Yamaha CS80

Hi Scott, if you're looking in... would there be anything else on the SM1 board that could cause lack of 'resonance'?

I have been looking around the filter EG but on the schematic that doesn't seem to tie in with resonance, just the filter frequency. Or am I mistaken and it could via the internal components in the potted module?

Cheers,
TOM




--- In yamahacs80@yahoogroups.com, The Old Crow <oldcrow@...> wrote:
>
>    What range of voltage do you get going into the res CV pin on the 
> NE10400 from that slider?
> 
> Crow
> /**/
> 
> On 11/23/2011 11:10 AM, Quazimodo wrote:
> > Hi guys,
> >
> > I have a question about the CSY-1 transplant I am finishing off. I've been meaning to finally put the lid on this for a year or so now... so I've revisited it. I 'extracted' the synth part from an old CSY-1 organ amd made a cabinet for it so what I have here is basically a three and a half octave SY-1.
> >
> > It's all working great considering what it has been through...!
> >
> > Apart that is, from one thing. The filter resonance slider doesn't seem to do much. It does affect the sound but only with an apparent slight volume level difference when I move the control. The frequency slider works fine.
> >
> > My question is - is this most likely to be the potted low pass VFC unit? On the schematic there doesn't seem a lot around there... just some resistors and one cap, a 4.7mfd which I have change, but it made no difference. Are there any parts of the circuit other than the potted assembly, that I could look at regarding lack of resonance..?
> >
> > Any help/pointers much appreciated.
> > Cheers,
> > TOM
> >
>