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Instrument amplifier
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===Tube amplifiers=== Vacuum tubes were the dominant active electronic components in amplifiers from the 1930s through the early 1970s, and tube amplifiers remain preferred by many musicians and [[record producer|producers]]. Some musicians feel that tube amplifiers produce a warmer or more natural sound than solid state units, and a more pleasing [[distortion (music)|overdrive]] sound when overdriven. However, these subjective assessments of the attributes of tube amplifiers' sound qualities are the subject of ongoing debate. Tube amps are more fragile, require more maintenance, and are usually more expensive than solid-state amps. Tube amplifiers produce more heat than solid-state amplifiers, but few manufacturers of these units include cooling fans in the chassis. While tube amplifiers do need to attain a proper [[operating temperature]], if the temperature goes above this operating temperature, it may shorten the tubes' lifespan and lead to tonal inconsistencies.<ref>[https://web.archive.org/web/20061019054109/http://www.chitown.com/http/music/Musictips.html ''Cool it, man''; Michael "Mac" McCullough.]</ref> [[Image:Trace Elliot Bonneville rear view.jpg|thumb |A [[Trace Elliot]] Bonneville tube amplifier as seen from the rear view: note the vacuum tubes extending into the wooden cabinet.]]
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