简述了FC - 308电子管发射腔体的调试过程，包括中和电路的调整、输入回路的调节以及输出回路的调试。
This paper briefly introduces the adjusting process of the emission cavity of FC-308 electronic tube including adjustments of neutralizing circuit, input circuit and output circuit.
每种电源都带有延时继电器，它在电子管进入稳定工作状态之前使输出静音。
Each supply has a timed relay that mutes the audio output until the tubes stabilize.
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