Tube Substitutions for:
25L6G
Beam Power Amplifier
| Type | Substitutes | Base Diagram |
|---|---|---|
| 25L6G | 25L6, 25L6GT, 25L6GT/G, 25W6GT |  |
| Web References | 25L6G (Sylvania) @ Franks Electron Tubes 25L6G @ RadioMuseum.org | |
| Type | Substitutes | Base Diagram |
|---|---|---|
| 25L6G | 25L6, 25L6GT, 25L6GT/G, 25W6GT | |
| Web References | 25L6G (Sylvania) @ Franks Electron Tubes 25L6G @ RadioMuseum.org | |
| Bulb | ST-12 |
| Base | Octal 7-Pin |
| Basing | 7S |
| Mounting Position | Any |
| Heater Voltage | 25 | Volts |
| Heater Current | 300 | Ma |
| Maximum Heater-Cathode Voltage | 90 | Volts |
| Plate Voltage | 200 | Volts |
| Plate Dissipation | 10 | Watts |
| Grid No. 2 Voltage | 125 | Volts |
| Grid No. 2 Dissipation | 1.25 | Watts |
| Grid No. 1 Circuit Resistance-Cathode Bias | 0.5 | Megohm |
| Grid No. 1 Circuit Resistance-Fixed Bias | 0.1 | Megohm |
| Plate Voltage | 110 | 200 | Volts |
| Grid No. 2 Voltage | 110 | 125 | Volts |
| Grid No. 1 Voltage | -7.5 | Volts | |
| Cathode Bias Resistor1 | 0 | 180 | Ohms |
| Peak A F Grid No. 1 Voltage | 7.5 | 8.5 | Volts |
| Plate Current (Zero Signal) | 49 | 46 | Ma |
| Grid No. 2 Current (Zero Signal) | 4.0 | 2.2 | Ma |
| Plate Current (Maximum Signal) | 50 | 47 | Ma |
| Grid No. 2 Current (Maximum Signal) | 10.0 | 8.5 | Ma |
| Transconductance | 8000 | 8000 | �mhos |
| Plate Resistance (approx.) | 13000 | 28000 | Ohms |
| Load Resistance | 2000 | 4000 | Ohms |
| Power Output | 2.1 | 3.8 | Watts |
| Total Harmonic Distortion (approx.) | 10 | 10 | Percent |
| 1 | Fixed bias operation at maximum ratins is not recommended. |