| Clue | Answer | |
|---|---|---|
|
|
||
| The D in LED (5) | ||
| Certain bulb component (5) | ||
| Electron tube (5) | ||
| Vacuum tube type (5) | ||
There are 2 solutions. The longest is TRIODE with 6 letters, and the shortest is DIODE with 5 letters.
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Solutions are between 5 and 6 letters long.