original: Tube sound (or valve sound) is the characteristic sound associated with a vacuum tube-based audio amplifier.
simplifications: Tube sound is the characteristic sound associated with a vacuum tube-based audio amplifier. Tube sound is the sound of a vacuum tube-based audio amplifier. Tube sound (or valve sound) is the distinct sound of a vacuum tube-based audio amplifier. Tube sound  is also known as or valve sound. It is the usual sound with a vacuum tube-based audio amplifier. The sound created by using a vacuum tube as an aduio amplifier is known as tube sound. Tube sound is the sound made by a vacuum tube-based audio amplifier. Tube sound is the sound associated with an audio amp. Vacuum tube-based audio amplifiers have a characteristic sound know as Tube or valve sound. Tube/ valve sound is associated with a vacuum tube-based audio amplifier. Tube sound (or valve sound) was the characteristic sound of a vacuum tube-based audio amplifier.