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一、设计的意图打算设计制作一台采用4DC方式的功率放大器。所谓的4DC方式是指将输出管的控制栅极(G)和帘栅极(G)的直流电位分12离,并从G和G同时送入信号的全直流耦合方式。打算对现有的一12台旧KT88立体声功率放大器加以改造,为了节省成本尽量利用可用的元器件。对于4DC电路来说,真空管的帘栅极电压比板极电压低的管子更容易使用。根据这一条件KT88不适合用做输出管,电视机用
First, the intent of the design intends to design and produce a 4DC power amplifier. The so-called 4DC method refers to the output tube control grid (G) and the screen grid (G) of the DC potential points 12 and from G and G simultaneously into the signal full DC coupling. Intends to transform the existing 12-old KT88 stereo power amplifier to make full use of the available components for cost savings. For 4DC circuits, tubes with a lower grid voltage than vacuum tubes are easier to use. According to this condition KT88 is not suitable for use as output tube, TV use