The 4CV50,000E is characterized by low input and feedback capacitances and low internal lead inductances. A rugged thoriated tungsten mesh filament provides adequate emission over long operating life. It is recommended for use as a Class C RF amplifier or oscillator, a Class AB RF linear amplifier, or a Class AB push-pull AF amplifier or modulator. The 4CV50,000E is also useful as a plate and screen modulated Class C RF amplifier.