Potential answers for "Tube type"

⭐⭐⭐⭐ TRIODE
⭐⭐⭐⭐ INNER
⭐⭐⭐⭐ VACUUM
⭐⭐ DIODE
⭐⭐ MAGNETRON
⭐⭐ CATHODERAY
⭐⭐ TEST

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