| Type | Substitutes | Base Diagram |
|---|---|---|
| REN1004 | W4100, E438, Bi_Zenith, CI438, 4W100, 354VX, 41MRC, 484V, AR4100, AR4101, AR495, DW3559, DW4023, I4078, LWJ4100, NR4, S440N, TE38, VT2_Oxytron, W307_Marathon, WG43 | |
| Web References | REN1004 (Telefunken) @ Franks Electron Tubes? REN1004 (Telefunken) @ Franks Electron Tubes? REN1004 @ Radiomuseum | |