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In page Vacuum tube:

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Many guitarists prefer using valve amplifiers to solid-state models, often due to the way they tend to distort when overdriven.[2] Any amplifier can only accurately amplify a signal to a certain volume; past this limit, the amplifier will begin to distort the signal. Different circuits will distort the signal in different ways; some guitarists prefer the distortion characteristics of vacuum tubes. Most popular vintage models use vacuum tubes.[citation needed]