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== Popular Models ==
The most popular boost pedal is the '''''Ibanez''''' ''Tube Screamer''. '''''Ibanez''''' changed the components used as well as the circuit design throughout its history, and many prefer the original. While Ibanez has since released reissue and hand-wired versions of the original, the '''''Maxon''''' ''OD808'' is identical to the original ''Tube Screamer'' without costing as much as '''''Ibanez''''' charges. Of course, the differences in tone are more likely noticeable when using these pedals for distortion rather than purely as boosts.
Many others have popped up that mimic the basic design of the ''Tube Screamer'' but tweak certain component values, making some strong changes to the tone. The basic principle is to use a high-pass filter to remove some low end and "tighten" the tone, while using a low-pass to trim some extreme highs, and a variable band-pass to dial in the resonant peak that defines the distortion tone. However, the ''Tube Screamer'' is almost always the basis of comparison, due to its high name and tone recognition.