Tube Substitutions for:
257
Power Amplifier Pentode
| Type | Substitutes | Base Diagram |
|---|---|---|
| 257 |  | |
| Web References | 257 @ RadioMuseum.org | |
Power Amplifier Pentode
MECHANICAL DATA
| Basing | 5B |
ELECTRICAL DATA
HEATER CHARACTERISTICS
| Heater Voltage | 5 | Volts |
| Heater Current | 0.3 | A |