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Once Ibanez discontinued the 9 series pedals, they introduced the "Master" or "L" series.These were only made in 1985, and did not have the Tube Screamer in the line-up.The Ibanez Tube Screamer is a guitar overdrive pedal, made by Ibanez.The pedal has a characteristic mid-boosted tone popular with blues and rock players.The drive knob adjusts gain, the tone knob adjusts treble and the level knob adjusts the output volume of the pedal.The pedal is used to try to mimic the sound of a vintage tube amplifier.(See Op-amp swapping.) The pedal was popularized by Stevie Ray Vaughan.Phish guitarist Trey Anastasio implements two TS9 Tube Screamers in his rig.
This is mathematically equivalent to mixing the input signal with a clipped version of itself, however.In doing so, he used an innovative circuit, using the monolithic operational amplifier device, introduced in early 70s, to create a pedal sound different from the "discrete" transistorized 60's fuzzes.The overdrive is produced using two silicon diodes in anti-parallel arrangement into the negative feedback circuit of a operational amplifier ("op-amp") circuit, to produce soft, symmetrical distortion of the input waveform.Some musicians have a technician perform modifications to the unit to change the sound to their liking.Also, Maxon, who produced the original Tube Screamer pedals for the Ibanez brand in the 1970s–1980s, produce their own version of the Tube Screamer (called Overdrives: the OD-808 and OD-9 as opposed to Tube Screamer, TS).