RioRand DIY AMP LM3886 Pure Post-AMP 68W+68W Amplifier Board Powered by RioRand Advanced Technology The board is 1.6 mm dual-panel design, brass foot precision error of 1% metal film resistor KOA imports, small capacitors ELNA fever and tonic by the Japanese original capacitance, imported 20,000 microfarads capacitor filter. 2% silver solder wire welding.