Discussion about the Korg PolySix synthesizer

I just got a polysix and I must say it's a beautiful sounding synth, 
much on the bass side ! I like it being able to make especially great 
piano/organ/bass, which quite complements my Kawai SX-210 which is 
not strong enough on the organ/piano type of sounds.

The first thing I noticed is that is was way out of tune, so I had a 
little search here and found the great instruction page someone has 
posted here and had it tuned.

Next is replacing the battery and the power supply capacitors.

My question is if by any way replacing the two large capacitors on 
the powersupply (2200uF and 4700uF) can change the voltages in the 
circuit and make it out of tune in any way ?.... I;m afraid that 
voltage changes will make some VR's set diffenrent values making all 
type of tunings changed.

Thanks

At 11:59 AM 2/6/04 +0000, you wrote:
>My question is if by any way replacing the two large capacitors on
>the powersupply (2200uF and 4700uF) can change the voltages in the
>circuit and make it out of tune in any way ?.... I;m afraid that
>voltage changes will make some VR's set diffenrent values making all
>type of tunings changed.
>
>Thanks

Replacing the filter caps in the power supply should not cause any change 
in the voltage output -- but if it does, the powersupply trims are easy 
(I'm assuming you have a meter & know how to use it).
Just be careful, working with the power supply;  use caps of the same value 
with the same or higher voltage rating, watch out for the polarity, and 
check the power supply output before you plug in the CPU & Audio boards.

~GMM

[Non-text portions of this message have been removed]

Thanks, 

done that as well as replacing the battery and all works fine !

BTW, I noticed the sign "(M)" on both large original power supply 
capacitors, but replaced with ones that doesn't have that sign on 
them, is it OK ? I know that the "M" signs mean 20% tolerance ...


--- In PolySix@yahoogroups.com, greg montalbano 
<greg.montalbano@u...> wrote:
> At 11:59 AM 2/6/04 +0000, you wrote:
> >My question is if by any way replacing the two large capacitors on
> >the powersupply (2200uF and 4700uF) can change the voltages in the
> >circuit and make it out of tune in any way ?.... I;m afraid that
> >voltage changes will make some VR's set diffenrent values making 
all
> >type of tunings changed.
> >
> >Thanks
> 
> Replacing the filter caps in the power supply should not cause any 
change 
> in the voltage output -- but if it does, the powersupply trims are 
easy 
> (I'm assuming you have a meter & know how to use it).
> Just be careful, working with the power supply;  use caps of the 
same value 
> with the same or higher voltage rating, watch out for the polarity, 
and 
> check the power supply output before you plug in the CPU & Audio 
boards.

> 
> ~GMM
> 
> [Non-text portions of this message have been removed]

Shouldn't be a problem;  newer caps are generally better quality (and 
smaller!) than the ones made 20-30 years ago.

~GMM

At 05:20 PM 2/6/04 +0000, you wrote:
>Thanks,
>
>done that as well as replacing the battery and all works fine !
>
>BTW, I noticed the sign "(M)" on both large original power supply
>capacitors, but replaced with ones that doesn't have that sign on
>them, is it OK ? I know that the "M" signs mean 20% tolerance ...
>
>
>--- In PolySix@yahoogroups.com, greg montalbano
><greg.montalbano@u...> wrote:
> > At 11:59 AM 2/6/04 +0000, you wrote:
> > >My question is if by any way replacing the two large capacitors on
> > >the powersupply (2200uF and 4700uF) can change the voltages in the
> > >circuit and make it out of tune in any way ?.... I;m afraid that
> > >voltage changes will make some VR's set diffenrent values making
>all
> > >type of tunings changed.
> > >
> > >Thanks
> >
> > Replacing the filter caps in the power supply should not cause any
>change
> > in the voltage output -- but if it does, the powersupply trims are
>easy
> > (I'm assuming you have a meter & know how to use it).
> > Just be careful, working with the power supply;  use caps of the
>same value
> > with the same or higher voltage rating, watch out for the polarity,
>and
> > check the power supply output before you plug in the CPU & Audio
>boards.
> >
> > ~GMM
> >
> > [Non-text portions of this message have been removed]
>
>
>
>PolySix "Digiest" Page: 
><http://www.acc.umu.se/~amber/Poly6>http://www.acc.umu.se/~amber/Poly6
>
>
>
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[Non-text portions of this message have been removed]