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A hybrid amplifier is an audio amplifier that combines two or more different types of amplification technologies. Typically, a hybrid amplifier will use a solid-state amplifier circuit for the preamp stage and a tube amplifier circuit for the power amp stage.

The preamp stage of a hybrid amplifier is responsible for processing the incoming audio signal and preparing it for amplification. Solid-state preamps are known for their low noise and distortion characteristics, which makes them well-suited for this stage of the amplifier.

The power amp stage of a hybrid amplifier is responsible for actually amplifying the audio signal and driving the speakers. Tube power amps are known for their warm and natural sound, which makes them a popular choice for this stage of the amplifier.

By combining the two types of amplification technologies, a hybrid amplifier can provide the best of both worlds: the low noise and distortion of a solid-state preamp and the warm and natural sound of a tube power amp. Additionally, hybrid amplifiers are often more reliable and easier to maintain than full-tube amplifiers, since the solid-state preamp stage requires less maintenance.

Overall, hybrid amplifiers are a popular choice for audiophiles who want the best of both solid-state and tube amplification technologies. They are often considered a good compromise between the two, offering a unique sound that can be tailored to the listener's preferences.