Tubes / semiconductors by category - Manufacturer
Selected: Penton Engineering Co.; London
| Name | Maker | Year | User | Usage | Type | Base |  |
 |
 |
 |
 |
 |
 |
 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HE4 | Penton Eng | 1924 | Radio/TV-r | RF/IF-Sta | Triode, | Europe | 1 | – | – | – | – | – | – | |
| HE6 | Penton Eng | 1924 | Radio/TV-r | Universal | Triode, | Europe | 1 | – | – | – | – | – | – | |
| R_England | Common typ | 1916 | Radio/TV-r | Universal | Triode, | Europe | 1 | 8 | 2 | – | 4 | – | 130 | |
3 tubes or semiconductors found.