(Otomono Lab) OTOMON VT62/VT25/10Y Drive 805/805A Single-Ended Vacuum Tube Amplifier, outputting 20W per channel. The output transformer uses a super core and weighs 9 kg. It can handle a DC current of up to 160mA. Output impedance can be selected from 4, 8, and 16 ohms. Although it's an amplifier specifically for the 805, you can use the 805A without adjustment by attaching a plate cap. Four types of vacuum tubes can be used in the driver stage: VT62/801A/VT-25A/10Y. You can switch between the tubes and enjoy the different sounds. It outputs 20W (THD: 5%) per channel, and can drive speakers with a sensitivity of 85dB or higher without any problems. The residual noise is less than 0.9mV without negative feedback, and -3dB and -6dB of overall feedback can be selected. With NFB at -6dB, the residual noise is only 0.4mV, allowing it to be used without problems with high-sensitivity speakers such as horns. The 717A is used in the first stage, and the rectifier tubes are compatible with 5AR4, 5R4GW, and GZ34. Before listing, the amplifier was inspected by the manufacturer (Otomono Lab) and returned to a like-new operational state. As it is a used item, there are scratches and dirt on the transformer, but it is generally in a clean condition. The manufacturer's warranty is 3 months. Otomono is a Japanese manufacturer. The manufacturer's website is https://otomon.net. Please access the website for more information. Vacuum tubes used: First stage tube: 717A/6SJ7 Driver stage: 801A, VT62, VT-25A, 10Y Output tube: 805, 805A Rectifier tube: 5AR4 (GZ-34, 5R4GW, etc.) Vacuum tubes are not included and must be provided by the winning bidder. Specifications: (Measured by the manufacturer) Frequency response: 16Hz ~ 45KHz Residual noise: Less than 0.5mV Size: W495 x D410 x H350mm THD: 5% 20W (8Ω) There is no hum or noise, and the soundstage is wide with a rich amount of information. It doesn't matter what genre of music you listen to; the sound is clear and the musicality is superb.