The Ibanez TS-9 is one of the Tube Screamer series of overdrive pedals. Designed to recreate the sound of a vintage tube amp, the TS-9 has three control knobs: drive, tone knob, and level. The drive knob is for gain, the tone knob adjusts treble and the level knob adjusts the overall output volume. The TS-9 was introduced in 1982 as part of the Ibanez 9-series. Internally it is very similar to the TS-808 pedal, but the TS-9 has a much larger footswitch. The TS-9 also has a different output circuit to the TS-808 making it slightly brighter. The original TS-9 was discontinued in 1984. In the early 1990s used TS-9s were selling for 100s of dollars - so it was no surprise when in 1992 Ibanez decided to reissue the TS-9. The reissues are a faithful copy of the original pedals.

Sources: Analogman Tube Screamer , Premier Guitar history of the TS