I'm sure 11 Gauge will respond with 'the truth' but I think I have read that while the two are very similar, that the TS-9 is (was) basically a 'modded by Ibanez' TS-808 to sound better with transistor amps (perhaps the addition of a few components), not to be used exclusively by SS amps but just to sound better as they were very popular (or at least a lot of production) in the late '80's. I have owned a TS-9's before, never a TS-808 and hear that the 808 is smoother/warmer not as much Treble, and the TS-9 a little grainier/more aggressive?? This could all be my recurring hallucinations!

Will defer to folks with facts! There's only THREE real differences that will make any true tonal difference (that anyone with even fair hearing can differentiate): 1. Two resistors on the pedal's output that drive the amp a bit harder with the 808 versus the 9. This is known as the 'brown mod,' and can be done quickly and cheaply to any TS or TS clone.

Two clipping diodes that have a slightly larger 'threshold' than the standard silicon types that are used in over 90% of all diode clipper pedals (that are mass produced). They allow the 808 to have a bit more 'air,' volume, etc. Some folks describe it as warmth versus a little more compression/congestion with the TS9 (and 99% of TS clones). These 'special NOS diodes' can also be duplicated by using slightly different ones than in the TS9, so that it's not an expensive/exclusive/unobtanium sort of thing. The op amp chip only if your TS9 has anything other than a 4558 variant.

Tube Screamer Family. Here are some Ibanez pedals. The TS808s are seen in the middle. You can see one of the Narrow Euro TS-808 pedals, it's the leftmost of the TS-808s. The top row center 4 knob pedals are the ST9 Super Tube Screamers. At the top left are a pair of TS-10 pedals.

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Some will swear that 4558's differ, or there are 'NOS 4558's), but that is utter BS. Maxon/Ibanez chose that chip because it was stupid cheap.

Any different ones in the 808's were simply where Ibanez was procuring the cheapest stock at the time. It doesn't matter if it's the TI chip, the Malaysian RC, or whatever.

The newer 'DD' chips are the same, just have a better noise floor. The NJM and JRC chips are one in the same, since NJM bought the factory and machines. If you pull up the data sheet for ALL 4558 incarnations, you will find that the integrated circuit within it is identical - there is no way for it to sound different, and there is no 'premium factory' making those things. So back to number 3 (sorry for the rant - lots of people get taken for a ride paying for a 'NOS 4558') - there were some older TS9's that had a non-4558 chip, and it just isn't a good one for creating distortion.

That is the entire key behind the op amp in the TS - it is BAD for hi fi purposes. So it's really just TWO differences (or 4 parts that cost a nickel each!) in many/most TS9's and any TS clone that copies the TS9 and not the 808 (a few newer ones do indeed copy the latter). Click to expand.Again, spot on!

This is the TWO DIODES that differ in the two pedals. The 9's diodes have a smaller 'threshold,' which allows for more compression and bite, since it was all intended to come from the pedal. The 808's larger threshold from its diodes gives the perception of less distortion, and a smoother sound. The worst of the 9's have the trifecta - non-4558 chip, output resistors for a solid state amp, and clipping diodes for a solid state amp. But the chip itself has nothing to do with the other 'standard' differences. Click to expand.Anything that will match the Fv of the diodes used in the 808, which was a MA150. The 1N4148 has a Fv (forward voltage) of around 650mV.

The MA150 had a Fv of around 900mV.The easiest thing to do is either run a diode in series with the stock TS9 diode to give you ~900mV, provided you can find one that will do that. Easier to do is combine something like a 1N4001 with a 1N34A or BAT41 (a.k.a. 'Zendrive diode'). Just take any cheap multimeter that will measure diodes, and temporarily string them together to match what the MA150 gave as the Fv. There's no magic to the voltage that a diode switches on at, at least in the case of the 808. It's a similar situation with the old MIJ DS-1's, and why people prefer the way they sound. In the case of that pedal, it is almost ALL diodes, and none of the chip swap stuff or anything else that people do (the DS-1 distorts too much for the other parts to have a profound effect).