(Otomondo Lab) OTOMON 205D/2A3/300B Compatible SE Vacuum Tube Amplifier, Non-Feedback. This product is made to order. Delivery time is 6 weeks. Three types of vacuum tubes are compatible, allowing you to enjoy various sounds and timbres. The output is 5W (THD: 5%) when using 300B vacuum tubes. With low voltage and constant current specifications, you can use valuable 300B tubes such as Western Electric and Takatsuki for a long lifespan. Designed for full-range and field coil speakers, it is also ideal for speakers with high sensitivity. Although it is a 5W amplifier, 2A3 and 205D have low output, so speakers with a sensitivity of 92dB or higher are recommended. It is a non-feedback amplifier. With a hum of less than 0.2mV, there is no noise or hum even when used with a horn system. The 717A is used in the drive stage, and 80/83/274A can be used as compatible rectifier tubes. The output tubes can be switched between 205D/2A3/300B with a switch. Alternatively, modern Psvane 205D to Western Electric WE 205D can be used without any problems. Before listing, the manufacturer (Otomondo Lab) inspected the amplifier and restored it to a new condition in terms of operation. Since it is a used item, there are scratches and stains on the transformers, but it is generally in a clean condition. The manufacturer's warranty is 3 months. Otomondo is a Japanese manufacturer. The manufacturer's HP is https://otomon.net. Please access the website for more information. Vacuum tubes used: First stage tube: 717A Output tubes: 205D/2A3/300B Rectifier tubes: 80 (83, 5Z3, 274A, etc. can be used, but the voltage will be slightly higher) Vacuum tubes are not included, so the winning bidder will need to provide them. Specifications: (Measured by the manufacturer) Frequency response: 30Hz ~ 18KHz Residual noise: 0.2mV or less Size: W400 x D285 x H230mm THD: Output and distortion rate (8Ω) 205D: 1.6W (5%) 2A3: 3.5W (5%) 300B: 5W (5%) It is a non-feedback amplifier with no hum or noise, and the sound is clear and the musicality is excellent. Recommended for high-sensitivity horn systems.