K5synth

Wow- how did you confirm the VCA's are the noise source? 
Did you replace them with anything else? What VCA's did you use as 
replacements?

I was unable to get the spec sheet for the JRC chips, did you ever 
find it?

I ordered a handful of discountinued VCAs for my OB-X (M3080???) and 
you can still get them.  If you can figure out the pin configuration 
of the current JCR in the K5 (8 pins linear as I recall)I will see if 
they can be mapped to these other M3080 VCAs (that are 4 pins on each 
side so it will require some wiring as the VCAs won't fit correctly).

Do tell more.  





--- In k5synth@yahoogroups.com, Antoine Deschênes <antdes45@...> 
wrote:
>
> Hi,
> 
> I finally started to try a few mods to reduce the noise that the K5 
> produces(that the 56k resistor mod doesn't fix) I can now confirm 
that 
> the VCAs(Voltage Controlled Amplifiers, they get the position from 
the 
> volume slider and amplify/reduce the sound accordingly) are the 
main 
> source of noise. I should start working on an alternative sometime.
> 
> It looks like I'm Burr-Brownizing the K5.
> 
> Cheers,
> Antoine
>