|ONKYO Integra A-2001
|280,000yen(November, 1988 release)
It is the Integrated Amplifier which combined the amplifying circuit of
a high purity, and the simple propagation circuit, and also built in the
digital analog converter.
The newly developed optical drive system
is adopted as a power amplifier part.
By this scheme, if light is glared for
the criteria electric current of a first rank differential-amplification
circuitry, it will have obtained from the photoelectromotive-force element which
generates a fixed voltage, and acquiring the criteria electric current of a
precision higher than the conventional scheme is performing highly precise
V-> I conversion.
The parallel push pull scheme constituted from four
Oide power transistors of the collector loss 150W is adopted as the final stage
of a power block, and the generous output is realized.
In the power-source part, in order to prevent an interference taking place between an analog circuit and a digital circuit, the power transformer for exclusive use is used for digital circuits. The object for analog circuits carries the overly large-sized power transformer of sub- side five-line another coil.
Moreover, compared with a thing general in a rectification smoothing
circuit, the resistance value has adopted eight low impedance twin roll
chemicons (96,000 micro F) called 1/3 and the quick high-speed rectifier diode
of a recovery time, and the stable current supply source is performed.
In order to prevent the ill effect by oscillation, the high carbon steel
rigid chassis which was excellent in oscillating dissolution capacity with
increased specific gravity and a quantity mass is adopted, and all the component
partses, such as a power transformer and a substrate of an amplifying circuit, are carried on this foundation.
This chassis has taken the six-point setting
structure, and the setting stabilized by distributing the weight of Integra
A-2001 with a sufficient balance is guaranteed.
In order to prevent
distortion by the cross interferencee of each circuitry, the 4-block perfect
separation construction is adopted.
A power-source block is first arranged at the edge of a TAP box, and a shielding board separates completely, and also an optical drive D/A converter and a digital treatment circuitry are enclosed with the copper plating case by which the electromagnetic shielding was carried out, respectively, and the separation is carried out to the sub- contrary to a power-source part.
Newly developed real 18 bit and, and optical drive
twin digital analog converter are carried in the digital circuit.
||Digital basic amplifier
|Output power (20Hz - 20kHz)
compact disk->sp out, both channel drive
|THD (20Hz - 20kHz)
||compact disk->sp out: 0.004% (at the time of an Output power 8ohm)
phono man month->rec out: 0.003% (at the time
of 3V output)
phono MC->rec out: 0.015% (at the time of 3V output)
|Cross modulation distortion (20Hz - 20kHz)
||compact disk->sp out: 0.004% (at the time
of an Output power)
|Power Band Width
||5Hz - 100kHz (IHF-3dB, THD 0.2%, 8ohm)
|Dumping factor (1kHz, 8ohms)
||phono->rec out(RIAA deflection):
compact disk->sp out: 2Hz-100kHz+0 -3dB
||phono man month: 2.5mV / 47kohm
MC: 160 microvolts/220 ohms
compact disk, others : 150mV / 47kohm
|Phono maximum permissible input
|An Output-power voltage / impedance
||tape rec, other:150mV/560 ohm
||VCR, other:1 Vp-p/75ohm
|SN ratio (IHF-A filter input short-circuit)
||phono man month: 95dB (5mV input)
MC: 77dB (0.5mV input)
compact disk, other:107dB
|The tone control maximum variation
|Muting (Volume below center)
||Electrical: 1 Vp-p/75ohm
||32kHz, 44.1kHz, 48kHz
|THD (1kHz, 0dB o'clock)
|Power consumption (Electrical Appliance and
Material Control Law)
||switched: Two lines, a total of 200W
unswitched: Two lines, a total of 200W
||Width 477x height 183x depth of 453mm