Jrifedptry Buffer HiFi 6J5 Bluetooth 4.2 Tube Preamp Amplifier Stereo Preamplifier with Treble Bass Tone Ajustment(Silver)

3. The resistor uses high-precision chip resistor to a good signal-to-noise ratio of the whole machine. 1. Using 6J5 tube, NE5532 4. PCB adopts 1.6mm thick double-sided sheet, 2.0 oz copper thickness, and tin-spraying process to good passing performance of large and small currents. First-class PCB quality. 2. The capacitor uses the 470UF/25V, and the coupling capacitor uses the capacitor 1UF. 5. The input and output are made of gold-plated lotus seat, which is and beautiful! The board layout is reasonable, beautiful, and the current is small.