Tube Substitutions for:
DF91
Vacuum Pentode
| Type | Substitutes | Base Diagram |
|---|---|---|
| DF91 | 1AE4*, 1AF4*, 1AJ4*, 1AM4*, 1T4SF*, 1T4 |  |
| Notes: | * - Parallel filaments | |
| Web References | DF91 (Mullard) @ Franks Electron Tubes DF91 (Mullard) @ Franks Electron Tubes DF91 @ RadioMuseum.org | |
Vacuum Pentode
MECHANICAL DATA
| Basing | 6AR |