| Type | Substitutes | Base Diagram |
|---|---|---|
| CX299 | 99, UX99, UX199, UX-199_code9, B_CommontypeUSA_Trio, 199_UX, 99UX, 2952, B_CeCo, AX199, 57TX99, 199_Philips, GSX-199, DX199, BX, ER-X199, 199_Ceco, X199, 99X, NU-99X, DC199_UX, A199_Atlas, RayX-199, S99, SX99, SLX199, RH199_UX, WX99, RYB199_UX, SX199, MX199, NX-199, WZX199, G&R199, SX8100 | |
| Web References | CX299 (Cunningham) @ Franks Electron Tubes? CX299 @ Radiomuseum | |