1. Use IRF240 MOS tube. 2. The input coupling capacitor is50V / 3.3UFimported from Germany, and the main circuit of the electrolytic capacitor signal is . 3. The resistor uses five-ring metal resistors, and the main circuit uses five-ring metal film resistors with an accuracy of +/- 1% to a good signal-to-noise ratio for the whole machine. 4. The PCB uses 1.6mm thick double-sided sheet, 2.0 oz copper thickness, and the whole process of spraying tin to good passing performance of large and small currents. Best-in-class PCB quality. The wiring layout of the entire circuit board is quite rigorous and reasonable, and the overall PCB routing adopts a little grounding method. 5. The power amplifier board works stably and reliably with high output power; the sound is beautiful and round, and the sound field is wide. Strong three-dimensional sense, stable and solid low frequency, excellent signal-to-noise ratio, wide dynamic range; clear details, excellent transient response, all kinds of music can be handled freely, and it has a very good performance in the home playback environment. Power supply: + -35V to + -45V Power: 100W (+ -45V 4ohm)/ 1 channel Distortion: is 0.012% into 1 kilohertz and full power is 0.015% into 10 kilohertz and full power Quiescent current: 20MV colour: as shown Material: ABS Size: 9x5.4cm Package Contents: 1 Pair Amplifier Board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.