First place to look is the VCO Mod output from the CPU board to the
voice board (CN05 -12).
This should be a smooth voltage; distortion here will be reflected in
the VCO sound.
Possible causes are faulty 4051 CV demux, faulty 4558 opamp buffer,
faulty filtering cap, etc.
It should be easy to track down, following the control signal path with
a scope.
~G
Kenneth Abildgaard wrote:
>
>
> And thanks for having me J
>
> I recently acquired a Polysix in very nice cosmetic condition but it
> has an
> issue with it's sound.
>
> I bought it knowing this but maybe someone here can help me finding
> out what
> to look for as it is quite an annoying problem.
>
> Take a listen here:
>
> http://12bit.com/Audio/Polysix/Polysix.mp3
>
> It is a clean saw wave playing the first sound and it does not matter if I
> turn any MG/LFO knobs. It just sounds like there is always this very fast
> LFO running on the VCO.
>
> Anyone ever heard of this and know what to look for ?
>
> Best;
>
> Kenneth
>
> 12bit.com
>
> [Non-text portions of this message have been removed]
>
>
[Non-text portions of this message have been removed]