| Type | Substitutes | Base Diagram |
|---|---|---|
| AD1 | TAD1, 4A28_Ultron, 4C101, 4D1_TKD, DT14 | |
| Web References | AD1 (Philips) @ Franks Electron Tubes? AD1 (Philips) @ Franks Electron Tubes? AD1 (Telefunken) @ Franks Electron Tubes? AD1 (Philips) @ Franks Electron Tubes? AD1 @ Radiomuseum | |