Feature:1. Using 6J5 electronic tube and fine-quality NE5532, and BT4.2 version do not support APTX function.2. The main filter capacitor adopts 470UF/25V, and the coupling capacitor adopts 1UF capacitor.3. The resistor uses a high precise chip resistor, and first-class printed circuit board quality.4. The printed circuit board adopts 1.6mm thickness double-sided sheet, 2.0ounce copper thickness, and the whole process of tin-spraying ensures the fine passing performance of the current.5. The layout of board is reasonable, beautiful, and with small current noise.6. The input and output interface are made of gold-plated lotus pedestal, which is long lasting and beautiful.7. Three knobs design improves everything detail, transparency, immediacy, richness, you can get both powerful or sweet sound easily.Specification:This amplifier adopts 6J5 electronic tube and fine-quality NE5532, and BT4.2 version do not support APTX function. The main filter capacitor adopts 470UF/25V, and the coupling capacitor adopts 1UF capacitor. The PCB adopts 1.6mm thickness double-sided sheet, 2.0ounce copper thickness, and the whole process of tin-spraying ensures the fine passing performance of the current.Features:Using 6J5 electronic tube and fine-quality NE5532, and BT4.2 version do not support APTX function.The main filter capacitor adopts 470UF/25V, and the coupling capacitor adopts 1UF capacitor.The resistor uses a high precise chip resistor, and first-class printed circuit board quality.The printed circuit board adopts 1.6mm thickness double-sided sheet, 2.0ounce copper thickness, and the whole process of tin-spraying ensures the fine passing performance of the current.The layout of board is reasonable, beautiful, and with small current noise.The input and output interface are made of gold-plated lotus pedestal, which is long lasting and beautiful.Three knobs design improves everything detail, transparency, immediacy, richness, you can get both powerful or sweet sound easily.Specifications:Name: PreampMaterial: printed circuit boardColor: black, silver (optional)Power supplys: DC12VItem size: 137 * 104 * 41mm / 5.39 * 4.09 * 1.61inPackage size: 250 * 200 * 70mm / 9.84 * 7.87 * 2.76inPackage weight: 500g / 1.10lbPacking List:1 * PreampPackage List:1 * Preamp