The eternal debate rages on through time, space and internet forums ... "Which is the best Tubescreamer?" "Do they all sound the same?" "But XYZ uses this one so it must be the best!?" "My uncle Louix has used his since 1789 and swears by it"
The level headed among us will comment that its all subjective, the engineers among us will take put them on oscilloscopes to fine test the differences. The TS-808 with the JRC4558D was released as part of the Ibanez 800 Series which has many great pedals in the range. Often considered as the quintessential Tubescreamer and used (among others) by SRV could this really be the holy grail?
We say put this up against the other Tubecreamers on TonePedia and decide for yourself as what worked for SRV may not work for you.