Adopting a good sound circuit structure, the sound is very delicate and audible, and the midpoint is extremely stable.  The LM4766T bile power amplifier IC has a warm tone, thick bass and bright treble.  Red WIMA input coupling capacitor, the sound quality is super good.  MUR460 fast recovery diode for rectification, dedicated to tube amplifier, the sound is closer to the taste of tube. The filter capacitor adopts the original 35V 680OUF audio custom capacitor For Audio The output adds a red pentagonal copper inductor to eliminate interference and clutter, and the sound quality is purer and more natural.  The resistors are all copper pin resistors  With 2x40W maximum output power output, 2x30W output distortion is only 0.009%, it is recommended to use 3-5 inch/4-8 ohm 10-30W full-frequency speakers  Adopt AC dual 12V-22V power supply, it is recommended to use dual 18V 80W transformers, pure power amplifier, very suitable for multimedia speakers and bookshelf speakers.  PCB size (with heat dissipation) about: 100mm *100mm*55mm