Tubes / semiconductors by category - Manufacturer
Selected: Quadruple Valve Co., Ltd., Nottingham
| Name | Maker | Year | User | Usage | Type | Base |  |
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 |
 |
 |
 |
 |
 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Four-In-One | Quadruple | 1929 | Universal | Quad Tri | SPECIAL | – | 4 | – | 1 | 1 | – | – | ||
| Four-In-One-3 | Quadruple | Universal | Triple T | SPECIAL | – | – | – | – | – | – | – | |||
2 tubes or semiconductors found.