Tube Substitutions for:
DK91
HEPTODE
| Type | Substitutes | Base Diagram |
|---|---|---|
| DK91 | 1AQ5*, 1R5SF*, 1R5 |  |
| Notes: | * - Parallel filaments | |
| Web References | DK91 (Philips) @ Franks Electron Tubes DK91 (Philips) @ Franks Electron Tubes DK91 @ RadioMuseum.org | |
HEPTODE
MECHANICAL DATA
| Basing | 7AT |