题目选项分析

Although they are more temperamental and far more expensive than transistor-driven amplifiers, many audiophiles and audio professionals think the warmer, richer tones produced by vacuum-tube-driven amplifiers make them preferable.

Although they are more temperamental and far more expensive than transistor-driven amplifiers, vacuum-tube-driven amplifiers are preferred by many audiophiles and audio professionals because these amplifiers produce warmer, richer tones.