| Type | Substitutes | Base Diagram |
|---|---|---|
| 1L6 | 1U6, 1U6* |  |
| Notes: | * - Parallel filaments | |
| Web References | 1L6 (Sylvania) @ Franks Electron Tubes 1L6 (Tung-Sol) @ Franks Electron Tubes 1L6 (Sylvania) @ Franks Electron Tubes 1L6 @ RadioMuseum.org | |
| Bulb | T-51/2 |
| Outline | 5-2 |
| Base1 | Miniature Button 7-Pin |
| Basing | 7DC |
| Mounting Position | Any |
| Filament Voltage D C | 1.4 | Volts |
| Filament Current | 50 | Ma |
| Shielded1 | Unshielded | ||
| Grid No. 4 to Plate | 0.36 | 0.46 | ��f |
| Grid No. 2 to Grid No. 4 | 0.24 | 0.24 | ��f |
| Grid No. 1 to Grid No. 4 | 0.19 | 0.19 | ��f |
| R F Input; G4 to All | 7.5 | 7.5 | ��f |
| Oscillator Input: G1 to All Except G2 | 2.2 | 2.2 | ��f |
| Oscillator Output: G2 to All Except G1 | 2.6 | 2.6 | ��f |
| Mixer Output: Plate to All | 12.0 | 7.0 | ��f |
| Grid No. 1 to Plate | 0.10 | 0.15 | ��f |
| Plate Voltage | 110 | Volts |
| Grid No. 3 and 5 Voltage | 65 | Volts |
| Grid No. 3 and 5 Supply Voltage | 110 | Volts |
| Grid No. 2 Voltage (Oscillator Plate) | 110 | Volts |
| Total Cathode Current | 4.0 | Ma |
| Plate Voltage | 90 Volts | |
| Grid No. 2 Voltage (Anode Grid) | 90 | Volts |
| Grid No. 3 and 5 Voltage2 | 45 | Volts |
| Grid No. 4 Voltage (Control Grid) | 0 | Volts |
| Plate Current | 0.5 | Ma |
| Grid No. 3 and 5 Current | 0.6 | Ma |
| Grid No. 2 Current (Anode Grid) | 1.2 | Ma |
| Grid No. 1 Current (O/c. Grid) | 0.035 | Ma |
| Total Cathode Current | 2.35 | Ma |
| Grid No. 4 Circuit Resistance | 1.0 | Megohm |
| Grid No. 1 Circuit Resistance | 0.2 | Megohm |
| Conversion Transconductance G4 at 0 Volts | 300 | �mhos |
| Conversion Transconductance G4 at -3.5 Volts | 10 | �mhos |
| Oscillator Transconductance3 | 550 | �mhos |
| 1 | External shield No. 316 connected to Pin 1. |
| 2 | Obtained preferably by using a properly by-passed dropping resistor of from 45,000 to 75,000 Ohms in series with the B supply. |
| 3 | Not oscillating with Ec1=0V, Eb=90V, Ec3 and 5=45V, Ec2=90V, Ec4=0V. |