> So, I finally have found it.
>
>
> First, I could not find new CA3083 chips to replace the suspected ones. They say, that they are not manufactured anymore,
> which could be a big problem, for a lot of modules use these.
>
>
> But than after a while, I came with the idea to use the suspected CA3083 chips on the A-143-9 QLFO.
> The results were, that all these chips were working fine on the QLFO.
> Than I replace the four suspected TL084 chips with new ones, and find out that two of them were broken. These two chips
> were the closest to the damaged potmeter.
>
>
> So, you got it right, Dieter.
> Thanks,
>
>
> Ben

I'm glad to hear that the faulty circuits could been discovered. But I'm wondering about your way to test the CA3083. The A-143-9
does not use a CA3083 !

Best wishes
Dieter Doepfer