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In electric Rock guitar, attenuators are used as a dummy load by sending all of the power to the power attenuator's built-in, mostly resistive dummy load and none to the speaker, in order to silence or reduce the output volume of an audio amplifier (for example, a guitar amplifier). This page is about amplifiers for musical instruments. ...
Explanation
Silencing an amplifier is useful for biasing the positive and negative signal crossover, for running bench tests such as measuring the amplifier's maximum output wattage, and for adding line-level effects between a guitar amplifier and a guitar speaker.
With guitar amplifiers, power-tube distortion is one of the main purposes of guitar amplifiers, and power attenuators are frequently used essentially for signal processing, as a means of obtaining power-tube distortion at a controlled volume level. A power attenuator is similar to a guitar effects pedal: it provides a useful way of getting a guitar amp to produce distortion for use in musical performance. Left: Rosa Hurricane, a heavy metal-style solid body guitar. ...
It has been suggested that this article or section be merged into Effects unit. ...
Whether set to full dummy load or only partial attenuation, a guitar-amp power attenuator typically offers a line-level output jack to enable recording the distortion-processed signal directly or reamplifying the distortion-processed signal through a larger or smaller amplifier for more or less volume, independently of how much power is being output by the first guitar amplifier's power amp section. Line level is a term used to denote the strength of an audio signal used to transmit analog sound information between audio components such as CD and DVD players, TVs, amplifiers, and mixing consoles. ...
There are two approaches to power attenuation to obtain any desired amount of power-tube distortion at a quiet or independently controllable speaker volume: the power-soak approach and the power-supply reduction approach. In the power-soak approach, the power tubes are pushed into their maximum possible power output, and then the unwanted resulting wattage is directed into the dummy load portion of the power attenuator, which is placed between the output transformer and the guitar speaker, routing only a portion of the output wattage to the guitar speaker.
In the power-supply reduction approach, as with a Variac, Power Scaling, Power Dampening, or Sag circuit, the B+ plate voltage available to the power tubes is reduced, producing power-tube distortion at arbitrarily low output power levels -- the entire resulting output wattage is sent directly to the guitar speaker. This removes power-tube wear, prevents blowing an output transformer, prevents overheating and shutdown, and obviates purchasing and transporting a separate, bulky power attenuator in addition to the guitar amp.
Description A power attenuator or dummy load is either purely resistive, or mostly resistive and partly reactive. The original guitar-amp power attenuator, the Altair Attenuator, was purely resistive, using a toaster coil with low inductance windings. Other models, such as the Marshall Power Brake, add some electrical inductance or capacitance to the electrical load (including fans, light bulbs and coils). There is debate about whether reactive attenuators do a better job of preserving a guitar amplifier's tone. It has been suggested that Electric reactance be merged into this article or section. ...
Altair (α Aql / α Aquilae / Alpha Aquilae / Atair ) is the brightest star in the constellation Aquila and the twelfth brightest star in the nighttime sky, at visual magnitude 0. ...
Inductance (or electric inductance) is a measure of the amount of magnetic flux produced for a given electric current. ...
// Definition Capacitance is a measure of the amount of electric charge stored (or separated) for a given electric potential. ...
Fan may refer to the following: Fan (aficionado) (the bracketed word being the Spanish translation), someone who has an intense liking of a person, group of persons, work of art, idea, or trend. ...
The light bulb is one of the most significant inventions in the history of the human race, illuminating the darkness of the evening and bringing light indoors at all times in order focus on the task at hand. ...
Use of an attenuator can potentially damage an amplifier just as using a speaker as a load can, if you are driving the amplifier into heavy distortion. Some production attenuators are the Rockman Power Soak, the Marshall Power Brake, and the THD Hot Plate. The Marshall Logo Marshall Amplification is a British company which designs and manufactures electric guitar amplifiers. ...
See also Image File history File links Commons-logo. ...
Wikimedia Commons logo by Reid Beels The Wikimedia Commons (also called Commons or Wikicommons) is a repository of free content images, sound and other multimedia files. ...
This page is about amplifiers for musical instruments. ...
An attenuator is an electronic device that reduces the amplitude or power of a signal without appreciably distorting its waveform. ...
In the world of guitar music and guitar amplification, distortion is actively sought, evaluated, and appreciatively discussed in its endless flavors. ...
Soundproofing is any means of to reducing the intensity of sound with respect to a specified source and receptor. ...
External links - Guitar amp power attenuator FAQ
- Basic attenuator circuits
- London Power - Power Scaling circuit design book and kits
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