Dating ibanez serial
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.They have a little bit more grit which some people might like.The early TS808 used a circuit board marked MP-D01201A, then in late 1980 or so they changed to the MP-D01201B board.
Many used the Toshiba TA75558 which was continued on the reissue.SRV used the TS-808 for his trademark juicy strat tone.When he used smaller Fender amps that had natural overdrive, he used the TS set clean (low drive setting) with the level up high to push the amp for more distortion (see my CLEAN BOOST info below).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.