Vintage Synth Repair

So I understand that what you're saying is that this is indeed the 
VCA/VCF chip problem and nothing else?

PS. New info: every couple of notes the filter cutoff is slightly lower 
than the other notes I strike. But it's not every sixth note. It's more 
random.

And when in the test mode, the 1st voice (so the LCD shows) is the one 
that always gets stuck on. And here the problem manifests itself 
exactly every six notes. I guess I need to replace 80017a number one?

cheers


--- In vintagesynthrepair@yahoogroups.com, "gil_we" <gil_we@...> wrote:
>
> Have you checked all the basic things... i.e correct voltages, heated 
> parts, etc ?
> 
> I once fixed a 106 which had a bad VCF/VCA chip. The bad chip heated 
> as hell !