Instrument and Vocal Amplification
Valve amplifiers for guitars (and to a lesser degree vocals and other applications) have different purposes from those of hi-fi amplifiers. The purpose is not necessarily to reproduce sound as accurately as possible, but rather to fulfill the musician's concept of what the sound should be. For example, distortion is almost universally considered undesirable in hi-fi amplifiers but may be considered a desirable characteristic in performance.
Small signal circuits are often deliberately designed to have very high gain, driving the signal far outside the linear range of the tube circuit, to deliberately generate large amounts of harmonic distortion. The distortion and overdrive characteristics of valves are quite different from transistors (not least the amount of voltage headroom available in a typical circuit) and this results in a distinctive sound. Amplifiers for such performance applications typically retain tone and filter circuits that have largely disappeared from modern hi-fi products. Amplifiers for guitars in particular may also include a number of "effects" functions.
Read more about this topic: Valve Audio Amplifier
Famous quotes containing the words instrument and/or vocal:
“English audiences of working people are like an instrument that responds to the player. Thought ripples up and down them, and if in some heart the speaker strikes a dissonance there is a swift answer. Always the voice speaks from gallery or pit, the terrible voice which detaches itself in every English crowd, full of caustic wit, full of irony or, maybe, approval.”
—Mary Heaton Vorse (1874–1966)
“The sound of tireless voices is the price we pay for the right to hear the music of our own opinions. But there is also, it seems to me, a moment at which democracy must prove its capacity to act. Every man has a right to be heard; but no man has the right to strangle democracy with a single set of vocal chords.”
—Adlai Stevenson (1900–1965)