curve with loose MOS FET is shown, and the comfortable and linear property
of a bipolar transistor becomes dominant in a large-current area in the
circuitry using two elements, MOS FET and a bipolar transistor. Thereby, the
property very near a linear line was acquired in the crossover area, and the
linearity property which has an elongation also in a large swing area is
Furthermore, as for this power amplifier part, + side / - side
serves as a perfect symmetrical whole page push pull specification, and the
current-drive amplifier stage of the last stage following the
differential-amplification stage of the first rank, a pre driver, and the Bi-MOS
drive stage has 3 parallel composition.
The twin monophonic stream
composition of the right-and-left independency was adopted, the small signal
block was put on the central part, and the power part / power-source part
treating a large current are arranged right and left.
While this suppresses
the cross interferencee by the electromagnetic waves from a large current,
shortening of signal transmission distance is attained.
transformer which reduced the magnetic leakage flux emitted to a perimeter at a
power-source part to about 1/30 as compared with the conventional transformer is
carried in each one right and left a total of two pieces.
interference between each stage is eliminated by making the sub- side coil of a
power transformer become independent in the object for power amplifier, the
object for EQ amplifier, and protector circuitries, and also carrying a
subtransformer in microcomputers.
The chassis structure was made into
3LOAD-RESISTOR-BOX structures, the power-source part and power part treating a
large current were stored in right and left, the input unit equalizer amplifier
which treats a minute signal to LOAD RESISTOR BOX of the central part, and the
preamplifier were stored, and the cross interferencee is eliminated.
Moreover, the bottom chassis is also divided into three in all at this, and
the interference by a chassis electric current is suppressed.
to aim at shortening of signal transmission distance, and a simple transmit, the
multiple contact switch of a motor drive is arranged near the input pin jack, and the volume has also arranged the independent 4-unit type of a shaft drive
near the selector, and has connected signal transmission distance at the
Low-impedance-ization of a circuitry is realized by adoption
of the twin roll chemicon of a high quality and a low-impedance, and the
high-speed diode and 70-micrometer Copper-foil printed circuit board.
The specific technology of Onkyo, such as a delta turbo power source, a
pre / power part independent super servo amplifier, is adopted.
Functionalities, such as a Source-Direct switchpoint, a direct tone
circuitry, a tapes value monitor, MC2 position cartridge selector, and a charge
noise filter, are carried.
The remote control which can operate a power
source, a volume, an input selector, and a muting by a hand is attached.
volume and the input selector adopted the motor drive scheme, and have prevented
nonlinear distortion generated with a semiconductor switchpoint etc.
||LASER transformer loading and super current
|Output power (20Hz - 20kHz)
compact disk->SP-OUT, both channel drive
|THD (20Hz - 20kHz)
||0.0015% (at compact disk->SP Out, the time of 10W output 8ohm)
0.003% (at the time of Phono man month->Rec Out
and 3V output)
0.015% (at the time of Phono MC->Rec Out and 3V output)
|Cross modulation distortion (20Hz - 20kHz)
||0.004% (at the time of compact disk->SP
Out and an Output power)
|Power Band Width
||5Hz - 100kHz (IHF-3dB, THD 0.2%, 8ohm)
||400 (1kHz, 8ohm)
||Phono->Rec Out(RIAA deflection):
compact disk->SP Out: 2Hz-100kHz+0 -3dB
|Phono maximum permissible input
||Phono man month: 2.5mV / 47kohm
Phono MC (for 3-10): 160 microvolts/100 ohm
Phono MC (for 10-40): 160 microvolts/220 ohm
compact disk, Tape Play, Processor IN, other:150mV /, 30kohm
|An Output-power voltage / impedance
||Tape Rec, Processor Out, other:150mV/560
|SN ratio (IHF-A filter input short-circuit)
||Phono man month: 94dB (5mV input)
MC: 75dB (0.5mV input)
compact disk, other:107dB
|The tone control maximum variation
||Bass: ±10dB (20Hz)
Treble: ±8dB (20kHz)
||Switched: Two lines, 100W
One line, a total of 100W
(Electrical Appliance and Material Control Law specification)
||Width 471x height 170x depth of 430mm