Tube diode with directly or indirectly heated cathode.
具有直接或间接加热的阴极的电子管二极管。
Tube pentode with directly or indirectly heated cathode.
具有直接或间接加热的阴极的电子管五极管。
Tube tetrode with directly or indirectly heated cathode.
具有直接或间接加热的阴极的电子管四极管。
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