| Type | Substitutes | Base Diagram |
|---|---|---|
| REN904 | 41MHF, RV4100, MH4, DW4011, RS4324, TL425, A4110, AG495, A430N, TE24, 70504, E428, WG43, D4, ND4_Orion, 904, 105, E424N, A4D1, NU41, WE27, CI424, LA203, 4A6_Ultron, A4090, 41MH, 4A120, 4A80/n, 4C2_5pin, 4C3, 4W120, Dn254, Dn284, E424, E438M, KL70503, NU4, U41W, VT1_Oxytron, WG42 | |
| Web References | REN904 (Telefunken) @ Franks Electron Tubes? REN904 (Telefunken) @ Franks Electron Tubes? REN904 @ Radiomuseum | |