| Type | Substitutes | Base Diagram |
|---|---|---|
| 1L4 | 1T4, 1AE4* |  |
| Notes: | * - Parallel filaments | |
| Web References | 1L4 (Mazda-Belvu) @ Franks Electron Tubes 1L4 (RCA (HB3)) @ Franks Electron Tubes 1L4 (Tung-Sol) @ Franks Electron Tubes 1L4 (Brimar) @ Franks Electron Tubes 1L4 @ RadioMuseum.org | |
| Bulb | T-51/2 |
| Outline | 5-2 |
| Base1 | Miniature Button 7-Pin |
| Basing | 6AR |
| Mounting Position | Any |
| Filament Voltage D C | 1.4 | Volts |
| Filament Current | 50 | Ma |
| Filament Voltage D C (Abs Max) | 1.6 | Volts |
| Plate Voltage | 90 | 90 | Volts |
| Grid No. 2 Voltage | 67.5 | 90 | Volts |
| Grid No. 1 Voltage | 0 | 0 | Volts |
| Plate Current | 2.9 | 4.5 | Ma |
| Grid No. 2 Current | 1.2 | 2.0 | Ma |
| Transconductance | 925 | 1025 | �mhos |
| Plate Resistance | 0.6 | 0.35 | Megohm |
| Grid No. 1 Bias Ib = 10 �a | -6.0 | -8.0 | Volts |