It's a small amplifier with quite a lot of power. It uses a solid linear power supply instead of a trendy switching power supply. Details are unknown. I will pass the status quo for my own work (Shota Sasaki)
Maintenance Information: 2022.4.23 Operation confirmed
Accessories: power cable
Main specifications: W204 × H50 × D192 mm (actual measurement)
※ 6 months warranty. The beautiful mid and high tones typical of MOS FET demonstrate its strengths in playing small classics and female vocals. The appearance is dull and there are small scratches (Satoshi Yoneshima)
Maintenance information: 2022.1.30 operation confirmed
Accessories: No accessories
Main specifications: W205 × H110 × D390mm 5.8kg
Disposal price has been reduced. Member price is out of application. 2021.5.31 sales price 1,480,000 yen maintained. The mono power amplifier of the company's flagship model. The circuit configuration uses YBA's proprietary Class α operation, while the output side operates in Class AB, but the power supply always operates in Class A to benefit from Class A without heat loss. The power consumption is up to 2000 W, but it still has been reduced to low below 40°C. The drive power that drives the large speaker firmly and its clear and transparent tone without distortion is attractive. External feeling has dents, small scratches, dullness (Oikawa Tetsuji)
Maintenance information: 2021.5.31 Maintained (lamp replacement, input/output waveform check, load test (1kHz sine wave, 8Ω load: 240W/240W, OK), sound output test)
Accessories: power cable
Main specifications: Rated output 500W (4Ω), 250W (8Ω), 3500W (peak) Power consumption max: 2000W, minimum: 15W W510 × H270 × D480 mm 65kg
The price has been reduced! 2021/11/8Sales price 150,000 yen A non-feedback amplifier that enables a special good circuit without applying NFB by Alpha class operation that takes the conventional A class operation one step forward. The clear and fresh sound that is unique to the company is attractive. It is a model that I want to match with a beautiful sound speaker. Appearance has small scratches, line scratches, dullness, etc. Serial 21450 (Satoshi Yoneshima)
Maintenance information: 2019.9.15 Maintained (power switch fix, speaker protection fuse holder fixed by soldering, leg installation separately due to leg parts not available, bias readjustment, (Spec inspection)
Accessories: instruction manual, power cord
Main specifications: 70W+70W (8Ω) 140W+140W (4Ω) W430 × H103 × D360mm 13kg
※There is no operation problem, but since it is cheap, it is currently sold. Although it is small, it has a 50W+50W stereo output, so you can use it anywhere. The exterior has small scratches, dullness, etc. (Mizusaki Ryo)
Maintenance information: 2023.8.4 sound output confirmed
Accessories: original box
Main specifications: 50W+50W (8Ω) W220 x H90 x D300 mm Weight 4.3 kg (actual measurement)
Maintained! Stereo power amplifier equipped with output impedance control. It is a power amplifier from the heyday of separation, which is supported by a solid power supply unit and chassis, and can firmly reproduce even the smallest nuances. There are dullness and small scratches on the exterior (Tomonori Asae)
Maintenance information: 2024.5.9 Maintained (replacement of defective output relay contacts. Replace deteriorated capacitors in the power supply circuit. (Repair and adjustment within each circuit)
Accessories: none
Main specifications: rated output 120W+120W (8Ω Class B) 30W+30W (8Ω Class A) rated power consumption 330W W435 × H146 × D381 mm 21kg