| Type | Substitutes | Base Diagram |
|---|---|---|
| 1A5GT | 1T5, 1C5, 1Q5, 1A5G, 1A5GT/G, 1T5GT |  |
| Web References | 1A5GT (RCA (HB3)) @ Franks Electron Tubes 1A5GT (Sylvania) @ Franks Electron Tubes 1A5GT (Tung-Sol) @ Franks Electron Tubes 1A5GT @ RadioMuseum.org | |
| Bulb | T-9 |
| Base | Dwarf Octal 5-Pin |
| Outline | 9-11 |
| Basing | 6X |
| Mounting Position | Any |
| Filament Voltage D C | 1.4 | Volts |
| Filament Current | 50 | Ma |
| Plate Voltage | 85 | 90 | Volts |
| Grid No. 2 Voltage | 85 | 90 | Volts |
| Grid No. 1 Voltage1 | -4.5 | -4.5 | Volts |
| Plate Current | 3.5 | 4.0 | Ma |
| Grid No. 2 Current | 0.7 | 0.8 | Ma |
| Transconductance | 800 | 850 | �mhos |
| Plate Resistance | 0.3 | 0.3 | megohm |
| Load Resistance | 25000 | 25000 | Ohms |
| Power Output | 100 | 115 | Mw |
| Total Harmonic Distortion | 10.0 | 7.0 | Percent |
| 1 | Self Bias is recommended for battery operation, although it reduces the power output slightly. It makes a separate bias supply unnecessary and allows the bias to decrease in proportion with the decrease in B supply volts with age. |