| Type | Substitutes | Base Diagram |
|---|---|---|
| 201A | 01A, UX201A, CX301A, ER201A, 201, RH201A, LS201A, FX201A, CX201A, GSX401A, 4600, MX201A, JX201A, 3000X1-A, VX201A, HF201A_perfectron, TSX201A, SW201A, LB-201A, P201A, SX01A, SLX201A, XL201A, D201A, G&R201A, NX-201A, ZP201A, BG-201A, RayX-201A, T-201A, TS201A, D-201A, EX201A, Z201A, A_MusicMaster, 201A_Magnavox, 38001, A57 | |
| Web References | 201A (WE) @ Franks Electron Tubes? 201A @ Radiomuseum | |