| Answer | Crossword Clue |
|---|---|
| DIODE | Type of rectifier tube. |
| DIODE | Vacuum tube rectifier. |
| TEST | Type of tube |
| INNER | Type of tube |
| BOOB | Type of tube |
| INNER | Type of tube. |
| MAGNETRON | Type of vacuum tube |
| TRIODE | Type of vacuum tube |
| BUNDT | Type of tube pan |
| DIODE | Type of electron tube |
| CATHODERAY | Type of electronic tube |
| KINESCOPE | Type of TV tube |
| TETRODE | Type of vacuum tube |
| INNER | Type of circle or tube |
| INNER | Type of ear or tube |
