Tube Substitutions for:
12A
Detector Amplifier
| Type | Substitutes | Base Diagram |
|---|---|---|
| 12A | 12A/112A, 112A |  |
| Web References | 12A (Sylvania) @ Franks Electron Tubes 12A @ RadioMuseum.org | |
| Type | Substitutes | Base Diagram |
|---|---|---|
| 12A | 12A/112A, 112A | |
| Web References | 12A (Sylvania) @ Franks Electron Tubes 12A @ RadioMuseum.org | |
| Bulb | S-14 |
| Base | Medium 4 Pin |
| Basing | 4D |
| Filament Voltage | 5.0 | Volts |
| Filament Current | 0.25 | Amps |
| Grid-Plate Capacitance | 8.5 | ��f |
| Grid-Filament Capacitance | 4.0 | ��f |
| Plate-Filament Capacitance | 2.0 | ��f |
| Plate Voltage | 90 | 135 | 180 | Volts |
| Grid Voltage | -4.5 | -9.0 | -13.5 | Volts |
| Plate Current | 5.0 | 6.2 | 7.7 | Ma |
| Plate Resistance | 5400 | 5100 | 4700 | Ohms |
| Amplification Factor | 8.5 | 8.5 | 8.5 | x |
| Transconductance | 1575 | 1650 | 1800 | �mhos |
| Load Resistance | 5000 | 9000 | 10650 | Ohms |
| Undistorted Power Output | 0.035 | 0.13 | 0.285 | Watts |