电视机中的三中放管、视放管功耗都较大,又不易设置散热装置,在业余制作条件下,可在焊接时让管子尽量贴近印制线路板,即将管腿尽量减短(但不应小于5mm)利用印制板上的铜箔散热。实验证明,管腿长约5mm的比未剪腿的3DA87B的壳温低7℃,大大改善了电视的热性能。 TV in the three tubes, depending on the tube power consumption are larger, and not easy to set the cooling device, in the amateur production conditions, the tube can be welded as close as possible to the printed circuit board, pipe legs is about to minimize ( But not less than 5mm) Use the copper foil on the PCB to dissipate heat. Experiments show that the tube leg length of about 5mm than the unmanned leg shell temperature 3DA87B 7 ℃, greatly improving the thermal performance of television.