1. Using the original disassembled Sanken tube 2SA1216 2SC2922 brand new op amp OP07

2. The direct coupling test amplification is used in the front, and the whole circuit has no coupling capacitance, which reduces the distortion to 0.01%.

3. High-precision resistors are selected for the resistance, and the main circuit uses high-precision resistors with an accuracy of ±1%, which ensures a good signal-to-noise ratio of the whole machine.

4. The PCB adopts 1.6mm thick double-sided board, 2.0 oz copper thickness, and full tinning process to ensure good passing performance of large and small currents. The PCB quality and the manufacturing process.

5. This board can be debugged as Class A, B or Class A.

6. The sound quality is soft, beautiful and powerful, comparable to LM3886.