Discussion about the Korg PolySix synthesizer

Well, remember that what he's talking about is *HIS* version of the
KLM-367, the CrowLM-367.

While his substitutions might be the perfect thing to do, I wouldn't
really know.  Replacing the ripple caps with bigger values should
help.  I still stand by my suggestion to replace all Power Supply caps
with new ones.  You'll get the most bang for your buck there.

On Tue, Jun 10, 2008 at 10:36 AM, n0disc0 <n0disc0@yahoo.com> wrote:
> But Oldcrow seems to talk about the KLM-367 especially :
>
> See : (3rd paragraph)
>
> http://www.oldcrows.net/~oldcrow/synth/korg/polysix/crowlm367/
>
> I've also found useful informations on his site about the capacitors,
> which confirm yours :
>
>
> Tip #2 -- Replacing Old Capacitors
>
> There are two types of parts to avoid, however : mylar capacitors and
> tantalum capacitors.  There are an abundance of these two capacitor
> types in old synthesizers, and they should be replaced first
> among all the other capacitors.  Replace mylar capacitors with
> polystyrene or polypropylene capacitors.  Use polypropylene capacitors
> in the most tolerance-critical areas : oscillator timing capacitors,
> tuned filter capacitive elements, and so on.  Polystyrene capacitors
> can be used most everywhere else for things such as replacement S/H
> hold capacitors, op-amp circuitry, etc.
>
> For places where tantalum polarized capacitors were used (The
> Prophet-5 had lots of these), replace them with aluminum electrolytic
> parts of the same value.  Tantalum capacitors have a very low WVDC and
> are the first parts to die if voltage spikes make it past the power
> supply defeneses. In general, replace old aluminum electrolytics with
> new ones.  Modern capacitor manufacturing techniques have yielded much
> better parts, so take advantage of this. For power supply decoupling
> on circuit boards, replace the usually 0.1uF ceramic disc capacitors
> with monolithic dipped-ceramic parts.  Do the same for other values of
> decoupling capacitors in the circuit.
>
> Lastly--and importantly--replace the filter capacitors in the power
> supply. These take a lot of abuse from the AC main line and should be
> replaced at least once in the life of a synthesizer.
>
>
> ------------------------------------
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6Yahoo! Groups Links
>
>
>
>



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-Chromatest J. Pantsmaker
http://www.chromatest.net