| Answer | Crossword Clue |
|---|---|
| ELEMENT | One of the electrodes in a vacuum tube. |
| pentodes | vacuum tube having five electrodes, usually a plate, three grids, and a cathode, within the same envelope |
| pentode | vacuum tube having five electrodes, usually a plate, three grids, and a cathode, within the same envelope |
| tetrodes | vacuum tube containing four electrodes, usually a plate, two grids, and a cathode |
| tetrode | vacuum tube containing four electrodes, usually a plate, two grids, and a cathode |
| ATRIODE | One vacuum tube |
| pliotron | any hot-cathode vacuum tube having an anode and one or more grids |
