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沙巴(SABA)54cm(21英寸)彩电与汤姆逊51cm(20英寸)彩电一样,其自举开关稳压电路中升压管BU807极易损坏。有关BU807电路如图1所示。笔者在更换此管时,原先只想按同型号换上,但到处去买BU807也未买到。据有关资料介绍,用国产达林顿管FD30代换可成功,但同样也未买到。前车之鉴又不敢轻易用其他元件代换,使维修陷入困境。后来静下心分析BU807的工作状态,得知BU807工作在开关状态,频率为行频。而有些黑白电视机,如飞跃35D1—4型机用3DD15C做行输出管,而此管不就是工作在行频状态下吗?查阅了3DD15系列大功率三极
Sabah (SABA) 54cm (21 inch) color TV and Thomson 51cm (20 inch) color TV, the bootstrap power regulator boost tube BU807 easily damaged. About BU807 circuit shown in Figure 1. When I replace this tube, originally just want to put on the same model, but everywhere to buy BU807 did not buy. According to the information introduced, with the domestic FDL30 Darlington substitution can be successful, but also did not buy. A lesson from experience is not easy to replace with other components, so that maintenance in trouble. Then calmly analyze the working status of BU807, that BU807 work in the switch state, the frequency of the line frequency. And some black and white TV, such as leap 35D1-4 machine with 3DD15C line output tube, and this tube is not working in the line frequency state? Access to the 3DD15 series of high-power triode