ONKYO Integra M-955NII/260
¥ 139,800 (released in 1975)
Commentary
This is a power amplifier that integrates the circuit technology accumulated in the Integra and incorporates various technologies to improve playback in the mid and low frequency range.
A dual channel system independent power supply is adopted, and a large cut core transformer is used for both left and right channels independently to eliminate mutual interference from the power supply in B-class operation, and a large power supply circuit is constructed by using a capacitor with especially large capacity.
In order to reduce the earth impedance, a copper plate of 1.0 mm thickness with almost 0 electric resistance and a copper plate of 5.5 mm corresponding to a 50-core cord of 5 bodies are used.2It is equipped with a bus ground line using copper wire.
A ± 2 power electrolytic capacitor with low earth impedance is used for the capacitor, and a screw terminal type is adopted to eliminate variations due to soldering impedance.
The newly designed parallel push-pull OTL circuit is used for the output circuit, focusing on improving the rise characteristics and reducing distortion, especially improving the linearity at the low level.
In order to drive vertically symmetrically, a differential push-pull type drive circuit with a newly designed current mirror circuit is operated by another high-voltage power supply.
A film capacitor with a non-inductive extended foil structure is used as a coupling capacitor that affects playback sound.
The design is compatible with a powerful B-class drive and an A-class drive for ultra-low distortion reproduction.
Even in B-class operation, it is designed with sufficient attention to linearity in mini-power.
A peak monitor with LED is built in to monitor the output.
You can monitor the output clip point and the -3dB point.
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Model Rating
| Type | Stereo power amplifier | ||||
| Rated Output (1 kHz) |
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| 20 Hz ~ 20 kHz Output (8 Ω, T. H. D. 0.03%) | A-class operation : 28W + 28W B class operating : 130W + 130W |
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| Dynamic Power (8 Ω, 1 kHz) | A-Class Operating : 56W B-Class Operating : 310W |
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| Total Harmonic Distortion Factor (T. H. D., 8 ω, 1 kHz) | Rated output : 0.03% or less 0.03% or less at 10 0.03% or less 0.03% or less at 0.5W output |
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| Intermodulation distortion factor (SMPTE, at rated output, 70 Hz : 7 kHz = 4 : 1, 8 Ω) | Not more than 0.05% | ||||
| Power Band Wiz (IHF-3dB, T. H. D. 0.3%, 8 Ω) | 10 Hz to 100 kHz | ||||
| S/N (IHF A network, input shunt, 8 ohm) | 110 dB or more | ||||
| Damping Factor (DC ~ 20 kHz, 8 Ω) | 80 (8 Ω) 40 (4 Ω) |
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| Load impedance | 4 Ω ~ 16 Ω | ||||
| Input impedance (10 Hz to 50 kHz) | 100k Ω | ||||
| Gain | 26.7dB | ||||
| Rated input voltage | Class A operation : 0.7 V Class B operation : 1.5 V |
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| Output terminal | Speaker : 2 systems (System1 & System2) | ||||
| Semiconductor used | Transistor : 58 pcs Diode : 60 LED : 4 pcs |
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| Pwer | 100 VAC, 50Hz/60Hz | ||||
| Power consumption | Electrical Appliance and Material Control Law Standard : 210W Maximum power consumption : 568W |
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| External dimensions | Width 440x Height 158x Depth 370 mm | ||||
| Weight | 19.8kg | ||||
| Sold Separately | Wood Case CW-6 (¥ 3,000) |