| Type | Substitutes | Base Diagram |
|---|---|---|
| CY1 | UY1_Dario, WT1, TCY1, G2080, UR1, VEG51, MCY1, VCY1, 13U6_Ultron, E20U | |
| Web References | CY1 (Philips) @ Franks Electron Tubes? CY1 (Philips) @ Franks Electron Tubes? CY1 (Philips) @ Franks Electron Tubes? CY1 (Philips) @ Franks Electron Tubes? CY1 (Mullard) @ Franks Electron Tubes? CY1 @ Radiomuseum | |