Feature:1. ADOPT 6J1 TUBE: This preamp board uses the original 6J1 tube, the sound is soft and beautiful, with more concentrated low frequency.2. EXCELLENT CAPACITOR: The main filter capacitor adopts the original 1000UF 35V, and the coupling capacitor adopts the capacitor 1UF.3. METAL RESISTOR: The resistor is made of 5 rings 1% metal resistor, which ensures a good signal to noise ratio of the whole machine.4. DOUBLE SIDED PCB: Using 1.6mm thick double sided board PCB, 2.0 oz copper thickness, to ensure good passage of large and small currents.5. REASONABLE WIRING: The tube preamplifier module has reasonable wiring, low current noise, and adds green background LED, beautiful and sturdy.Specification:Item Type: Preamplifier BoardVoltage: AC 12V (15W)Size (L X W X H): Approx. 165 x 62 x 32mm / 6.5 x 2.4 x 1.3in.Package List:1 x Preamplifier BoardNote:All tubes must be removed when connecting the power supply.