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The main change in the TS-9 circuit is in the output section.This caused the tube screamer to be a bit brighter and less "smooth".The most popular was the TS-9 tube screamer, which is almost the same as the TS-808 internally.Externally the on/off switch grew to fill about 1/3 of the effect.The TS-808 and its generation have small square metal on/off touch-buttons. There were some TS-808s made in the 1979 period, mostly for other than USA markets, that came in a narrower box.These have a bottom plate that unscrews to change the battery like an MXR pedal, no plastic battery cover. It uses two 1458 chips which are the 1st version of the low-tech dual op-amp.
The overdrive and OD-II had a different, much more distorted, fuzzy circuit close to a Big Muff.The first Tube Screamer was the green TS-808 overdrive pro in the late '70s.It was preceded by the Orange "Overdrive" and green "Overdrive-II" which came in narrower boxes without the battery cover, and the reddish "Overdrive-II" which had a box very similar to the TS-808.As you can see, the JRC chip was used throughout the life of the TS-808 and the TL4558P was used sometimes.In AB tests, there is VERY little difference between the three chips, although the JRC gives the strongest CLASSIC tube screamer sound- the sweet vocal midrange.