Potential answers for "Certain electron tube"

⭐⭐⭐⭐ TRIODE
⭐⭐⭐ DIODE
⭐⭐⭐ TETRODE
⭐⭐⭐ TRIODES
⭐⭐⭐ ANODES
⭐⭐⭐ KLYSTRON

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