Classical music. According to information related to push-pull tube amps, it is suitable for classical music because the sound of tube amps is relatively warm, the sound is sweet, soft, natural and friendly, and the timbre is sweet and moving. A tube amplifier refers to a tube audio amplifier. Some tubes are used for power amplification, and some are used for polishing, that is, voltage amplification. The tube amplifier has its own unique "bold flavor", the sound is warm and durable, the music feels good, and the atmosphere is good.