Now why didn't I think of that :) I tried swapping all 4 chips from channel 3, No joy though.

I'm guessing channel 3 and 4 chips are identical !

Jonathan

--- In Doepfer_a100@yahoogroups.com , Florian Anwander <fanwander@...> wrote:
>
> Hello
>
> if the chips are socketed, try swapping the chips of pcb 4 with other
> pcbs. I suspect 555 to be dead. TL082 usually survive wrong powersupply
> at 12V.
>
> Florian
>