Related Clues:
- Valve
- Radio valve
- Wretched to ride tube linking three terminals
- Guitar amp part
- Phone flash component
- Current path?
- Early radio component
- Monitor component
- Semiconductor unit
- AC-to-DC converter
- Old TV tube
- Light source for digital clocks
- Tube with two electrodes
- Unidirectional semiconductor
- It may be light-emitting