| Answer | Crossword Clue |
|---|---|
| IMPLODE | Burst like a vacuum tube |
| TRIODE | A vacuum tube |
| NEON | Light in a vacuum tube. |
| ARGON | Gas in a vacuum tube |
| ANODE | ... dark space (region in a vacuum tube) |
| NEON | It glows red in a vacuum tube. |
| ELEMENT | One of the electrodes in a vacuum tube. |
| NIKOLATESLA | Inventor of an A.C. motor and transformer, X-ray technology, and a vacuum tube amplifier: 2 wds. |
