Should also mention:
something else to try is cutting the trace between CN06-2 and R9; this
is the CV from the mod box to the VCO, and it runs very close to a
digital buss that can inject unwanted noise. If cutting this trace (at
BOTH ends) solves the distortion problem, you can solder a wire jumper
between CN06-2 and R9 to restore the mod control without the unwanted noise.
>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]