Audio Database

The pictorial image of Integra M-955National Information Infrastructure/260

ONKYO Integra M-955NII/260
139,800yen(1975 release)

Power amplifier which supplied various technologies while compiling the circuitry technology accumulated by Integra into one book, and aimed at the modification of the play of an inside bass region.

The dual channel scheme independent source is adopted, and while removing the cross interferencee from the power source at the time of the Class B operation by using a large-sized cut-core transformer for right-and-left both channel independency, a large-sized power circuit, such as also using especially a capacitor with large capacity, is constituted.

In order to reduce a grounding impedance, electric resistance has equipped the bus-grounding line which uses the copperplate of the 1.0mm thickness near about 0, and 5.5mm the copper wire two equivalent to 50 core code 5 regular text.
Moreover, while using low ±2 power-source electrolytic capacitor of a grounding impedance for a capacitor, in order to abolish the variation by an impedance with Handa, the screw terminal type is adopted.

The parallel push pull OTL circuitry designed newly is adopted as an output circuit focusing on the improvement in the linearity in a modification of a riser property, a distorted reduction, especially Loule Bell.
In order to drive to an up-and-down symmetry, the differential push pull type drive circuitry which has a current mirror circuitry of a new-installation meter is operated by another high voltage power supply.

The film capacitor of a unguided extended foil structure is adopted as the coupling capacitor which affects play sound.

They are the powerful Class B drive and the compatible design of the first class drive for a super-low-distortion play.
It is the design which minded enough also at the linearity in mini power or the time of the Class B operation.

In order to monitor an output, the peek monitor by light emitting diode is built in.
The point clipping output and a point of -3dB can be monitored.


Rating of a mode
Form Stereo power amplifier
Output power (1kHz)
At the time of a first class operation : 28W+28W (8ohm)
39W+39W (4ohm)
At the time of the Class B operation : 130W+130W (8ohm)
170W+170W (4ohm)
20Hz - a 20kHz output (8 ohm, T.H.D.0.03%) At the time of a first-class operation: 28W+28W
At the time of the Class B operation: 130W+130W
Dynamic power (8 ohm, 1kHz) At the time of a first-class operation: 56W
At the time of the Class B operation: 310W
THD (T. H.D., 8 ohms, 1kHz) At the time of an Output power: 0.03% or less
At the time of 10W output: 0.03% or less
At the time of 0.5W output: 0.03% or less
Cross modulation distortion
(at SMPTE, the time of an Output power 70Hz : 7kHz = 4:1 or 8ohms)
0.05% or less
Power Band Width (IHF-3dB, T.H.D.0.3%, 8ohm) 10Hz - 100kHz
S/N (an IHF A network, an input shunt, 8ohm) 110dB or more
Dumping factor (DC-20kHz, 8ohms) 80 (8ohm)
40 (4ohm)
Load impedance 4ohm-16ohm
Input impedance (10Hz - 50kHz) 100kohm
Gain 26.7dB
Rated input voltage At the time of a first-class operation: 0.7V
At the time of the Class B operation: 1.5V
Output-terminal Speaker: Two lines (System1&System2)
The semiconductor used Transistor: 58 pieces
Diode: 60 pieces
light emitting diode: Four pieces
Power source AC100V, 50Hz/60Hz
Power consumption Electrical Appliance and Material Control Law specification: 210W
Maximum electric power consumption: 568W
Dimensions Width 440x height 158x depth of 370mm
Weight 19.8kg
Option Wood case CW-6 (3,000yen)