Potential answers for "Old vacuum tube"

⭐⭐⭐⭐ TRIODE
⭐⭐⭐ ELECTRODE
⭐⭐⭐ MAGNETRON
⭐⭐⭐ ARGON
⭐⭐⭐ DYNODE
⭐⭐⭐ ANODES
⭐⭐⭐ THORIUM

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