From to , Ibanez produced the "9-series" of overdrive pedals. Notable users[ edit ] The pedal was popularized by Stevie Ray Vaughan. The TS7 allows switching between a "TS9" mode, in which the circuit and all relevant component values are identical to the vintage model, and a "Hot" mode, which introduces an additional gain stage. The TS9 and TS pedals have been reissued, and according to the company, feature the same circuitry, electronics and design components that helped shape the famous Tube Screamer sound. These were only made in , and did not have the Tube Screamer in the line-up.
The TS10 had three times as many changes to the circuit than the TS9 had had. The classic Tube Screamer sound includes a "mid-hump", which means that the circuit accentuates frequencies between the bass and treble ranges mid-frequencies. The TS9 Tube Screamer is almost the same internally as the TS but the TS9 had a different output, which caused the pedal to sound brighter and less smooth. However, these plastic versions still have a shielded and grounded metal bottom plate for a slight interference reduction plus the needed weight to keep the pedal from sliding because of its light weight. The original based circuit uses transistor buffers at both the input and the output, to improve impedance matching. This is weak point in the design sometimes causing the jacks to break off. The drive knob adjusts gain, the tone knob adjusts treble and the level knob adjusts the output volume of the pedal. It was made in Taiwan like the TS5, but in an aluminum case that was more durable. 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. These came in narrower boxes without battery covers. HW is encased in a dark green, heavy duty metal box. The TS9 and TS pedals have been reissued, and according to the company, feature the same circuitry, electronics and design components that helped shape the famous Tube Screamer sound. The circuit inside had a "hot" mode switch for extra distortion and volume. Notable users[ edit ] The pedal was popularized by Stevie Ray Vaughan. A "drive" potentiomenter in the feedback path provides variable gain. JRCD op-amp[ edit ] Much has been made of the operational amplifier chips used in the various versions of the Tube Screamer pedal, and several "fairy tales" about the merits of these devices have been written on the subject. Also, Maxon , who produced the original Tube Screamer pedals for the Ibanez brand in the s—s, produce their own version of the Tube Screamer called Overdrives: The circuit uses transistor buffers at both the input and the output, and a modern electronic field-effect transistor FET "noiseless" bypass switching to turn the effect on and off. Description[ edit ] The Tube Screamer has a drive knob, a tone knob, and a level knob. All TS10s as well as other L and series pedals used floating jacks and pots, which were mounted to the boards instead of the cases. Thought of this way, it is said that this "preserves the original dynamics of the input signal which otherwise would get lost at the threshold of clipping" and "avoids muddiness and vastly improves clarity and responsiveness. It is also used by the majority of metal guitarists before the lead channel of the high gain amps to make distortion more focused and to cut the low end. It is widely used in genres as diverse as country, blues and metal. Some musicians have a technician perform modifications to the unit to change the sound to their liking. In later years, TS9s were assembled with a wide variety of op-amps, instead of the sought-after JRC As well, Tamura added a simple but effective post-distortion equalization circuit with a first-order high-pass shelving filter that "is linearly dependent on its gain", an approach called "progressivity". The Tube Screamer has since spawned many clones and modified versions.
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