Type | Substitutes | Base Diagram |
---|---|---|
1A4 | 1A4P, 1A4T, 1B4, 1B4G, 1B4T, 951, 32, 34, 1C4*, 1K4* | |
Notes: | * - Parallel filaments | |
Web References | 1A4 (RCA) @ Franks Electron Tubes 1A4 (RCA (HB3)) @ Franks Electron Tubes 1A4 @ RadioMuseum.org |
Bulb | ST-12 |
Basing | 4K |
Filament Voltage | 2.0 | Volts |
Filament Current | 0.06 | Amps |
Plate Voltage | 90 | 180 | Volts |
Screen Voltage | 67.5 | 67.5 | Volts |
Grid Voltage | -3.0 | -3.0 | Volts |
Plate Current | 2.2 | 2.3 | Ma |
Screen Current | 0.9 | 0.8 | Ma |
Plate Resistance | 0.6 | 1.0 | Megohm |
Transconductance | 720 | 750 | �mhos |