Tube Substitutions for:
2C21
Medium-Mu Twin Triode
| Type | Substitutes | Base Diagram |
|---|---|---|
| 2C21 | 1642 |  |
| Web References | 2C21 (RCA (HB3)) @ Franks Electron Tubes 2C21 @ RadioMuseum.org | |
Medium-Mu Twin Triode
MECHANICAL DATA
| Basing | 7BH |
ELECTRICAL DATA
HEATER CHARACTERISTICS
| Heater Voltage | 6.3 | Volts |
| Heater Current | 0.6 | A |