Tube Substitutions for:
X99
Detector Amplifier Triode
| Type | Substitutes | Base Diagram |
|---|---|---|
| X99 |  | |
| Web References | X99 (RCA) @ Franks Electron Tubes X99 (RCA (HB3)) @ Franks Electron Tubes X99 (Sylvania) @ Franks Electron Tubes X99 @ RadioMuseum.org | |
| Type | Substitutes | Base Diagram |
|---|---|---|
| X99 | | |
| Web References | X99 (RCA) @ Franks Electron Tubes X99 (RCA (HB3)) @ Franks Electron Tubes X99 (Sylvania) @ Franks Electron Tubes X99 @ RadioMuseum.org | |
| Bulb | T-8 |
| Base | Small 4 Pin |
| Basing | 4D |
| Filament Voltage | 3.3 | Volts |
| Filament Current | 0.063 | Amps |
| Grid-Plate Capacitance | 3.3 | ��f |
| Grid-Filament Capacitance | 2.5 | ��f |
| Plate-Filament Capacitance | 2.5 | ��f |
| Plate Voltage | 90 | Volts |
| Grid Voltage | -4.5 | Volts |
| Plate Current | 2.5 | Ma |
| Plate Resistance | 15000 | Ohms |
| Amplification Factor | 6.6 | x |
| Transconductance | 425 | �mhos |