Thanks again Andy. The frustration has passed. The conformal coating on the PCB was breaking down and there were a few shorts and spotty connections on the PCB itself. I cleaned it all up and ran a few jumper wires, and now everything works as it should.
--- In PolySix@yahoogroups.com, Andrew Jury <andy@...> wrote:
>
> The intense feeling of wanting to smash the thing will pass when you
> eventually discover the problem, I promise! Have you tried swapping both
> IC32 and 34 from another voice as a pair? Can¹t remember if we tried this?
> Also can you verify that VR9 is still a 1M trimmer and has a range which
> adjusts accordingly. Mark the position of it¹s current setting before you
> start. This pots have a horrible habit of going dead where the wiper sits on
> the carbon track for nearly 30 years!
>
> If I have some spare time (ha!) I¹ll go into the lab and takes some readings
> on one of mine...
>
> Cheers,
> Andy