| Type | Substitutes | Base Diagram |
|---|---|---|
| 5U4GB | 5AS4A, 5AS4, 5AU4, 5DB4, 5V3, 5V3A, 5AS4A/5U4GB |  |
| Web References | 5U4GB (RCA (HB3)) @ Franks Electron Tubes 5U4GB (RCA (RC30)) @ Franks Electron Tubes 5U4GB @ RadioMuseum.org | |
| Bulb | T-12 |
| Base | Short Medium Shell Octal 5-Pin |
| Basing | 5T |
| Mounting Position1 | Any |
| Filament Voltage | 5.0 | Volts |
| Heater Current | 3.0 | Amps |
| Peak Inverse Plate Voltage | 1550 | Volts |
| AC Plate Supply Voltage Each Plate (RMS) | * | See Rating Chart I |
| DC Output Current Each Plate | * | See Rating Chart I |
| Steady State Peak Plate Current Each Plate5 | 1.0 | Amperes |
| Transient Peak Plate Current Each Plate6 | 4.6 | Amperes |
| Tube Conducting 225Ma Each Plate | 44 | Volts |
| Tube Conducting 275Ma Each Plate | 50 | Volts |
| Tube Conducting 300Ma Each Plate | 54 | Volts |
| AC Plate Supply Voltage Each Plate (RMS)4 | 300 | 450 | Volts |
| Filter Input Capacitor | 40 | 40 | �f |
| Effective Plate Supply Resistance Each Plate | 21 | 67 | Ohms |
| DC Output Current | 225 | 275 | Ma |
| DC Output Voltage at Filter Input | 290 | 460 | Volts |
| AC Plate Supply Voltage Each Plate (RMS)4 | 550 | Volts |
| Filter Input Choke | 10 | 10 |
| DC Output Current | 275 | Ma |
| DC Output Voltage at Filter Input | 420 | Volts |
| 1 | Horizontal operation is permitted if Pins 1 and 4 are in a vertical plane. |
| 2 | See Rating Charts which represent boundry conditions of operation, operation beyond the boundries is not permitted. |
| 3 | For use with sinusiodal supply voltages within the frequency range of 25 to 1000 cps. |
| 4 | AC plate voltage is measured without load |
| 5 | See Rating Chart II |
| 6 | See Rating Chart III |
