Tube Substitutions for:
20
Power Triode
| Type | Substitutes | Base Diagram |
|---|---|---|
| 20 |  | |
| Web References | 20 (RCA) @ Franks Electron Tubes 20 @ RadioMuseum.org | |
| Type | Substitutes | Base Diagram |
|---|---|---|
| 20 | | |
| Web References | 20 (RCA) @ Franks Electron Tubes 20 @ RadioMuseum.org | |
| Bulb | T-8 |
| Base | Small 4 Pin |
| Basing | 4D |
| Filament Voltage | 3.3 | Volts |
| Filament Current | 0.132 | Amps |
| Grid-Plate Capacitance | 4.1 | ��f |
| Grid-Filament Capacitance | 2.0 | ��f |
| Plate-Filament Capacitance | 2.3 | ��f |
| Plate Voltage | 90 | 135 | Volts |
| Grid Voltage | -16.5 | -22.5 | Volts |
| Plate Current | 3.0 | 6.5 | Ma |
| Plate Resistance | 8000 | 6300 | Ohms |
| Amplification Factor | 3.3 | 3.3 | x |
| Transconductance | 415 | 525 | �mhos |
| Load Resistance | 9600 | 6500 | Ohms |
| Undistorted Power Output | 0.045 | 0.11 | Watts |