I was switching some pedals around in my line and I have a powerbrick that supplies both 9 and 18 volt outputs . I accidently plugged an 18 volt cable into the tubescreamer and now it just barely has an output . can anyone tell me if this can be fixed????

Open it up and start looking for burnt stuff. I just repaired a RT 66 that someone did that to, and it was a burnt resistor right at the dc power input.

Most likely you burnt a cap.

hi all..
am new in the forum. I have a similar problem as jimmyd..my TS808 just failed on me even with a correct DC supply. It switched on ut has a hum when i kick it in. Can you help me out?
Thank you.