Dating vintage ibanez pedals
The Malaysian RC4558P chip was probably used to save some money as they were cheaper than a Japanese made JRC chip.We would be glad to use the RC chip in your mod if you would like.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.
It used the same case as the earlier OVERDRIVE and OVERDRIVE-II pedals which used stomp switches. This board can also be found in some old Maxon OD-808 OVERDRIVE pedals which had a TS808 style switch and a power jack on the side (not to be confused with the 2000-era Maxon OD808).
The Edge from U2 uses a TS9 for most of his overdrive tones, as do countless other famous rock and blues players.
In later years the TS-9s were put together with other op-amp chips, instead of the JRC-4558 which is called for in the schematics.
Some of these sound BAD, especially the JRC 2043DD chips.
Many used the Toshiba TA75558 which was continued on the reissue.