Medium-Mu Twin Triode >
The 1642 / 2C21 Vacuum tube is a double triode intended for operation as a low-power class-C
amplifier or oscillator at frequencies up to 60MHz.
Electrical Data:
Filament Voltage .............................. 6.3 V
Filament Current .............................. 0.6 A
Preferred Substitutes ........................ 2C21, 1642