Discussion about the Korg PolySix synthesizer

Hi Oliver,

 

Do you have or know someone who owns an oscilloscope? I have just downloaded
your files and listened to them. As an example I picked the 'cold' file and
the '180 minute' file. The third phrase into the file you play a nice saw
tooth waveform which is very clean when examined closely. However, the cold
version of the same waveform is superimposed with some terrible noise. When
you run the noise through a spectrum analyser you can see the contents have
equal amplitude throughout the audible range of frequencies. My initial
thoughts were that you might have a problem with the power supply, but you
would then either get audible hum or harmonic noise at either 50/60Hz
intervals down the spectrum. This noise looks and sounds like the kind of
racket generated by digital circuits when they are not decoupled properly.
If you can lay your hand on a scope attach it to the +5V rail on the KLM-367
and see how clean the supply is when cold. Then check the coupling
electrolytics. Others in the group might have their own ideas, but like has
been said, before you do anything else, de-solder the memory backup battery
before it leaks!

 

Cheers,

Andy

 

From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
oseite
Sent: 15 November 2009 16:24
To: PolySix@yahoogroups.com
Subject: [PolySix] Re: Help! My Polysix needs to warm up for 4 hours

 

  

Andy,

you find the file "warming up Polysix.zip" in the "Files" folder.
I recorded some different programs.

cheers

Oliver

--- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , "Andrew
Jury" <andy@...> wrote:
>
> Oliver,
> 
> 
> 
> When you say it 'sounds bad' what do you mean? Out of tune, dysfunctional,
> distorted, etc? It is common for a 'board of this vintage to take around
30
> minutes to 'warm up', but 4 hours? Could be lots of things wrong I can
think
> of. If you can describe how the instrument sounds after say 15 minutes on
> from cold? Perhaps even make a recording and post it. That would be a
great
> help!
> 
> 
> 
> Cheers,
> 
> Andy
> 
> 
> 
> From: PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>
[mailto:PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> ] On
Behalf Of
> oseite
> Sent: 11 November 2009 22:08
> To: PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> 
> Subject: [PolySix] Re: Help! My Polysix needs to warm up for 4 hours
> 
> 
> 
> 
> 
> I think the battery is allright. It looks fine and the saved sounds work
> (after warming up - 4 hours).
> Any other ideas?
> 
> --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>
<mailto:PolySix%40yahoogroups.com> , "Jim"
> <jbgange@> wrote:
> >
> > First open it up and check for battery leakage.
> > 
> > ----- Original Message ----- 
> > From: oseite 
> > To: PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>
<mailto:PolySix%40yahoogroups.com> 
> > Sent: Wednesday, November 11, 2009 4:30 AM
> > Subject: [PolySix] Help! My Polysix needs to warm up for 4 hours
> > 
> > 
> > 
> > Hello,
> > 
> > I did not use my Poly6 for some years. When I want to use the Poly6 now,
I
> have to turn the power on and wait for about 4 hours. The Polysix has to
> "warm up" otherwise the sound is bad.
> > How can I repair it?
> > 
> > Thanks
> > 
> > Oliver
> > 
> > 
> > 
> > 
> > 
> > [Non-text portions of this message have been removed]
> >
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>





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