Potential answers for "Gas in a vacuum tube"

⭐⭐⭐⭐ ARGON
⭐⭐⭐ TRIODE
⭐⭐⭐ ELECTRODE
⭐⭐⭐ NEON
⭐⭐⭐ MAGNETRON
⭐⭐⭐ DYNODE

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