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KSA50 Class A amplifier PCB gold seal plastic speaker protection integrated generic version

Name] imitation KSA-50 Class A amplifier PCB [PCB size] 302 * 91.3 * 2.0mm (length X width X thickness) Materia PCB FR4 fiberglass board Copper 2.0 Oz Surface treatment HAL Color] blue PCB And finished second plate of the PCB board, because there is no so much time dispensing kit components are not yet available, the second version of the PCB has the following characteristics: 1 board to the long bar, the power tube on one side of the installation, due to the power tube installed in the bottom of the heat sink, so more conducive to power tube heat; 2 integrated speaker protection, reducing installation time machine alignment; 3 TO-3 package compatible board gold sealed tube and TO-264 plastic pipe, choose more diverse; 4 board with a mirror-symmetrical design, installation is more clean, convenient. 5 power output terminal electron using inserts, plug more convenient, secure access. 6 In the bottom of the board placeholder necessary voltage and current level separate power supply requires only a little change can; 7 increased LOWBIAS (low bias) selector switch, you can easily use switch Pure Class and Class AB operation. (This is an optional feature is not required! If you do not consider the two states, just by an adjustable resistor R126 can also be transferred quiescent current is large, when the switch is open LOWBIAS, R144 is vacant does not work) 8 wide thick copper traces, to ensure the smooth flow of a large current. BOM: (BOM in red font when using the alternative DALE resistors resistance, of course, if you can find the same with black lettering DALE resistance the better)