Tube Substitutions for:
1221
Vacuum Pentode
| Type | Substitutes | Base Diagram |
|---|---|---|
| 1221 | 6C6 |  |
| Web References | 1221 (Sylvania) @ Franks Electron Tubes 1221 @ RadioMuseum.org | |
Vacuum Pentode
MECHANICAL DATA
| Basing | 6F |
| Type | Substitutes | Base Diagram |
|---|---|---|
| 1221 | 6C6 | |
| Web References | 1221 (Sylvania) @ Franks Electron Tubes 1221 @ RadioMuseum.org | |
| Basing | 6F |