Ibanez ST-9 Super Tube Screamer with 2x JRC4558D op amps1984 s/n 420862 Japan in very good condition. Thoroughly tested and in perfect working order.

The Ibanez ST-9 is actually an Ibanez TS-9 on steroïds,  the final culmination of the Ibanez Tubescreamer family thusfar.
The sound is similar to the TS9, but delivering more sustain and drive.
It has two JRC4558D IC chips instead of one, as on the TS9.
A fourth pot for Mid Boost is introduced to improve tonality control.
Briefly available exclusively in Europe it is utterly rare.

Quote AnalogMan ;
The rare and valuable ST-9 Super Tube Screamer which seems to have been sold only in Europe.