I recently acquired an Ibanez TS9 Tubescreamer.
Unfortunately all it does is make tons of static, whether it is engaged or not. I've used multiple cables, multiple power supplies, known good 9v battery.
The power light does come on when you depress the switch, but it is not passing the guitar signal through. Just a lot of noise.
I've opened it up and there is not anything obvious.
It could be just junk, but I'd like to be able to get it working.