Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer

anyone ?

--- In PolySix@yahoogroups.com, "gil_we" <gil_we@y...> wrote:
>
> I wonder if anyone would have any idea about the following
problem...
> It's a friend's Polysix we both recovered from battery leakage a
year
> ago, and left it untuned after we experienced some problem tuning
it.
> Now we got back into it and we realized that on the tuning circuit
> KLM-366 new production):
>
> VR2 - just doesn't make any change to the tuning... (the resistor
> itself is ok)
> VR1 - When adjusting it the pitch will drop or raise the first
second
> but than will slowly get back to the initial pitch before changing
> its setting !
> The VR determing the D#4 to E4 gap seems to barely make any
effect...
>
> All other VRs (Mid tune, VR3 low tuner, VR10/11 on all vco's) seems
> to work, but strangly VR15 makes change to the sound but not to
pitch
> (I understand it is also a kind of mid-tuner).
>
> We replaced both 4051 in the tuning circuit and the two 072 and it
> didn't make any change... Well, actually, after replacing IC39 the
> low tuning started to work more or less ok (it is tuned more or less
> at the lower octaves but not at all at the higher octaves...)
>
> I wonder if anyone has any idea what could cause it ...
>
> Thanks all.
>