49美元造一台电子管功放，邻居说这声音简直有毒！

This period is the electronic tube before the class +D power amplifier, do not know how you feel the effect?I am quite satisfied with this work.However, the cost of this thing is only about 300 yuan after all, which is not comparable with thousands of appointed items, so I hope everyone can watch the movie rationally. The so-called "sound quality is one cent for a penny, two cents for a dime, and three cents for a dollar", I hope to achieve two cents for three cents. Please wear headphones for the listening part, otherwise you won't be able to hear anything. Recording equipment is limited, the feeling for the bass recording is not quite in place, you can imagine their own 3~4dB.