What input amplitude parameter is most valuable in evaluating a Class A amplifier?

In evaluating a Class A amplifier, the peak voltage is the most valuable input amplitude parameter because it directly impacts the maximum output voltage that the amplifier can deliver. Class A amplifiers operate in a linear region, where they amplify input signals continuously, making the peak voltage a critical factor in determining how well the amplifier can handle large signal variations without distortion.

The peak voltage provides insight into the maximum excursion of the signal, which is essential for ensuring that the amplifier can faithfully reproduce the input waveform without clipping. In contrast, while RMS voltage provides a measure of the signal power, it does not give complete insight into the waveform peaks that may influence performance during high-voltage situations. Average voltage can sometimes be relevant but does not specifically address the dynamic range capabilities of the amplifier. Continuous voltage can refer to varying parameters in other contexts but lacks the specific importance associated with peak handling in a Class A configuration. Hence, focusing on peak voltage allows for a better assessment of the amplifier's performance and capability.