AW: AW: ms 10 filter

[Haible Juergen]

Over the years, Korg have built very different versions of the same filter
topology.
Aparently they tried what ever they could find as VC resistor elements,
Vactrols
(PE-1000), Diodes (MS-50), Transistors (MS and PS range), OTAs (2nd rev.
MS-20)
and maybe more.
The only other manufacturer that comes to mind for doing a similar thing was
Wurlitzer for the tremolo in their electric pianos.

JH.

> ----------
> Von: 	WeAreAs1 at aol.com[SMTP:WeAreAs1 at aol.com]
> Gesendet: 	Samstag, 20. März 1999 20:55
> An: 	jhaible at primus-online.de; dragonser at clara.net;
> synth-diy at mailhost.bpa.nl
> Betreff: 	Re:  AW: ms 10 filter
> 
> Hallo Done-It-Yourselves,
> 
> As has been discussed here recently, the early versions of the MS20 had
> our
> favorite lil' bastard filter chip, the Korg IC35, and the later versions
> used
> the dual LM13600's.  The MS20 schematics show both versions.  The MS10
> schematics show only the IC35 as a low pass filter.   It's unlikely that
> they
> made later versions with LM13600's (they sold a lot more MS20's), but who
> knows?
> 
> One wonders if they switched the LM13600's because the IC35's were just to
> expensive to make (and were needed for all those PS-series polysynths), or
> if
> they thought the LM13600's sounded better?
> 
> I have an MS20 with Korg 35 filters, and I absolutely LOVE the sound.
> Very
> musical and grainy and kind of distorted, and sexy as hell - especially
> the
> high-pass.  I've never had a chance to A/B it with a later LM13600 model,
> but
> I'd be very surprised if it sounded the same.  One of these days I'll
> build
> one of those Korg 35 clone filters and compare it with the real thing, and
> get
> back to everyone with a report.
> 
> Michael Bacich
> 
> In a message dated 3/20/99 7:13:36 AM, you wrote:
> 
> <<>BTW does anyone know if the Korg Ms10 filter is the same as the Korg
> >ms20 filter.
> 
> Yes and No. Obviously it's just one half of the MS-20 filter (the LP
> section).
> But there is more. Different Models of MS-20's had very different filters,
> and
> I don't know if the same is the case with the MS-10. I guess not, but I
> don't
> know for sure.>>
>