Tube Substitutions for:
1B4
Pentode Amplifier
| Type | Substitutes | Base Diagram |
|---|---|---|
| 1B4 | 1B4G, 1B4P, 1B4T, 951, 1A4, 1A4P, 1A4T, 32, 34, 1C4*, 1K4* |  |
| Notes: | * - Parallel filaments | |
| Web References | 1B4 (RCA) @ Franks Electron Tubes 1B4 @ RadioMuseum.org | |
| Type | Substitutes | Base Diagram |
|---|---|---|
| 1B4 | 1B4G, 1B4P, 1B4T, 951, 1A4, 1A4P, 1A4T, 32, 34, 1C4*, 1K4* | |
| Notes: | * - Parallel filaments | |
| Web References | 1B4 (RCA) @ Franks Electron Tubes 1B4 @ RadioMuseum.org | |
| Bulb | ST-12 |
| Base | Medium 4 Pin |
| Basing | 4M |
| Filament Voltage | 2.0 | Volts |
| Filament Current | 0.060 | Amps |
| Grid to Plate | 0.0071 | ��f |
| Input | 5 | ��f |
| Output | 11 | ��f |
| Plate Voltage | 90 | 180 | Volts |
| Screen Voltage | 67.5 | 67.5 | Volts |
| Grid Bias | -3 | -3 | Volts |
| Amplification Factor | 600 | 975 | x |
| Plate Resistance | 1 | 1.5 | Megohms |
| Transconductance | 600 | 650 | �mhos |
| Plate Current | 1.6 | 1.7 | Ma |
| Screen Current | 0.7 | 0.6 | Ma |
| Grid Bias for Plate Current Cutoff | -8 | -8 | Volts |
| 1 | With tube shield. |