AW: VCO-1C

[BJ]

jhaible wrote:
> 
> > Talking about old Korgs, is there any one besides me who like
> > and use the MS20, JX3p VCA design?
> 
> I still think that it's responsible for the rather bad SNR of many Korg
> Synths. I never have made tests on a MS-20 (and here the VCF probably
> contributes a lot of noise, too), but I once replaced the VCA in a
> Mono/Poly with a SSM2020 VCA, and it was a *big* difference.
> No more annoying hiss on low bass notes.

Actually i dont find the MS20 noisy it is in fact rater silent,
but on the other hand the Monopoly is wery noisy, i have owned both.

The one transistor VCA is  used in the JX3P and JX8P and they are
not particular noisy i think!
 
> BTW, there's a 1-transistor and a 2-transistor version of this Korg-VCA,
> and they have very different transfer courves when overdriven.
> (1-transistor version is only clipping one side of the signal)
> 
> Interesting for sure, but you'd rather have the *option* of a low noise
> VCA, at least.

Yes, if one would overdrive the one transistor version at some 
levels one get a sinus wave ot of a triangle wave.

BJ