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Re: Bit One Repair - filter chips interchangable?

2006-08-22 by dammerx

Many thanks! Not muddy at all.

--- In crumar@yahoogroups.com, Steve Ridley <spr@...> wrote:
>
> 
> > I'm a huge fan of the SSM filter sound, but have a CEM filter Bit01
> > (the rack). 
> 
> There are more than one SSM filter sounds.  The SSM244 will not sound
> the same as same as the SSM2040 (early Prophet V) or SSM2045.  The 2044
> in the early Bit 1 is a sort of folded up Moog ladder but with it's own
> distinctive sound, the 2045 is more like a Curtis filter and the 2040 
> isn't much like anything else.  Similarly, different CEM filters have
> different sounds - CEM3020/3028 sound fifferent to a CEM3350 or CEM3089.
> 
> Look here for technical data on different filter chips:
> 
> http://www.synthtech.com/cem/cemsynth.html (scroll down)
> 
> and here for what filter chip is in what synth:
> 
> http://www.synthtech.com/cem/cemsynth.html
>  
> > I was wondering: could I simply pull out the CEM filters
> > and replace them with SSMs?
> 
> Only if you like silence and smoke.  Different type of chip,
> different connections on different pins.  It wouldn't work
> and it would probably be an expensive experiment.
> 
> You need to buy an early Bit 1, or maybe a Siel Opera 6 / DK600
> if you want the SSM2044 sound, or see the links above if you want
> the SSM2040 sound.
> 
> > And yes, I'm completely ignorant of electronics. just a musician...
> 
> Nothing wrong with that.  It's people who _think_ they know about
> electronics that worry me...
> 
> Does anyone know the serial number where the Bit 1 changes from SSM 
> to CEM?  My Bit 1 is SSM and has a number in the 240s I think (must
check). 
> 
> Does that help, or have I just muddied the water?
> 
> Steve
>

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