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Distortion Ibanez

The Ibanez Tube Screamer is a distortion effects pedal produced by Ibanez. It is one of the most famous overdrive pedals, and is named for the fact that its light distortion is similar to the sound given by overdriven tube amps. more...

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The pedal can be used on a solid-state amp to try to mimic the sound of a vintage tube amp, although many guitarists prefer to use it to push a tube amp's preamp tubes into an overdriven state. The classic Tube Screamer sound includes a "mid-hump," which means that the circuit accentuates freqencies between the bass and treble ranges (mid-frequencies). Many guitarists prefer this sort of equalization, as it helps to keep their sound from getting lost in the overall mix of the band.

The pedal was produced with many variants. The early incarnations of the TS-808 and TS-9 are the most sought after by collectors, due in part to the fact that Stevie Ray Vaughan is known to have used them as part of his signature sound. Other variants, including the TS-10, TS-7, and TS-5 are less collectible, but contain a nearly identical underlying circuit.

The TS-9 and TS-808 pedals have been reissued, but not all of these reissues are using the same parts (chips) that helped to shape the famous tubescreamer sound. Some musicians are having a technician perform modifications to the circuit to improve the sound. In addition, a number of other effects manufacturers make versions of the Tube Screamer circuit, including Maxon (who produced the original Tubescreamer pedals for the Ibanez brand in the seventies and early eighties). In addition, many of the most highly-regarded overdrive pedals, both mass-manufactured and boutique, owe their heritage to the Tube Screamer circuit.

This is generally one of the few pedals that Carlos Santana uses, both in his performances and recordings, and it is perhaps one of the most popular pedals to be seen on pedalboards of gigging musicians.

The Tube Screamer has a drive knob, a tone knob, and a level knob. The drive knob controls distortion, the tone knob adjusts the amount of treble in the sound, and the level knob controls the output volume of the pedal.

How it works

The circuit uses transistor buffers at both the input and the output. The overdrive is produced using a variable gain op-amp circuit with diodes in the feedback circuit to produce soft clipping of the input waveform. The overdrive stage is followed by a simple lowpass filter and active tone control circuit and volume control. This circuit is unexceptional, and the success of the Tube Screamer's sound probably has more to do with intelligent selection of tone shaping elements (particularly capacitor values) throughout the circuit.

The Tube Screamer uses electronic FET switching.