original: tube sound -lrb- or valve sound -rrb- is the characteristic sound associated with a vacuum tube-based audio amplifier .
simplifications: tube sound -lrb- or valve sound -rrb- is the sound that comes from a vacuum tube-based audio amplifier . tube sound is the characteristic sound associated with a vacuum tube-based audio amplifier . tube sound -lrb- or valve sound -rrb- is the normal sound heard with a vacuum tube-based audio amplifier . tube sound -lrb- or valve sound -rrb- is the sound that vacuum tube-based audio amplifiers are known to make . tube sound -lrb- or valve sound -rrb- is the normal sound associated with a vacuum tube-based audio amplifier . tube sound -lrb- or valve sound -rrb- is the typical sound related with a vacuum tube-based audio amplifier -lrb- an electronic device for increasing the amplitude of electrical signals , used chiefly in sound reproduction -rrb- . tube sound -lrb- or valve sound -rrb- is the characteristic sound associated with a vacuum tube-based audio amplifier . tube sound -lrb- or valve sound -rrb- is the characteristic sound spent time with / related to a vacuum tube-based audio sound system equipment / increaser .