Tube Substitutions for:
QB309
| Type | Substitutes | Base Diagram |
|---|---|---|
| QB309 | 12AT7WA, 12AT7WB, 12AZ7*, 6060, 6201, 6671, 6679, 7492, 7728, A2900, 12AT7 |  |
| Notes: | * - Parallel filaments |
MECHANICAL DATA
| Basing | 9A |
| Type | Substitutes | Base Diagram |
|---|---|---|
| QB309 | 12AT7WA, 12AT7WB, 12AZ7*, 6060, 6201, 6671, 6679, 7492, 7728, A2900, 12AT7 | |
| Notes: | * - Parallel filaments |
| Basing | 9A |