General › G4 Amateur Radio Practices › G4A04
G4A04
What is the effect on plate current of the correct setting of a vacuum-tube RF power amplifier's TUNE control?
Pick an answer to check it.
Answer: B. A pronounced dip
When the TUNE control of a tube amplifier is set correctly, the output circuit is at resonance and plate current shows a pronounced dip. A peak would mean it is off resonance.
Tip: Tune for the dip.