Potential answers for "Type of tube"

⭐⭐⭐⭐ INNER
⭐⭐⭐⭐ TEST
⭐⭐⭐⭐ BOOB
⭐⭐⭐⭐ DIODE
⭐⭐ TRIODE
⭐⭐ MAGNETRON
⭐⭐ CATHODERAY

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