Onkyo (Onkyo) Integra M-955NII/260 Class A class B amplification switching stereo power amplifier It is a fully functioning product. It is the thing which maintained the unstable operation goods which were obtained. It was a large stereo power amplifier that Onkyo released in 1995. At 139,800 yen, it was a high price at that time. Equipped with large left and right independent power transformers, it outputs B class 130 W x 2, A class 28 W x 2, and weighs about 20 kg. It is not a DC amplifier that can amplify up to direct current because it has a coupling capacitor in the signal circuit. The power part is a pure complementary circuit using ±2 power sources. Switching between class A and class B amplification is done with a switch inside the chassis bottom plate, and usually it is a type that is fixed to either amplification format. The block capacitor of the power supply is equipped with two huge cylindrical type of 15000μF x 2 each. I replaced all the electrolytic capacitors that were supposed to deteriorate except for these with Nichicon's Fine Gold and MUSE for audio. The output transistor is a parallel push-pull that uses two metal can 2SB554 and 2SD424 per channel. Carelessly, I skipped several pieces due to carelessness during maintenance and replaced them with new ones. Since normal operation was confirmed at this stage, other transistors were not replaced. At the time of new assembly, it was a model that would have been produced by a large number of workers with human wave tactics, and the maintainability was by no means good, and it took a lot of time to repair, but it was worth it. After maintenance, DC balance and idling current adjustment for A and B classes were performed. The front panel is equipped with an LED indicator that lights up at half output and full output. However, it is designed to light up until the relay is cut off when the power is turned on, and we were able to confirm that all four LEDs were lit, so there is no disconnection in the LED itself. It is misleading to say that the sound quality does not suit a large body, but it is very delicate and the female vocal reproduction is wonderful. The quality of the voice or the feeling of touch is expressed well. The sound field expands in front of the speaker. The low range is also sufficient, backed by a strong power supply. This is my personal impression, but I felt that it was very similar to the expression of Yamaha's CA-2000 that I had serviced before. It's an amp that you don't often see on the market, but I think it's a powerful enough machine. However, despite the high price, the front panel is made of plastic, and the speaker terminals are compatible with thin cables, which is a bit disappointing. Please note that the bottom plate clearly states that the power must be turned off when switching between A and B classes. I forgot this and failed during maintenance. In addition, please pay attention to the installation space because there is a lot of heat generated during class A amplification. Equipped with independent left and right input attenuators. Although it has been washed with CAIG, please understand that there may be a slight gully. It is generally a beautiful product, but there are some small scratches on the upper part of the front panel. The content of the exhibition is only the main body.

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