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前几日,替友人选购了一台PIONEERA—757所谓“仿先锋”功放,透过机壳向里看,可见一只大环牛、一对大电解、2对东芝A1301/C3280功放管,价格不足600元,尽管试机时感觉音质不佳且噪声较大,仍然买下了它。回家试音发现,机器的BBD时钟声及本底交流声非常大。拆开机壳及线路板,才发现其工艺很差,多处可见零碎焊锡及胶块,连线均为劣质排线,线路板布线无科学性且板材
A few days ago, a friend bought a PIONEERA-757 so-called “imitation avant-garde” amplifier, looking through the case inward, we can see a large ring of cattle, a pair of large electrolytic, Toshiba A1301 / C3280 amplifier tube 2, The price of less than 600 yuan, although the test machine feel bad sound quality and larger, still bought it. Home audition found that the machine’s BBD clock sound and background hum is very large. Disassemble the chassis and circuit board, only to find that its technology is poor, many pieces of solder and plastic blocks can be seen, the connection is poor quality cable, wiring board routing science and board