

TS9: From 1981 to 1985, Ibanez produced the "9-series" of overdrive pedals.Some units however had the Malaysian-manufactured Texas Instruments RC4558P chip. It was equipped with the Japanese JRC-4558 chip. TS-808/TS808: The first Tube Screamer, the TS808, was released in the late 1970s.

The green OD-II had a circuit similar to the TS808 however, the OD and OD-II had a more distorted circuit. There was also a reddish "Overdrive-II" which had a housing very similar to the TS-808/TS808. These came in narrower boxes without battery covers. The Tube Screamer pedal was preceded by the orange "Overdrive" (OD) and green "Overdrive-II" (OD-II). The pedal was produced with many variants:

This, along with its versatility as a simple distortion, has made the pedal very popular for a wide variety of styles and situations. Some guitarists prefer this sort of equalization, as it helps to keep their sound from getting lost in the overall audio mix of the band. The pedal also provides a slight boost to mid-range frequencies, helping to reduce muddiness by cutting bass frequencies when used in this way. The Tube Screamer name refers to the pedal's ability to drive the preamp section of a tube amplifier, resulting in more gain from the amp itself. The drive knob adjusts gain (which can affect the amount of distortion), the tone knob adjusts treble and the level knob adjusts the output volume of the pedal. The Tube Screamer has a drive knob, a tone knob, and a level knob.
