ac square filament power supply 交流方波灯丝电源
The principle of a new AC filament power and its implementation method are introduced in the paper.
介绍了一种新型的交流灯丝电源的基表原理，描述了其实现方法，最后给出了实验波形。
About the power supply, the filaments can be powered by AC or DC except that the 3a5 (version 2 of the amplifier) requires a DC filament supply.
就电源而言，灯丝用交、直流供电均可，但是版本二中的3a5除外，它必须用直流供电。
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